[llvm] 5dbeed2 - ValueTracking: ldexp never introduces poison

[Matt Arsenault via llvm-commits]

Author: Matt Arsenault
Date: 2023-08-11T19:54:57-04:00
New Revision: 5dbeed2e5b5f4d5f7662481d30a0ededba36dcdf

URL: https://github.com/llvm/llvm-project/commit/5dbeed2e5b5f4d5f7662481d30a0ededba36dcdf
DIFF: https://github.com/llvm/llvm-project/commit/5dbeed2e5b5f4d5f7662481d30a0ededba36dcdf.diff

LOG: ValueTracking: ldexp never introduces poison

Added: 
    

Modified: 
    llvm/lib/Analysis/ValueTracking.cpp
    llvm/test/Transforms/InstCombine/freeze-fp-ops.ll

Removed: 
    


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diff  --git a/llvm/lib/Analysis/ValueTracking.cpp b/llvm/lib/Analysis/ValueTracking.cpp
index aa1514129f5d3c..d8f710e26d435a 100644
--- a/llvm/lib/Analysis/ValueTracking.cpp
+++ b/llvm/lib/Analysis/ValueTracking.cpp
@@ -6581,6 +6581,7 @@ static bool canCreateUndefOrPoison(const Operator *Op, bool PoisonOnly,
       case Intrinsic::minimum:
       case Intrinsic::maximum:
       case Intrinsic::is_fpclass:
+      case Intrinsic::ldexp:
         return false;
       case Intrinsic::lround:
       case Intrinsic::llround:

diff  --git a/llvm/test/Transforms/InstCombine/freeze-fp-ops.ll b/llvm/test/Transforms/InstCombine/freeze-fp-ops.ll
index 3a45530fbc99ed..504ad171cef140 100644
--- a/llvm/test/Transforms/InstCombine/freeze-fp-ops.ll
+++ b/llvm/test/Transforms/InstCombine/freeze-fp-ops.ll
@@ -517,6 +517,17 @@ define float @freeze_fptrunc_round(double %arg0) {
   ret float %freeze
 }
 
+define float @freeze_ldexp(float %arg0, i32 noundef %arg1) {
+; CHECK-LABEL: @freeze_ldexp(
+; CHECK-NEXT:    [[ARG0_FR:%.*]] = freeze float [[ARG0:%.*]]
+; CHECK-NEXT:    [[OP:%.*]] = call float @llvm.ldexp.f32.i32(float [[ARG0_FR]], i32 [[ARG1:%.*]])
+; CHECK-NEXT:    ret float [[OP]]
+;
+  %op = call float @llvm.ldexp.f32.i32(float %arg0, i32 %arg1)
+  %freeze = freeze float %op
+  ret float %freeze
+}
+
 declare float @llvm.fma.f32(float, float, float)
 declare float @llvm.fmuladd.f32(float, float, float)
 declare float @llvm.sqrt.f32(float)
@@ -550,3 +561,4 @@ declare float @llvm.minimum.f32(float, float)
 declare float @llvm.maximum.f32(float, float)
 declare i1 @llvm.is.fpclass.f32(float, i32 immarg)
 declare float @llvm.fptrunc.round.f32.f64(double, metadata)
+declare float @llvm.ldexp.f32.i32(float, i32)