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[ValueTracking] Fix computeKnownFPClass for fpext (#81972)
This patch adds the missing `subnormal -> normal` part for `fpext` in `computeKnownFPClass`. Fixes the miscompilation reported by #80941 (comment). (cherry picked from commit a5865c3)
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,32 @@ | ||
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 4 | ||
; RUN: opt -S -passes=instcombine < %s | FileCheck %s | ||
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define float @pr80941(float %arg) { | ||
; CHECK-LABEL: define float @pr80941( | ||
; CHECK-SAME: float [[ARG:%.*]]) { | ||
; CHECK-NEXT: entry: | ||
; CHECK-NEXT: [[COND:%.*]] = tail call i1 @llvm.is.fpclass.f32(float [[ARG]], i32 144) | ||
; CHECK-NEXT: br i1 [[COND]], label [[IF_THEN:%.*]], label [[IF_EXIT:%.*]] | ||
; CHECK: if.then: | ||
; CHECK-NEXT: [[FPEXT:%.*]] = fpext float [[ARG]] to double | ||
; CHECK-NEXT: [[SIGN:%.*]] = call double @llvm.copysign.f64(double 0.000000e+00, double [[FPEXT]]) | ||
; CHECK-NEXT: [[FPTRUNC:%.*]] = fptrunc double [[SIGN]] to float | ||
; CHECK-NEXT: br label [[IF_EXIT]] | ||
; CHECK: if.exit: | ||
; CHECK-NEXT: [[RET:%.*]] = phi float [ [[FPTRUNC]], [[IF_THEN]] ], [ [[ARG]], [[ENTRY:%.*]] ] | ||
; CHECK-NEXT: ret float [[RET]] | ||
; | ||
entry: | ||
%cond = tail call i1 @llvm.is.fpclass.f32(float %arg, i32 144) | ||
br i1 %cond, label %if.then, label %if.exit | ||
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if.then: | ||
%fpext = fpext float %arg to double | ||
%sign = call double @llvm.copysign.f64(double 0.000000e+00, double %fpext) | ||
%fptrunc = fptrunc double %sign to float | ||
br label %if.exit | ||
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if.exit: | ||
%ret = phi float [ %fptrunc, %if.then ], [ %arg, %entry ] | ||
ret float %ret | ||
} |