[llvm] 084ff0d - [InstCombine] Add tests for `(icmp pred (ssub.sat X, Y), 0)`; NFC

[Noah Goldstein via llvm-commits]

Author: Noah Goldstein
Date: 2023-05-03T11:11:42-05:00
New Revision: 084ff0db90a6f827eeff87cfd17452ed352ea444

URL: https://github.com/llvm/llvm-project/commit/084ff0db90a6f827eeff87cfd17452ed352ea444
DIFF: https://github.com/llvm/llvm-project/commit/084ff0db90a6f827eeff87cfd17452ed352ea444.diff

LOG: [InstCombine] Add tests for `(icmp pred (ssub.sat X, Y), 0)`; NFC

Differential Revision: https://reviews.llvm.org/D149520

Added: 
    

Modified: 
    llvm/test/Transforms/InstCombine/cmp-intrinsic.ll

Removed: 
    


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diff  --git a/llvm/test/Transforms/InstCombine/cmp-intrinsic.ll b/llvm/test/Transforms/InstCombine/cmp-intrinsic.ll
index 931031d38a749..625cf9a0211be 100644
--- a/llvm/test/Transforms/InstCombine/cmp-intrinsic.ll
+++ b/llvm/test/Transforms/InstCombine/cmp-intrinsic.ll
@@ -9,6 +9,7 @@ declare i33 @llvm.cttz.i33(i33, i1)
 declare i32 @llvm.ctlz.i32(i32, i1)
 declare i8 @llvm.umax.i8(i8, i8)
 declare i8 @llvm.uadd.sat.i8(i8, i8)
+declare i8 @llvm.ssub.sat.i8(i8, i8)
 declare i33 @llvm.ctlz.i33(i33, i1)
 declare i8 @llvm.ctpop.i8(i8)
 declare i11 @llvm.ctpop.i11(i11)
@@ -880,3 +881,103 @@ define i1 @uadd_sat_ne_zero_fail_multiuse(i8 %x, i8 %y) {
   %r = icmp ne i8 %m, 0
   ret i1 %r
 }
+
+
+define i1 @ssub_sat_ne_zero(i8 %x, i8 %y) {
+; CHECK-LABEL: @ssub_sat_ne_zero(
+; CHECK-NEXT:    [[M:%.*]] = call i8 @llvm.ssub.sat.i8(i8 [[X:%.*]], i8 [[Y:%.*]])
+; CHECK-NEXT:    [[R:%.*]] = icmp ne i8 [[M]], 0
+; CHECK-NEXT:    ret i1 [[R]]
+;
+  %m = call i8 @llvm.ssub.sat.i8(i8 %x, i8 %y)
+  %r = icmp ne i8 %m, 0
+  ret i1 %r
+}
+
+define i1 @ssub_sat_ne_fail_nonzero(i8 %x, i8 %y) {
+; CHECK-LABEL: @ssub_sat_ne_fail_nonzero(
+; CHECK-NEXT:    [[M:%.*]] = call i8 @llvm.ssub.sat.i8(i8 [[X:%.*]], i8 [[Y:%.*]])
+; CHECK-NEXT:    [[R:%.*]] = icmp ne i8 [[M]], 4
+; CHECK-NEXT:    ret i1 [[R]]
+;
+  %m = call i8 @llvm.ssub.sat.i8(i8 %x, i8 %y)
+  %r = icmp ne i8 %m, 4
+  ret i1 %r
+}
+
+define i1 @ssub_sat_eq_zero(i8 %x, i8 %y) {
+; CHECK-LABEL: @ssub_sat_eq_zero(
+; CHECK-NEXT:    [[M:%.*]] = call i8 @llvm.ssub.sat.i8(i8 [[X:%.*]], i8 [[Y:%.*]])
+; CHECK-NEXT:    [[R:%.*]] = icmp eq i8 [[M]], 0
+; CHECK-NEXT:    ret i1 [[R]]
+;
+  %m = call i8 @llvm.ssub.sat.i8(i8 %x, i8 %y)
+  %r = icmp eq i8 %m, 0
+  ret i1 %r
+}
+
+define i1 @ssub_sat_sle_zero(i8 %x, i8 %y) {
+; CHECK-LABEL: @ssub_sat_sle_zero(
+; CHECK-NEXT:    [[M:%.*]] = call i8 @llvm.ssub.sat.i8(i8 [[X:%.*]], i8 [[Y:%.*]])
+; CHECK-NEXT:    [[R:%.*]] = icmp slt i8 [[M]], 1
+; CHECK-NEXT:    ret i1 [[R]]
+;
+  %m = call i8 @llvm.ssub.sat.i8(i8 %x, i8 %y)
+  %r = icmp sle i8 %m, 0
+  ret i1 %r
+}
+
+define i1 @ssub_sat_sge_zero(i8 %x, i8 %y) {
+; CHECK-LABEL: @ssub_sat_sge_zero(
+; CHECK-NEXT:    [[M:%.*]] = call i8 @llvm.ssub.sat.i8(i8 [[X:%.*]], i8 [[Y:%.*]])
+; CHECK-NEXT:    [[R:%.*]] = icmp sgt i8 [[M]], -1
+; CHECK-NEXT:    ret i1 [[R]]
+;
+  %m = call i8 @llvm.ssub.sat.i8(i8 %x, i8 %y)
+  %r = icmp sge i8 %m, 0
+  ret i1 %r
+}
+
+define i1 @ssub_sat_slt_zero(i8 %x, i8 %y) {
+; CHECK-LABEL: @ssub_sat_slt_zero(
+; CHECK-NEXT:    [[M:%.*]] = call i8 @llvm.ssub.sat.i8(i8 [[X:%.*]], i8 [[Y:%.*]])
+; CHECK-NEXT:    [[R:%.*]] = icmp slt i8 [[M]], 0
+; CHECK-NEXT:    ret i1 [[R]]
+;
+  %m = call i8 @llvm.ssub.sat.i8(i8 %x, i8 %y)
+  %r = icmp slt i8 %m, 0
+  ret i1 %r
+}
+
+define i1 @ssub_sat_slt_neg1_fail(i8 %x, i8 %y) {
+; CHECK-LABEL: @ssub_sat_slt_neg1_fail(
+; CHECK-NEXT:    [[M:%.*]] = call i8 @llvm.ssub.sat.i8(i8 [[X:%.*]], i8 [[Y:%.*]])
+; CHECK-NEXT:    [[R:%.*]] = icmp slt i8 [[M]], -1
+; CHECK-NEXT:    ret i1 [[R]]
+;
+  %m = call i8 @llvm.ssub.sat.i8(i8 %x, i8 %y)
+  %r = icmp slt i8 %m, -1
+  ret i1 %r
+}
+
+define i1 @ssub_sat_sgt_zero(i8 %x, i8 %y) {
+; CHECK-LABEL: @ssub_sat_sgt_zero(
+; CHECK-NEXT:    [[M:%.*]] = call i8 @llvm.ssub.sat.i8(i8 [[X:%.*]], i8 [[Y:%.*]])
+; CHECK-NEXT:    [[R:%.*]] = icmp sgt i8 [[M]], 0
+; CHECK-NEXT:    ret i1 [[R]]
+;
+  %m = call i8 @llvm.ssub.sat.i8(i8 %x, i8 %y)
+  %r = icmp sgt i8 %m, 0
+  ret i1 %r
+}
+
+define i1 @ssub_sat_sgt_one_fail(i8 %x, i8 %y) {
+; CHECK-LABEL: @ssub_sat_sgt_one_fail(
+; CHECK-NEXT:    [[M:%.*]] = call i8 @llvm.ssub.sat.i8(i8 [[X:%.*]], i8 [[Y:%.*]])
+; CHECK-NEXT:    [[R:%.*]] = icmp sgt i8 [[M]], 1
+; CHECK-NEXT:    ret i1 [[R]]
+;
+  %m = call i8 @llvm.ssub.sat.i8(i8 %x, i8 %y)
+  %r = icmp sgt i8 %m, 1
+  ret i1 %r
+}