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283961f4c8
With the addition of the `willreturn` attribute, functions that may not return (e.g. due to an infinite loop) are well defined, if they are not marked as `willreturn`. This patch updates `wouldInstructionBeTriviallyDead` to not consider calls that may not return as dead. This patch still provides an escape hatch for intrinsics, which are still assumed as willreturn unconditionally. It will be removed once all intrinsics definitions have been reviewed and updated. Reviewed By: jdoerfert Differential Revision: https://reviews.llvm.org/D94106
32 lines
916 B
LLVM
32 lines
916 B
LLVM
; RUN: opt < %s -instcombine -S | FileCheck %s
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declare double @acos(double) willreturn
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; Check that functions without any function attributes are simplified.
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define double @test_simplify_acos() {
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; CHECK-LABEL: @test_simplify_acos
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%pi = call double @acos(double -1.000000e+00)
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; CHECK-NOT: call double @acos
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; CHECK: ret double 0x400921FB54442D18
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ret double %pi
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}
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; Check that we don't constant fold builtin functions.
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define double @test_acos_nobuiltin() {
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; CHECK-LABEL: @test_acos_nobuiltin
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%pi = call double @acos(double -1.000000e+00) nobuiltin
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; CHECK: call double @acos(double -1.000000e+00)
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ret double %pi
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}
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; Check that we don't constant fold strictfp results that require rounding.
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define double @test_acos_strictfp() strictfp {
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; CHECK-LABEL: @test_acos_strictfp
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%pi = call double @acos(double -1.000000e+00) strictfp
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; CHECK: call double @acos(double -1.000000e+00)
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ret double %pi
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}
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