[llvm] 876f3d6 - ValueTracking: Add test for isKnownNeverInfinity for fptrunc
Matt Arsenault via llvm-commits
llvm-commits at lists.llvm.org
Thu Dec 22 06:38:20 PST 2022
Author: Matt Arsenault
Date: 2022-12-22T09:38:14-05:00
New Revision: 876f3d6c91e4e3862ac4027b09720a77aa4299cf
URL: https://github.com/llvm/llvm-project/commit/876f3d6c91e4e3862ac4027b09720a77aa4299cf
DIFF: https://github.com/llvm/llvm-project/commit/876f3d6c91e4e3862ac4027b09720a77aa4299cf.diff
LOG: ValueTracking: Add test for isKnownNeverInfinity for fptrunc
Added:
Modified:
llvm/lib/Analysis/ValueTracking.cpp
llvm/test/Transforms/InstSimplify/floating-point-compare.ll
Removed:
################################################################################
diff --git a/llvm/lib/Analysis/ValueTracking.cpp b/llvm/lib/Analysis/ValueTracking.cpp
index dbf2ef51eba32..ee88074e1145f 100644
--- a/llvm/lib/Analysis/ValueTracking.cpp
+++ b/llvm/lib/Analysis/ValueTracking.cpp
@@ -3797,6 +3797,10 @@ bool llvm::isKnownNeverInfinity(const Value *V, const TargetLibraryInfo *TLI,
// Peek through to source op. If it is not infinity, this is not infinity.
return isKnownNeverInfinity(Inst->getOperand(0), TLI, Depth + 1);
}
+ case Instruction::FPTrunc: {
+ // Need a range check.
+ return false;
+ }
default:
break;
}
diff --git a/llvm/test/Transforms/InstSimplify/floating-point-compare.ll b/llvm/test/Transforms/InstSimplify/floating-point-compare.ll
index 8f6e4fa069cc3..a8c3ffff7bf5e 100644
--- a/llvm/test/Transforms/InstSimplify/floating-point-compare.ll
+++ b/llvm/test/Transforms/InstSimplify/floating-point-compare.ll
@@ -1264,6 +1264,30 @@ define i1 @isKnownNeverInfinity_fpext_sitofp(i16 %x) {
ret i1 %r
}
+define i1 @isKnownNeverInfinity_fptrunc(double %x) {
+; CHECK-LABEL: @isKnownNeverInfinity_fptrunc(
+; CHECK-NEXT: [[A:%.*]] = fadd ninf double [[X:%.*]], 1.000000e+00
+; CHECK-NEXT: [[E:%.*]] = fptrunc double [[A]] to float
+; CHECK-NEXT: [[R:%.*]] = fcmp une float [[E]], 0x7FF0000000000000
+; CHECK-NEXT: ret i1 [[R]]
+;
+ %a = fadd ninf double %x, 1.0
+ %e = fptrunc double %a to float
+ %r = fcmp une float %e, 0x7FF0000000000000
+ ret i1 %r
+}
+
+define i1 @isNotKnownNeverInfinity_fptrunc(double %unknown) {
+; CHECK-LABEL: @isNotKnownNeverInfinity_fptrunc(
+; CHECK-NEXT: [[E:%.*]] = fptrunc double [[UNKNOWN:%.*]] to float
+; CHECK-NEXT: [[R:%.*]] = fcmp une float [[E]], 0x7FF0000000000000
+; CHECK-NEXT: ret i1 [[R]]
+;
+ %e = fptrunc double %unknown to float
+ %r = fcmp une float %e, 0x7FF0000000000000
+ ret i1 %r
+}
+
define i1 @isKnownNeverInfinity_canonicalize(double %x) {
; CHECK-LABEL: @isKnownNeverInfinity_canonicalize(
; CHECK-NEXT: ret i1 true
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