[llvm] bdf6ba2 - [FPEnv][InstSimplify] Precommit tests: Enable more folds for constrained fsub
Kevin P. Neal via llvm-commits
llvm-commits at lists.llvm.org
Tue Oct 12 10:47:54 PDT 2021
Author: Kevin P. Neal
Date: 2021-10-12T13:47:28-04:00
New Revision: bdf6ba2d30a01f3b01d499558a0753a3e9c4b019
URL: https://github.com/llvm/llvm-project/commit/bdf6ba2d30a01f3b01d499558a0753a3e9c4b019
DIFF: https://github.com/llvm/llvm-project/commit/bdf6ba2d30a01f3b01d499558a0753a3e9c4b019.diff
LOG: [FPEnv][InstSimplify] Precommit tests: Enable more folds for constrained fsub
Precommit tests for D107285 as requested. TODO notes left at individual
functions also as requested.
Added:
llvm/test/Transforms/InstSimplify/strictfp-fsub.ll
Modified:
Removed:
################################################################################
diff --git a/llvm/test/Transforms/InstSimplify/strictfp-fsub.ll b/llvm/test/Transforms/InstSimplify/strictfp-fsub.ll
new file mode 100644
index 0000000000000..5db5310544918
--- /dev/null
+++ b/llvm/test/Transforms/InstSimplify/strictfp-fsub.ll
@@ -0,0 +1,705 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt < %s -instsimplify -S | FileCheck %s
+
+;
+; constrained fsub
+;
+
+;
+; fsub X, +0 ==> X
+;
+
+define float @fsub_x_p0_defaultenv(float %a) #0 {
+; CHECK-LABEL: @fsub_x_p0_defaultenv(
+; CHECK-NEXT: ret float [[A:%.*]]
+;
+ %ret = call float @llvm.experimental.constrained.fsub.f32(float %a, float 0.0, metadata !"round.tonearest", metadata !"fpexcept.ignore") #0
+ ret float %ret
+}
+
+; Missing nnan: must not fire.
+define float @fsub_x_p0_ebmaytrap(float %a) #0 {
+; CHECK-LABEL: @fsub_x_p0_ebmaytrap(
+; CHECK-NEXT: [[RET:%.*]] = call float @llvm.experimental.constrained.fsub.f32(float [[A:%.*]], float 0.000000e+00, metadata !"round.tonearest", metadata !"fpexcept.maytrap") #[[ATTR0:[0-9]+]]
+; CHECK-NEXT: ret float [[RET]]
+;
+ %ret = call float @llvm.experimental.constrained.fsub.f32(float %a, float 0.0, metadata !"round.tonearest", metadata !"fpexcept.maytrap") #0
+ ret float %ret
+}
+
+; TODO: This will fold if we allow non-default floating point environments.
+define float @fsub_nnan_x_p0_ebmaytrap(float %a) #0 {
+; CHECK-LABEL: @fsub_nnan_x_p0_ebmaytrap(
+; CHECK-NEXT: [[RET:%.*]] = call nnan float @llvm.experimental.constrained.fsub.f32(float [[A:%.*]], float 0.000000e+00, metadata !"round.tonearest", metadata !"fpexcept.maytrap") #[[ATTR0]]
+; CHECK-NEXT: ret float [[RET]]
+;
+ %ret = call nnan float @llvm.experimental.constrained.fsub.f32(float %a, float 0.0, metadata !"round.tonearest", metadata !"fpexcept.maytrap") #0
+ ret float %ret
+}
+
+; Missing nnan: must not fire.
+define float @fsub_x_p0_ebstrict(float %a) #0 {
+; CHECK-LABEL: @fsub_x_p0_ebstrict(
+; CHECK-NEXT: [[RET:%.*]] = call float @llvm.experimental.constrained.fsub.f32(float [[A:%.*]], float 0.000000e+00, metadata !"round.tonearest", metadata !"fpexcept.strict") #[[ATTR0]]
+; CHECK-NEXT: ret float [[RET]]
+;
+ %ret = call float @llvm.experimental.constrained.fsub.f32(float %a, float 0.0, metadata !"round.tonearest", metadata !"fpexcept.strict") #0
+ ret float %ret
+}
+
+; TODO: This will fold if we allow non-default floating point environments.
+; TODO: The instruction is expected to remain, but the result isn't used.
+define float @fsub_nnan_x_p0_ebstrict(float %a) #0 {
+; CHECK-LABEL: @fsub_nnan_x_p0_ebstrict(
+; CHECK-NEXT: [[RET:%.*]] = call nnan float @llvm.experimental.constrained.fsub.f32(float [[A:%.*]], float 0.000000e+00, metadata !"round.tonearest", metadata !"fpexcept.strict") #[[ATTR0]]
+; CHECK-NEXT: ret float [[RET]]
+;
+ %ret = call nnan float @llvm.experimental.constrained.fsub.f32(float %a, float 0.0, metadata !"round.tonearest", metadata !"fpexcept.strict") #0
+ ret float %ret
+}
+
+; Test with a fast math flag set but that flag is not "nnan".
+define float @fsub_ninf_x_p0_ebstrict(float %a) #0 {
+; CHECK-LABEL: @fsub_ninf_x_p0_ebstrict(
+; CHECK-NEXT: [[RET:%.*]] = call ninf float @llvm.experimental.constrained.fsub.f32(float [[A:%.*]], float 0.000000e+00, metadata !"round.tonearest", metadata !"fpexcept.strict") #[[ATTR0]]
+; CHECK-NEXT: ret float [[RET]]
+;
+ %ret = call ninf float @llvm.experimental.constrained.fsub.f32(float %a, float 0.0, metadata !"round.tonearest", metadata !"fpexcept.strict") #0
+ ret float %ret
+}
+
+;
+; fsub X, -0 ==> X, when we know X is not -0
+; (fast math flag: nsz)
+;
+
+define float @fold_fsub_nsz_x_n0_defaultenv(float %a) #0 {
+; CHECK-LABEL: @fold_fsub_nsz_x_n0_defaultenv(
+; CHECK-NEXT: ret float [[A:%.*]]
+;
+ %sub = call nsz float @llvm.experimental.constrained.fsub.f32(float %a, float -0.0, metadata !"round.tonearest", metadata !"fpexcept.ignore") #0
+ ret float %sub
+}
+
+; Missing nnan: must not fire.
+define float @fold_fsub_nsz_x_n0_ebmaytrap(float %a) #0 {
+; CHECK-LABEL: @fold_fsub_nsz_x_n0_ebmaytrap(
+; CHECK-NEXT: [[SUB:%.*]] = call nsz float @llvm.experimental.constrained.fsub.f32(float [[A:%.*]], float -0.000000e+00, metadata !"round.tonearest", metadata !"fpexcept.maytrap") #[[ATTR0]]
+; CHECK-NEXT: ret float [[SUB]]
+;
+ %sub = call nsz float @llvm.experimental.constrained.fsub.f32(float %a, float -0.0, metadata !"round.tonearest", metadata !"fpexcept.maytrap") #0
+ ret float %sub
+}
+
+; TODO: This will fold if we allow non-default floating point environments.
+define float @fold_fsub_nnan_nsz_x_n0_ebmaytrap(float %a) #0 {
+; CHECK-LABEL: @fold_fsub_nnan_nsz_x_n0_ebmaytrap(
+; CHECK-NEXT: [[SUB:%.*]] = call nnan nsz float @llvm.experimental.constrained.fsub.f32(float [[A:%.*]], float -0.000000e+00, metadata !"round.tonearest", metadata !"fpexcept.maytrap") #[[ATTR0]]
+; CHECK-NEXT: ret float [[SUB]]
+;
+ %sub = call nnan nsz float @llvm.experimental.constrained.fsub.f32(float %a, float -0.0, metadata !"round.tonearest", metadata !"fpexcept.maytrap") #0
+ ret float %sub
+}
+
+; Missing nnan: must not fire.
+define float @fold_fsub_nsz_x_n0_ebstrict(float %a) #0 {
+; CHECK-LABEL: @fold_fsub_nsz_x_n0_ebstrict(
+; CHECK-NEXT: [[SUB:%.*]] = call nsz float @llvm.experimental.constrained.fsub.f32(float [[A:%.*]], float -0.000000e+00, metadata !"round.tonearest", metadata !"fpexcept.strict") #[[ATTR0]]
+; CHECK-NEXT: ret float [[SUB]]
+;
+ %sub = call nsz float @llvm.experimental.constrained.fsub.f32(float %a, float -0.0, metadata !"round.tonearest", metadata !"fpexcept.strict") #0
+ ret float %sub
+}
+
+; TODO: This will fold if we allow non-default floating point environments.
+; TODO: The instruction is expected to remain, but the result isn't used.
+define float @fold_fsub_nsz_nnan_x_n0_ebstrict(float %a) #0 {
+; CHECK-LABEL: @fold_fsub_nsz_nnan_x_n0_ebstrict(
+; CHECK-NEXT: [[SUB:%.*]] = call nnan nsz float @llvm.experimental.constrained.fsub.f32(float [[A:%.*]], float -0.000000e+00, metadata !"round.tonearest", metadata !"fpexcept.strict") #[[ATTR0]]
+; CHECK-NEXT: ret float [[SUB]]
+;
+ %sub = call nsz nnan float @llvm.experimental.constrained.fsub.f32(float %a, float -0.0, metadata !"round.tonearest", metadata !"fpexcept.strict") #0
+ ret float %sub
+}
+
+;
+; fsub X, -0 ==> X, when we know X is not -0
+; (No "nsz" flags)
+;
+
+define float @fold_fsub_fabs_x_n0_defaultenv(float %a) #0 {
+; CHECK-LABEL: @fold_fsub_fabs_x_n0_defaultenv(
+; CHECK-NEXT: [[ABSA:%.*]] = call float @llvm.fabs.f32(float [[A:%.*]])
+; CHECK-NEXT: ret float [[ABSA]]
+;
+ %absa = call float @llvm.fabs.f32(float %a)
+ %sub = call float @llvm.experimental.constrained.fsub.f32(float %absa, float -0.0, metadata !"round.tonearest", metadata !"fpexcept.ignore") #0
+ ret float %sub
+}
+
+; Missing nnan: must not fire.
+define float @fold_fsub_fabs_x_n0_ebmaytrap(float %a) #0 {
+; CHECK-LABEL: @fold_fsub_fabs_x_n0_ebmaytrap(
+; CHECK-NEXT: [[ABSA:%.*]] = call float @llvm.fabs.f32(float [[A:%.*]])
+; CHECK-NEXT: [[SUB:%.*]] = call float @llvm.experimental.constrained.fsub.f32(float [[ABSA]], float -0.000000e+00, metadata !"round.tonearest", metadata !"fpexcept.maytrap") #[[ATTR0]]
+; CHECK-NEXT: ret float [[SUB]]
+;
+ %absa = call float @llvm.fabs.f32(float %a)
+ %sub = call float @llvm.experimental.constrained.fsub.f32(float %absa, float -0.0, metadata !"round.tonearest", metadata !"fpexcept.maytrap") #0
+ ret float %sub
+}
+
+; TODO: This will fold if we allow non-default floating point environments.
+define float @fold_fsub_fabs_nnan_x_n0_ebmaytrap(float %a) #0 {
+; CHECK-LABEL: @fold_fsub_fabs_nnan_x_n0_ebmaytrap(
+; CHECK-NEXT: [[ABSA:%.*]] = call float @llvm.fabs.f32(float [[A:%.*]])
+; CHECK-NEXT: [[SUB:%.*]] = call nnan float @llvm.experimental.constrained.fsub.f32(float [[ABSA]], float -0.000000e+00, metadata !"round.tonearest", metadata !"fpexcept.maytrap") #[[ATTR0]]
+; CHECK-NEXT: ret float [[SUB]]
+;
+ %absa = call float @llvm.fabs.f32(float %a)
+ %sub = call nnan float @llvm.experimental.constrained.fsub.f32(float %absa, float -0.0, metadata !"round.tonearest", metadata !"fpexcept.maytrap") #0
+ ret float %sub
+}
+
+; Missing nnan: must not fire.
+define float @fold_fsub_fabs_x_n0_ebstrict(float %a) #0 {
+; CHECK-LABEL: @fold_fsub_fabs_x_n0_ebstrict(
+; CHECK-NEXT: [[ABSA:%.*]] = call float @llvm.fabs.f32(float [[A:%.*]])
+; CHECK-NEXT: [[SUB:%.*]] = call float @llvm.experimental.constrained.fsub.f32(float [[ABSA]], float -0.000000e+00, metadata !"round.tonearest", metadata !"fpexcept.strict") #[[ATTR0]]
+; CHECK-NEXT: ret float [[SUB]]
+;
+ %absa = call float @llvm.fabs.f32(float %a)
+ %sub = call float @llvm.experimental.constrained.fsub.f32(float %absa, float -0.0, metadata !"round.tonearest", metadata !"fpexcept.strict") #0
+ ret float %sub
+}
+
+; TODO: This will fold if we allow non-default floating point environments.
+; TODO: The instruction is expected to remain, but the result isn't used.
+define float @fold_fsub_fabs_nnan_x_n0_ebstrict(float %a) #0 {
+; CHECK-LABEL: @fold_fsub_fabs_nnan_x_n0_ebstrict(
+; CHECK-NEXT: [[ABSA:%.*]] = call float @llvm.fabs.f32(float [[A:%.*]])
+; CHECK-NEXT: [[SUB:%.*]] = call nnan float @llvm.experimental.constrained.fsub.f32(float [[ABSA]], float -0.000000e+00, metadata !"round.tonearest", metadata !"fpexcept.strict") #[[ATTR0]]
+; CHECK-NEXT: ret float [[SUB]]
+;
+ %absa = call float @llvm.fabs.f32(float %a)
+ %sub = call nnan float @llvm.experimental.constrained.fsub.f32(float %absa, float -0.0, metadata !"round.tonearest", metadata !"fpexcept.strict") #0
+ ret float %sub
+}
+
+; TODO: This can't fire currently due to missing constrained support:
+define float @fold_fsub_sitofp_x_n0_defaultenv(i32 %a) #0 {
+; CHECK-LABEL: @fold_fsub_sitofp_x_n0_defaultenv(
+; CHECK-NEXT: [[FPA:%.*]] = call float @llvm.experimental.constrained.sitofp.f32.i32(i32 [[A:%.*]], metadata !"round.tonearest", metadata !"fpexcept.ignore") #[[ATTR0]]
+; CHECK-NEXT: [[SUB:%.*]] = call float @llvm.experimental.constrained.fsub.f32(float [[FPA]], float -0.000000e+00, metadata !"round.tonearest", metadata !"fpexcept.ignore") #[[ATTR0]]
+; CHECK-NEXT: ret float [[SUB]]
+;
+ %fpa = call float @llvm.experimental.constrained.sitofp.f32.i32(i32 %a, metadata !"round.tonearest", metadata !"fpexcept.ignore") #0
+ %sub = call float @llvm.experimental.constrained.fsub.f32(float %fpa, float -0.0, metadata !"round.tonearest", metadata !"fpexcept.ignore") #0
+ ret float %sub
+}
+
+;
+; fsub -0.0, (fneg X) ==> X
+;
+
+define float @fsub_fneg_n0_fnX_defaultenv(float %a) #0 {
+; CHECK-LABEL: @fsub_fneg_n0_fnX_defaultenv(
+; CHECK-NEXT: ret float [[A:%.*]]
+;
+ %nega = fneg float %a
+ %ret = call float @llvm.experimental.constrained.fsub.f32(float -0.0, float %nega, metadata !"round.tonearest", metadata !"fpexcept.ignore") #0
+ ret float %ret
+}
+
+; Missing nnan: must not fire.
+define float @fsub_fneg_n0_fnX_ebmaytrap(float %a) #0 {
+; CHECK-LABEL: @fsub_fneg_n0_fnX_ebmaytrap(
+; CHECK-NEXT: [[NEGA:%.*]] = fneg float [[A:%.*]]
+; CHECK-NEXT: [[RET:%.*]] = call float @llvm.experimental.constrained.fsub.f32(float -0.000000e+00, float [[NEGA]], metadata !"round.tonearest", metadata !"fpexcept.maytrap") #[[ATTR0]]
+; CHECK-NEXT: ret float [[RET]]
+;
+ %nega = fneg float %a
+ %ret = call float @llvm.experimental.constrained.fsub.f32(float -0.0, float %nega, metadata !"round.tonearest", metadata !"fpexcept.maytrap") #0
+ ret float %ret
+}
+
+; TODO: This will fold if we allow non-default floating point environments.
+define float @fsub_fneg_nnan_n0_fnX_ebmaytrap(float %a) #0 {
+; CHECK-LABEL: @fsub_fneg_nnan_n0_fnX_ebmaytrap(
+; CHECK-NEXT: [[NEGA:%.*]] = fneg float [[A:%.*]]
+; CHECK-NEXT: [[RET:%.*]] = call nnan float @llvm.experimental.constrained.fsub.f32(float -0.000000e+00, float [[NEGA]], metadata !"round.tonearest", metadata !"fpexcept.maytrap") #[[ATTR0]]
+; CHECK-NEXT: ret float [[RET]]
+;
+ %nega = fneg float %a
+ %ret = call nnan float @llvm.experimental.constrained.fsub.f32(float -0.0, float %nega, metadata !"round.tonearest", metadata !"fpexcept.maytrap") #0
+ ret float %ret
+}
+
+; Missing nnan: must not fire.
+define float @fsub_fneg_n0_fnX_ebstrict(float %a) #0 {
+; CHECK-LABEL: @fsub_fneg_n0_fnX_ebstrict(
+; CHECK-NEXT: [[NEGA:%.*]] = fneg float [[A:%.*]]
+; CHECK-NEXT: [[RET:%.*]] = call float @llvm.experimental.constrained.fsub.f32(float -0.000000e+00, float [[NEGA]], metadata !"round.tonearest", metadata !"fpexcept.strict") #[[ATTR0]]
+; CHECK-NEXT: ret float [[RET]]
+;
+ %nega = fneg float %a
+ %ret = call float @llvm.experimental.constrained.fsub.f32(float -0.0, float %nega, metadata !"round.tonearest", metadata !"fpexcept.strict") #0
+ ret float %ret
+}
+
+; TODO: This will fold if we allow non-default floating point environments.
+; TODO: The instruction is expected to remain, but the result isn't used.
+define float @fsub_fneg_nnan_n0_fnX_ebstrict(float %a) #0 {
+; CHECK-LABEL: @fsub_fneg_nnan_n0_fnX_ebstrict(
+; CHECK-NEXT: [[NEGA:%.*]] = fneg float [[A:%.*]]
+; CHECK-NEXT: [[RET:%.*]] = call nnan float @llvm.experimental.constrained.fsub.f32(float -0.000000e+00, float [[NEGA]], metadata !"round.tonearest", metadata !"fpexcept.strict") #[[ATTR0]]
+; CHECK-NEXT: ret float [[RET]]
+;
+ %nega = fneg float %a
+ %ret = call nnan float @llvm.experimental.constrained.fsub.f32(float -0.0, float %nega, metadata !"round.tonearest", metadata !"fpexcept.strict") #0
+ ret float %ret
+}
+
+;
+; fsub -0.0, (fsub -0.0, X) ==> X
+;
+
+; TODO: This won't fire without m_FNeg() knowing the constrained intrinsics.
+define float @fsub_fsub_n0_fnX_defaultenv(float %a) #0 {
+; CHECK-LABEL: @fsub_fsub_n0_fnX_defaultenv(
+; CHECK-NEXT: [[NEGA:%.*]] = call float @llvm.experimental.constrained.fsub.f32(float -0.000000e+00, float [[A:%.*]], metadata !"round.tonearest", metadata !"fpexcept.ignore") #[[ATTR0]]
+; CHECK-NEXT: [[RET:%.*]] = call float @llvm.experimental.constrained.fsub.f32(float -0.000000e+00, float [[NEGA]], metadata !"round.tonearest", metadata !"fpexcept.ignore") #[[ATTR0]]
+; CHECK-NEXT: ret float [[RET]]
+;
+ %nega = call float @llvm.experimental.constrained.fsub.f32(float -0.0, float %a, metadata !"round.tonearest", metadata !"fpexcept.ignore") #0
+ %ret = call float @llvm.experimental.constrained.fsub.f32(float -0.0, float %nega, metadata !"round.tonearest", metadata !"fpexcept.ignore") #0
+ ret float %ret
+}
+
+; Missing nnan: must not fire.
+define float @fsub_fsub_n0_fnX_ebmaytrap(float %a) #0 {
+; CHECK-LABEL: @fsub_fsub_n0_fnX_ebmaytrap(
+; CHECK-NEXT: [[NEGA:%.*]] = call float @llvm.experimental.constrained.fsub.f32(float -0.000000e+00, float [[A:%.*]], metadata !"round.tonearest", metadata !"fpexcept.maytrap") #[[ATTR0]]
+; CHECK-NEXT: [[RET:%.*]] = call float @llvm.experimental.constrained.fsub.f32(float -0.000000e+00, float [[NEGA]], metadata !"round.tonearest", metadata !"fpexcept.maytrap") #[[ATTR0]]
+; CHECK-NEXT: ret float [[RET]]
+;
+ %nega = call float @llvm.experimental.constrained.fsub.f32(float -0.0, float %a, metadata !"round.tonearest", metadata !"fpexcept.maytrap") #0
+ %ret = call float @llvm.experimental.constrained.fsub.f32(float -0.0, float %nega, metadata !"round.tonearest", metadata !"fpexcept.maytrap") #0
+ ret float %ret
+}
+
+; TODO: This won't fire without m_FNeg() knowing the constrained intrinsics.
+define float @fsub_fsub_nnan_n0_fnX_ebmaytrap(float %a) #0 {
+; CHECK-LABEL: @fsub_fsub_nnan_n0_fnX_ebmaytrap(
+; CHECK-NEXT: [[NEGA:%.*]] = call float @llvm.experimental.constrained.fsub.f32(float -0.000000e+00, float [[A:%.*]], metadata !"round.tonearest", metadata !"fpexcept.maytrap") #[[ATTR0]]
+; CHECK-NEXT: [[RET:%.*]] = call nnan float @llvm.experimental.constrained.fsub.f32(float -0.000000e+00, float [[NEGA]], metadata !"round.tonearest", metadata !"fpexcept.maytrap") #[[ATTR0]]
+; CHECK-NEXT: ret float [[RET]]
+;
+ %nega = call float @llvm.experimental.constrained.fsub.f32(float -0.0, float %a, metadata !"round.tonearest", metadata !"fpexcept.maytrap") #0
+ %ret = call nnan float @llvm.experimental.constrained.fsub.f32(float -0.0, float %nega, metadata !"round.tonearest", metadata !"fpexcept.maytrap") #0
+ ret float %ret
+}
+
+; Missing nnan: must not fire.
+define float @fsub_fsub_n0_fnX_ebstrict(float %a) #0 {
+; CHECK-LABEL: @fsub_fsub_n0_fnX_ebstrict(
+; CHECK-NEXT: [[NEGA:%.*]] = call float @llvm.experimental.constrained.fsub.f32(float -0.000000e+00, float [[A:%.*]], metadata !"round.tonearest", metadata !"fpexcept.strict") #[[ATTR0]]
+; CHECK-NEXT: [[RET:%.*]] = call float @llvm.experimental.constrained.fsub.f32(float -0.000000e+00, float [[NEGA]], metadata !"round.tonearest", metadata !"fpexcept.strict") #[[ATTR0]]
+; CHECK-NEXT: ret float [[RET]]
+;
+ %nega = call float @llvm.experimental.constrained.fsub.f32(float -0.0, float %a, metadata !"round.tonearest", metadata !"fpexcept.strict") #0
+ %ret = call float @llvm.experimental.constrained.fsub.f32(float -0.0, float %nega, metadata !"round.tonearest", metadata !"fpexcept.strict") #0
+ ret float %ret
+}
+
+; TODO: This won't fire without m_FNeg() knowing the constrained intrinsics.
+define float @fsub_fsub_nnan_n0_fnX_ebstrict(float %a) #0 {
+; CHECK-LABEL: @fsub_fsub_nnan_n0_fnX_ebstrict(
+; CHECK-NEXT: [[NEGA:%.*]] = call nnan float @llvm.experimental.constrained.fsub.f32(float -0.000000e+00, float [[A:%.*]], metadata !"round.tonearest", metadata !"fpexcept.strict") #[[ATTR0]]
+; CHECK-NEXT: [[RET:%.*]] = call nnan float @llvm.experimental.constrained.fsub.f32(float -0.000000e+00, float [[NEGA]], metadata !"round.tonearest", metadata !"fpexcept.strict") #[[ATTR0]]
+; CHECK-NEXT: ret float [[RET]]
+;
+ %nega = call nnan float @llvm.experimental.constrained.fsub.f32(float -0.0, float %a, metadata !"round.tonearest", metadata !"fpexcept.strict") #0
+ %ret = call nnan float @llvm.experimental.constrained.fsub.f32(float -0.0, float %nega, metadata !"round.tonearest", metadata !"fpexcept.strict") #0
+ ret float %ret
+}
+
+;
+; fsub 0.0, (fneg X) ==> X if signed zeros are ignored.
+;
+
+define float @fsub_fneg_nsz_p0_fnX_defaultenv(float %a) #0 {
+; CHECK-LABEL: @fsub_fneg_nsz_p0_fnX_defaultenv(
+; CHECK-NEXT: ret float [[A:%.*]]
+;
+ %nega = fneg float %a
+ %ret = call nsz float @llvm.experimental.constrained.fsub.f32(float 0.0, float %nega, metadata !"round.tonearest", metadata !"fpexcept.ignore") #0
+ ret float %ret
+}
+
+; Missing nnan: must not fire.
+define float @fsub_fneg_nsz_p0_fnX_ebmaytrap(float %a) #0 {
+; CHECK-LABEL: @fsub_fneg_nsz_p0_fnX_ebmaytrap(
+; CHECK-NEXT: [[NEGA:%.*]] = fneg float [[A:%.*]]
+; CHECK-NEXT: [[RET:%.*]] = call nsz float @llvm.experimental.constrained.fsub.f32(float 0.000000e+00, float [[NEGA]], metadata !"round.tonearest", metadata !"fpexcept.maytrap") #[[ATTR0]]
+; CHECK-NEXT: ret float [[RET]]
+;
+ %nega = fneg float %a
+ %ret = call nsz float @llvm.experimental.constrained.fsub.f32(float 0.0, float %nega, metadata !"round.tonearest", metadata !"fpexcept.maytrap") #0
+ ret float %ret
+}
+
+; TODO: This will fold if we allow non-default floating point environments.
+define float @fsub_fneg_nsz_nnan_p0_fnX_ebmaytrap(float %a) #0 {
+; CHECK-LABEL: @fsub_fneg_nsz_nnan_p0_fnX_ebmaytrap(
+; CHECK-NEXT: [[NEGA:%.*]] = fneg float [[A:%.*]]
+; CHECK-NEXT: [[RET:%.*]] = call nnan nsz float @llvm.experimental.constrained.fsub.f32(float 0.000000e+00, float [[NEGA]], metadata !"round.tonearest", metadata !"fpexcept.maytrap") #[[ATTR0]]
+; CHECK-NEXT: ret float [[RET]]
+;
+ %nega = fneg float %a
+ %ret = call nnan nsz float @llvm.experimental.constrained.fsub.f32(float 0.0, float %nega, metadata !"round.tonearest", metadata !"fpexcept.maytrap") #0
+ ret float %ret
+}
+
+; Missing nnan: must not fire.
+define float @fsub_fneg_nsz_p0_fnX_ebstrict(float %a) #0 {
+; CHECK-LABEL: @fsub_fneg_nsz_p0_fnX_ebstrict(
+; CHECK-NEXT: [[NEGA:%.*]] = fneg float [[A:%.*]]
+; CHECK-NEXT: [[RET:%.*]] = call nsz float @llvm.experimental.constrained.fsub.f32(float 0.000000e+00, float [[NEGA]], metadata !"round.tonearest", metadata !"fpexcept.strict") #[[ATTR0]]
+; CHECK-NEXT: ret float [[RET]]
+;
+ %nega = fneg float %a
+ %ret = call nsz float @llvm.experimental.constrained.fsub.f32(float 0.0, float %nega, metadata !"round.tonearest", metadata !"fpexcept.strict") #0
+ ret float %ret
+}
+
+; TODO: This will fold if we allow non-default floating point environments.
+; TODO: The instruction is expected to remain, but the result isn't used.
+define float @fsub_fneg_nnan_nsz_p0_fnX_ebstrict(float %a) #0 {
+; CHECK-LABEL: @fsub_fneg_nnan_nsz_p0_fnX_ebstrict(
+; CHECK-NEXT: [[NEGA:%.*]] = fneg float [[A:%.*]]
+; CHECK-NEXT: [[RET:%.*]] = call nnan nsz float @llvm.experimental.constrained.fsub.f32(float 0.000000e+00, float [[NEGA]], metadata !"round.tonearest", metadata !"fpexcept.strict") #[[ATTR0]]
+; CHECK-NEXT: ret float [[RET]]
+;
+ %nega = fneg float %a
+ %ret = call nnan nsz float @llvm.experimental.constrained.fsub.f32(float 0.0, float %nega, metadata !"round.tonearest", metadata !"fpexcept.strict") #0
+ ret float %ret
+}
+
+;
+; fsub 0.0, (fsub 0.0, X) ==> X if signed zeros are ignored.
+;
+
+; TODO: Need constrained intrinsic support in m_FNeg() and m_FSub to fire.
+define float @fsub_fsub_p0_nsz_fnX_defaultenv(float %a) #0 {
+; CHECK-LABEL: @fsub_fsub_p0_nsz_fnX_defaultenv(
+; CHECK-NEXT: [[NEGA:%.*]] = call nsz float @llvm.experimental.constrained.fsub.f32(float 0.000000e+00, float [[A:%.*]], metadata !"round.tonearest", metadata !"fpexcept.ignore") #[[ATTR0]]
+; CHECK-NEXT: [[RET:%.*]] = call nsz float @llvm.experimental.constrained.fsub.f32(float 0.000000e+00, float [[NEGA]], metadata !"round.tonearest", metadata !"fpexcept.ignore") #[[ATTR0]]
+; CHECK-NEXT: ret float [[RET]]
+;
+ %nega = call nsz float @llvm.experimental.constrained.fsub.f32(float 0.0, float %a, metadata !"round.tonearest", metadata !"fpexcept.ignore") #0
+ %ret = call nsz float @llvm.experimental.constrained.fsub.f32(float 0.0, float %nega, metadata !"round.tonearest", metadata !"fpexcept.ignore") #0
+ ret float %ret
+}
+
+; Missing nnan: must not fire.
+define float @fsub_fsub_nsz_p0_fnX_ebmaytrap(float %a) #0 {
+; CHECK-LABEL: @fsub_fsub_nsz_p0_fnX_ebmaytrap(
+; CHECK-NEXT: [[NEGA:%.*]] = call nsz float @llvm.experimental.constrained.fsub.f32(float 0.000000e+00, float [[A:%.*]], metadata !"round.tonearest", metadata !"fpexcept.maytrap") #[[ATTR0]]
+; CHECK-NEXT: [[RET:%.*]] = call nsz float @llvm.experimental.constrained.fsub.f32(float 0.000000e+00, float [[NEGA]], metadata !"round.tonearest", metadata !"fpexcept.maytrap") #[[ATTR0]]
+; CHECK-NEXT: ret float [[RET]]
+;
+ %nega = call nsz float @llvm.experimental.constrained.fsub.f32(float 0.0, float %a, metadata !"round.tonearest", metadata !"fpexcept.maytrap") #0
+ %ret = call nsz float @llvm.experimental.constrained.fsub.f32(float 0.0, float %nega, metadata !"round.tonearest", metadata !"fpexcept.maytrap") #0
+ ret float %ret
+}
+
+; TODO: Need constrained intrinsic support in m_FNeg() and m_FSub to fire.
+define float @fsub_fsub_nnan_nsz_p0_fnX_ebmaytrap(float %a) #0 {
+; CHECK-LABEL: @fsub_fsub_nnan_nsz_p0_fnX_ebmaytrap(
+; CHECK-NEXT: [[NEGA:%.*]] = call nnan nsz float @llvm.experimental.constrained.fsub.f32(float 0.000000e+00, float [[A:%.*]], metadata !"round.tonearest", metadata !"fpexcept.maytrap") #[[ATTR0]]
+; CHECK-NEXT: [[RET:%.*]] = call nnan nsz float @llvm.experimental.constrained.fsub.f32(float 0.000000e+00, float [[NEGA]], metadata !"round.tonearest", metadata !"fpexcept.maytrap") #[[ATTR0]]
+; CHECK-NEXT: ret float [[RET]]
+;
+ %nega = call nnan nsz float @llvm.experimental.constrained.fsub.f32(float 0.0, float %a, metadata !"round.tonearest", metadata !"fpexcept.maytrap") #0
+ %ret = call nnan nsz float @llvm.experimental.constrained.fsub.f32(float 0.0, float %nega, metadata !"round.tonearest", metadata !"fpexcept.maytrap") #0
+ ret float %ret
+}
+
+; Missing nnan: must not fire.
+define float @fsub_fsub_nsz_p0_fnX_ebstrict(float %a) #0 {
+; CHECK-LABEL: @fsub_fsub_nsz_p0_fnX_ebstrict(
+; CHECK-NEXT: [[NEGA:%.*]] = call nsz float @llvm.experimental.constrained.fsub.f32(float 0.000000e+00, float [[A:%.*]], metadata !"round.tonearest", metadata !"fpexcept.strict") #[[ATTR0]]
+; CHECK-NEXT: [[RET:%.*]] = call nsz float @llvm.experimental.constrained.fsub.f32(float 0.000000e+00, float [[NEGA]], metadata !"round.tonearest", metadata !"fpexcept.strict") #[[ATTR0]]
+; CHECK-NEXT: ret float [[RET]]
+;
+ %nega = call nsz float @llvm.experimental.constrained.fsub.f32(float 0.0, float %a, metadata !"round.tonearest", metadata !"fpexcept.strict") #0
+ %ret = call nsz float @llvm.experimental.constrained.fsub.f32(float 0.0, float %nega, metadata !"round.tonearest", metadata !"fpexcept.strict") #0
+ ret float %ret
+}
+
+; TODO: Need constrained intrinsic support in m_FNeg() and m_FSub to fire.
+define float @fsub_fsub_nnan_nsz_p0_fnX_ebstrict(float %a) #0 {
+; CHECK-LABEL: @fsub_fsub_nnan_nsz_p0_fnX_ebstrict(
+; CHECK-NEXT: [[NEGA:%.*]] = call nnan nsz float @llvm.experimental.constrained.fsub.f32(float 0.000000e+00, float [[A:%.*]], metadata !"round.tonearest", metadata !"fpexcept.strict") #[[ATTR0]]
+; CHECK-NEXT: [[RET:%.*]] = call nnan nsz float @llvm.experimental.constrained.fsub.f32(float 0.000000e+00, float [[NEGA]], metadata !"round.tonearest", metadata !"fpexcept.strict") #[[ATTR0]]
+; CHECK-NEXT: ret float [[RET]]
+;
+ %nega = call nnan nsz float @llvm.experimental.constrained.fsub.f32(float 0.0, float %a, metadata !"round.tonearest", metadata !"fpexcept.strict") #0
+ %ret = call nnan nsz float @llvm.experimental.constrained.fsub.f32(float 0.0, float %nega, metadata !"round.tonearest", metadata !"fpexcept.strict") #0
+ ret float %ret
+}
+
+;
+; fsub nnan x, x ==> 0.0
+;
+
+; Missing nnan: must not fire.
+define float @fsub_x_x_defaultenv(float %a) #0 {
+; CHECK-LABEL: @fsub_x_x_defaultenv(
+; CHECK-NEXT: [[RET:%.*]] = call float @llvm.experimental.constrained.fsub.f32(float [[A:%.*]], float [[A]], metadata !"round.tonearest", metadata !"fpexcept.ignore") #[[ATTR0]]
+; CHECK-NEXT: ret float [[RET]]
+;
+ %ret = call float @llvm.experimental.constrained.fsub.f32(float %a, float %a, metadata !"round.tonearest", metadata !"fpexcept.ignore") #0
+ ret float %ret
+}
+
+define float @fsub_nnan_x_x_defaultenv(float %a) #0 {
+; CHECK-LABEL: @fsub_nnan_x_x_defaultenv(
+; CHECK-NEXT: ret float 0.000000e+00
+;
+ %ret = call nnan float @llvm.experimental.constrained.fsub.f32(float %a, float %a, metadata !"round.tonearest", metadata !"fpexcept.ignore") #0
+ ret float %ret
+}
+
+; Missing nnan: must not fire.
+define float @fsub_x_x_ebmaytrap(float %a) #0 {
+; CHECK-LABEL: @fsub_x_x_ebmaytrap(
+; CHECK-NEXT: [[RET:%.*]] = call float @llvm.experimental.constrained.fsub.f32(float [[A:%.*]], float [[A]], metadata !"round.tonearest", metadata !"fpexcept.maytrap") #[[ATTR0]]
+; CHECK-NEXT: ret float [[RET]]
+;
+ %ret = call float @llvm.experimental.constrained.fsub.f32(float %a, float %a, metadata !"round.tonearest", metadata !"fpexcept.maytrap") #0
+ ret float %ret
+}
+
+; TODO: This will fold if we allow non-default floating point environments.
+define float @fsub_nnan_x_x_ebmaytrap(float %a) #0 {
+; CHECK-LABEL: @fsub_nnan_x_x_ebmaytrap(
+; CHECK-NEXT: [[RET:%.*]] = call nnan float @llvm.experimental.constrained.fsub.f32(float [[A:%.*]], float [[A]], metadata !"round.tonearest", metadata !"fpexcept.maytrap") #[[ATTR0]]
+; CHECK-NEXT: ret float [[RET]]
+;
+ %ret = call nnan float @llvm.experimental.constrained.fsub.f32(float %a, float %a, metadata !"round.tonearest", metadata !"fpexcept.maytrap") #0
+ ret float %ret
+}
+
+; Missing nnan: must not fire.
+define float @fsub_x_x_ebstrict(float %a) #0 {
+; CHECK-LABEL: @fsub_x_x_ebstrict(
+; CHECK-NEXT: [[RET:%.*]] = call float @llvm.experimental.constrained.fsub.f32(float [[A:%.*]], float [[A]], metadata !"round.tonearest", metadata !"fpexcept.strict") #[[ATTR0]]
+; CHECK-NEXT: ret float [[RET]]
+;
+ %ret = call float @llvm.experimental.constrained.fsub.f32(float %a, float %a, metadata !"round.tonearest", metadata !"fpexcept.strict") #0
+ ret float %ret
+}
+
+; TODO: This will fold if we allow non-default floating point environments.
+; TODO: The instruction is expected to remain, but the result isn't used.
+define float @fsub_nnan_x_x_ebstrict(float %a) #0 {
+; CHECK-LABEL: @fsub_nnan_x_x_ebstrict(
+; CHECK-NEXT: [[RET:%.*]] = call nnan float @llvm.experimental.constrained.fsub.f32(float [[A:%.*]], float [[A]], metadata !"round.tonearest", metadata !"fpexcept.strict") #[[ATTR0]]
+; CHECK-NEXT: ret float [[RET]]
+;
+ %ret = call nnan float @llvm.experimental.constrained.fsub.f32(float %a, float %a, metadata !"round.tonearest", metadata !"fpexcept.strict") #0
+ ret float %ret
+}
+
+;
+; Y - (Y - X) --> X
+;
+
+; Missing nsz and reassoc: must not fire
+define float @fsub_fsub_y_x_x_defaultenv(float %x, float %y) #0 {
+; CHECK-LABEL: @fsub_fsub_y_x_x_defaultenv(
+; CHECK-NEXT: [[INNER:%.*]] = call float @llvm.experimental.constrained.fsub.f32(float [[Y:%.*]], float [[X:%.*]], metadata !"round.tonearest", metadata !"fpexcept.ignore") #[[ATTR0]]
+; CHECK-NEXT: [[RET:%.*]] = call float @llvm.experimental.constrained.fsub.f32(float [[Y]], float [[INNER]], metadata !"round.tonearest", metadata !"fpexcept.ignore") #[[ATTR0]]
+; CHECK-NEXT: ret float [[RET]]
+;
+ %inner = call float @llvm.experimental.constrained.fsub.f32(float %y, float %x, metadata !"round.tonearest", metadata !"fpexcept.ignore") #0
+ %ret = call float @llvm.experimental.constrained.fsub.f32(float %y, float %inner, metadata !"round.tonearest", metadata !"fpexcept.ignore") #0
+ ret float %ret
+}
+
+; TODO: Need constrained intrinsic support in m_c_FAdd() and m_FSub to fire.
+define float @fsub_fsub_fmf_y_x_x_defaultenv(float %x, float %y) #0 {
+; CHECK-LABEL: @fsub_fsub_fmf_y_x_x_defaultenv(
+; CHECK-NEXT: [[INNER:%.*]] = call float @llvm.experimental.constrained.fsub.f32(float [[Y:%.*]], float [[X:%.*]], metadata !"round.tonearest", metadata !"fpexcept.ignore") #[[ATTR0]]
+; CHECK-NEXT: [[RET:%.*]] = call reassoc nsz float @llvm.experimental.constrained.fsub.f32(float [[Y]], float [[INNER]], metadata !"round.tonearest", metadata !"fpexcept.ignore") #[[ATTR0]]
+; CHECK-NEXT: ret float [[RET]]
+;
+ %inner = call float @llvm.experimental.constrained.fsub.f32(float %y, float %x, metadata !"round.tonearest", metadata !"fpexcept.ignore") #0
+ %ret = call nsz reassoc float @llvm.experimental.constrained.fsub.f32(float %y, float %inner, metadata !"round.tonearest", metadata !"fpexcept.ignore") #0
+ ret float %ret
+}
+
+; TODO: Consider how alternate rounding modes can break these transforms.
+
+; The "fpexcept.maytrap" instruction must _not_ be folded into the
+; "fpexcept.ignore" instruction. This must not fire.
+define float @fsub_fsub_fmf_y_x_x_ebmaytrap_defaultenv(float %x, float %y) #0 {
+; CHECK-LABEL: @fsub_fsub_fmf_y_x_x_ebmaytrap_defaultenv(
+; CHECK-NEXT: [[INNER:%.*]] = call float @llvm.experimental.constrained.fsub.f32(float [[Y:%.*]], float [[X:%.*]], metadata !"round.tonearest", metadata !"fpexcept.maytrap") #[[ATTR0]]
+; CHECK-NEXT: [[RET:%.*]] = call reassoc nsz float @llvm.experimental.constrained.fsub.f32(float [[Y]], float [[INNER]], metadata !"round.tonearest", metadata !"fpexcept.ignore") #[[ATTR0]]
+; CHECK-NEXT: ret float [[RET]]
+;
+ %inner = call float @llvm.experimental.constrained.fsub.f32(float %y, float %x, metadata !"round.tonearest", metadata !"fpexcept.maytrap") #0
+ %ret = call nsz reassoc float @llvm.experimental.constrained.fsub.f32(float %y, float %inner, metadata !"round.tonearest", metadata !"fpexcept.ignore") #0
+ ret float %ret
+}
+
+; Missing nsz and reassoc: must not fire
+define float @fsub_fsub_y_x_x_ebmaytrap(float %x, float %y) #0 {
+; CHECK-LABEL: @fsub_fsub_y_x_x_ebmaytrap(
+; CHECK-NEXT: [[INNER:%.*]] = call float @llvm.experimental.constrained.fsub.f32(float [[Y:%.*]], float [[X:%.*]], metadata !"round.tonearest", metadata !"fpexcept.maytrap") #[[ATTR0]]
+; CHECK-NEXT: [[RET:%.*]] = call float @llvm.experimental.constrained.fsub.f32(float [[Y]], float [[INNER]], metadata !"round.tonearest", metadata !"fpexcept.maytrap") #[[ATTR0]]
+; CHECK-NEXT: ret float [[RET]]
+;
+ %inner = call float @llvm.experimental.constrained.fsub.f32(float %y, float %x, metadata !"round.tonearest", metadata !"fpexcept.maytrap") #0
+ %ret = call float @llvm.experimental.constrained.fsub.f32(float %y, float %inner, metadata !"round.tonearest", metadata !"fpexcept.maytrap") #0
+ ret float %ret
+}
+
+; TODO: Need constrained intrinsic support in m_c_FAdd() and m_FSub to fire.
+define float @fsub_fsub_fmf_y_x_x_ebmaytrap(float %x, float %y) #0 {
+; CHECK-LABEL: @fsub_fsub_fmf_y_x_x_ebmaytrap(
+; CHECK-NEXT: [[INNER:%.*]] = call float @llvm.experimental.constrained.fsub.f32(float [[Y:%.*]], float [[X:%.*]], metadata !"round.tonearest", metadata !"fpexcept.maytrap") #[[ATTR0]]
+; CHECK-NEXT: [[RET:%.*]] = call reassoc nsz float @llvm.experimental.constrained.fsub.f32(float [[Y]], float [[INNER]], metadata !"round.tonearest", metadata !"fpexcept.maytrap") #[[ATTR0]]
+; CHECK-NEXT: ret float [[RET]]
+;
+ %inner = call float @llvm.experimental.constrained.fsub.f32(float %y, float %x, metadata !"round.tonearest", metadata !"fpexcept.maytrap") #0
+ %ret = call nsz reassoc float @llvm.experimental.constrained.fsub.f32(float %y, float %inner, metadata !"round.tonearest", metadata !"fpexcept.maytrap") #0
+ ret float %ret
+}
+
+; Missing nsz and reassoc: must not fire
+define float @fsub_fsub_y_x_x_ebstrict(float %x, float %y) #0 {
+; CHECK-LABEL: @fsub_fsub_y_x_x_ebstrict(
+; CHECK-NEXT: [[INNER:%.*]] = call float @llvm.experimental.constrained.fsub.f32(float [[Y:%.*]], float [[X:%.*]], metadata !"round.tonearest", metadata !"fpexcept.strict") #[[ATTR0]]
+; CHECK-NEXT: [[RET:%.*]] = call float @llvm.experimental.constrained.fsub.f32(float [[Y]], float [[INNER]], metadata !"round.tonearest", metadata !"fpexcept.strict") #[[ATTR0]]
+; CHECK-NEXT: ret float [[RET]]
+;
+ %inner = call float @llvm.experimental.constrained.fsub.f32(float %y, float %x, metadata !"round.tonearest", metadata !"fpexcept.strict") #0
+ %ret = call float @llvm.experimental.constrained.fsub.f32(float %y, float %inner, metadata !"round.tonearest", metadata !"fpexcept.strict") #0
+ ret float %ret
+}
+
+; TODO: Need constrained intrinsic support in m_c_FAdd() and m_FSub to fire.
+define float @fsub_fsub_fmf_y_x_x_ebstrict(float %x, float %y) #0 {
+; CHECK-LABEL: @fsub_fsub_fmf_y_x_x_ebstrict(
+; CHECK-NEXT: [[INNER:%.*]] = call float @llvm.experimental.constrained.fsub.f32(float [[Y:%.*]], float [[X:%.*]], metadata !"round.tonearest", metadata !"fpexcept.strict") #[[ATTR0]]
+; CHECK-NEXT: [[RET:%.*]] = call reassoc nsz float @llvm.experimental.constrained.fsub.f32(float [[Y]], float [[INNER]], metadata !"round.tonearest", metadata !"fpexcept.strict") #[[ATTR0]]
+; CHECK-NEXT: ret float [[RET]]
+;
+ %inner = call float @llvm.experimental.constrained.fsub.f32(float %y, float %x, metadata !"round.tonearest", metadata !"fpexcept.strict") #0
+ %ret = call nsz reassoc float @llvm.experimental.constrained.fsub.f32(float %y, float %inner, metadata !"round.tonearest", metadata !"fpexcept.strict") #0
+ ret float %ret
+}
+
+;
+; (X + Y) - Y --> X
+; TODO: Missing IR matcher support means these won't fire.
+;
+
+; Missing nsz and reassoc: must not fire
+define float @fadd_fsub_x_y_y_defaultenv(float %x, float %y) #0 {
+; CHECK-LABEL: @fadd_fsub_x_y_y_defaultenv(
+; CHECK-NEXT: [[INNER:%.*]] = call float @llvm.experimental.constrained.fadd.f32(float [[X:%.*]], float [[Y:%.*]], metadata !"round.tonearest", metadata !"fpexcept.ignore") #[[ATTR0]]
+; CHECK-NEXT: [[RET:%.*]] = call float @llvm.experimental.constrained.fsub.f32(float [[INNER]], float [[Y]], metadata !"round.tonearest", metadata !"fpexcept.ignore") #[[ATTR0]]
+; CHECK-NEXT: ret float [[RET]]
+;
+ %inner = call float @llvm.experimental.constrained.fadd.f32(float %x, float %y, metadata !"round.tonearest", metadata !"fpexcept.ignore") #0
+ %ret = call float @llvm.experimental.constrained.fsub.f32(float %inner, float %y, metadata !"round.tonearest", metadata !"fpexcept.ignore") #0
+ ret float %ret
+}
+
+; TODO: Need constrained intrinsic support in m_c_FAdd() and m_FSub to fire.
+define float @fadd_fsub_fmf_x_y_y_defaultenv(float %x, float %y) #0 {
+; CHECK-LABEL: @fadd_fsub_fmf_x_y_y_defaultenv(
+; CHECK-NEXT: [[INNER:%.*]] = call float @llvm.experimental.constrained.fadd.f32(float [[X:%.*]], float [[Y:%.*]], metadata !"round.tonearest", metadata !"fpexcept.ignore") #[[ATTR0]]
+; CHECK-NEXT: [[RET:%.*]] = call reassoc nsz float @llvm.experimental.constrained.fsub.f32(float [[INNER]], float [[Y]], metadata !"round.tonearest", metadata !"fpexcept.ignore") #[[ATTR0]]
+; CHECK-NEXT: ret float [[RET]]
+;
+ %inner = call float @llvm.experimental.constrained.fadd.f32(float %x, float %y, metadata !"round.tonearest", metadata !"fpexcept.ignore") #0
+ %ret = call nsz reassoc float @llvm.experimental.constrained.fsub.f32(float %inner, float %y, metadata !"round.tonearest", metadata !"fpexcept.ignore") #0
+ ret float %ret
+}
+
+; The "fpexcept.maytrap" instruction must _not_ be folded into the
+; "fpexcept.ignore" instruction. This must not fire.
+define float @fadd_fsub_fmf_x_y_y_ebmaytrap_defaultenv(float %x, float %y) #0 {
+; CHECK-LABEL: @fadd_fsub_fmf_x_y_y_ebmaytrap_defaultenv(
+; CHECK-NEXT: [[INNER:%.*]] = call float @llvm.experimental.constrained.fadd.f32(float [[X:%.*]], float [[Y:%.*]], metadata !"round.tonearest", metadata !"fpexcept.maytrap") #[[ATTR0]]
+; CHECK-NEXT: [[RET:%.*]] = call reassoc nsz float @llvm.experimental.constrained.fsub.f32(float [[INNER]], float [[Y]], metadata !"round.tonearest", metadata !"fpexcept.ignore") #[[ATTR0]]
+; CHECK-NEXT: ret float [[RET]]
+;
+ %inner = call float @llvm.experimental.constrained.fadd.f32(float %x, float %y, metadata !"round.tonearest", metadata !"fpexcept.maytrap") #0
+ %ret = call nsz reassoc float @llvm.experimental.constrained.fsub.f32(float %inner, float %y, metadata !"round.tonearest", metadata !"fpexcept.ignore") #0
+ ret float %ret
+}
+
+; Missing nsz and reassoc: must not fire
+define float @fadd_fsub_x_y_y_ebmaytrap(float %x, float %y) #0 {
+; CHECK-LABEL: @fadd_fsub_x_y_y_ebmaytrap(
+; CHECK-NEXT: [[INNER:%.*]] = call float @llvm.experimental.constrained.fadd.f32(float [[X:%.*]], float [[Y:%.*]], metadata !"round.tonearest", metadata !"fpexcept.maytrap") #[[ATTR0]]
+; CHECK-NEXT: [[RET:%.*]] = call float @llvm.experimental.constrained.fsub.f32(float [[INNER]], float [[Y]], metadata !"round.tonearest", metadata !"fpexcept.maytrap") #[[ATTR0]]
+; CHECK-NEXT: ret float [[RET]]
+;
+ %inner = call float @llvm.experimental.constrained.fadd.f32(float %x, float %y, metadata !"round.tonearest", metadata !"fpexcept.maytrap") #0
+ %ret = call float @llvm.experimental.constrained.fsub.f32(float %inner, float %y, metadata !"round.tonearest", metadata !"fpexcept.maytrap") #0
+ ret float %ret
+}
+
+; TODO: Need constrained intrinsic support in m_c_FAdd() and m_FSub to fire.
+define float @fadd_fsub_fmf_x_y_y_ebmaytrap(float %x, float %y) #0 {
+; CHECK-LABEL: @fadd_fsub_fmf_x_y_y_ebmaytrap(
+; CHECK-NEXT: [[INNER:%.*]] = call float @llvm.experimental.constrained.fadd.f32(float [[X:%.*]], float [[Y:%.*]], metadata !"round.tonearest", metadata !"fpexcept.maytrap") #[[ATTR0]]
+; CHECK-NEXT: [[RET:%.*]] = call reassoc nsz float @llvm.experimental.constrained.fsub.f32(float [[INNER]], float [[Y]], metadata !"round.tonearest", metadata !"fpexcept.maytrap") #[[ATTR0]]
+; CHECK-NEXT: ret float [[RET]]
+;
+ %inner = call float @llvm.experimental.constrained.fadd.f32(float %x, float %y, metadata !"round.tonearest", metadata !"fpexcept.maytrap") #0
+ %ret = call nsz reassoc float @llvm.experimental.constrained.fsub.f32(float %inner, float %y, metadata !"round.tonearest", metadata !"fpexcept.maytrap") #0
+ ret float %ret
+}
+
+; Missing nsz and reassoc: must not fire
+define float @fadd_fsub_x_y_y_ebstrict(float %x, float %y) #0 {
+; CHECK-LABEL: @fadd_fsub_x_y_y_ebstrict(
+; CHECK-NEXT: [[INNER:%.*]] = call float @llvm.experimental.constrained.fadd.f32(float [[X:%.*]], float [[Y:%.*]], metadata !"round.tonearest", metadata !"fpexcept.strict") #[[ATTR0]]
+; CHECK-NEXT: [[RET:%.*]] = call float @llvm.experimental.constrained.fsub.f32(float [[INNER]], float [[Y]], metadata !"round.tonearest", metadata !"fpexcept.strict") #[[ATTR0]]
+; CHECK-NEXT: ret float [[RET]]
+;
+ %inner = call float @llvm.experimental.constrained.fadd.f32(float %x, float %y, metadata !"round.tonearest", metadata !"fpexcept.strict") #0
+ %ret = call float @llvm.experimental.constrained.fsub.f32(float %inner, float %y, metadata !"round.tonearest", metadata !"fpexcept.strict") #0
+ ret float %ret
+}
+
+; TODO: Need constrained intrinsic support in m_c_FAdd() and m_FSub to fire.
+define float @fadd_fsub_fmf_x_y_y_ebstrict(float %x, float %y) #0 {
+; CHECK-LABEL: @fadd_fsub_fmf_x_y_y_ebstrict(
+; CHECK-NEXT: [[INNER:%.*]] = call float @llvm.experimental.constrained.fadd.f32(float [[X:%.*]], float [[Y:%.*]], metadata !"round.tonearest", metadata !"fpexcept.strict") #[[ATTR0]]
+; CHECK-NEXT: [[RET:%.*]] = call reassoc nsz float @llvm.experimental.constrained.fsub.f32(float [[INNER]], float [[Y]], metadata !"round.tonearest", metadata !"fpexcept.strict") #[[ATTR0]]
+; CHECK-NEXT: ret float [[RET]]
+;
+ %inner = call float @llvm.experimental.constrained.fadd.f32(float %x, float %y, metadata !"round.tonearest", metadata !"fpexcept.strict") #0
+ %ret = call nsz reassoc float @llvm.experimental.constrained.fsub.f32(float %inner, float %y, metadata !"round.tonearest", metadata !"fpexcept.strict") #0
+ ret float %ret
+}
+
+declare float @llvm.fabs.f32(float)
+declare <2 x float> @llvm.fabs.v2f32(<2 x float>)
+
+declare float @llvm.experimental.constrained.fadd.f32(float, float, metadata, metadata) #0
+declare float @llvm.experimental.constrained.fsub.f32(float, float, metadata, metadata) #0
+
+declare float @llvm.experimental.constrained.sitofp.f32.i32(i32, metadata, metadata) #0
+
+attributes #0 = { strictfp }
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