292077072e
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
42 lines
1.2 KiB
LLVM
42 lines
1.2 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -basic-aa -dse -enable-dse-memoryssa=false -S | FileCheck %s
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declare i8* @_Znwj(i32) willreturn
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declare void @foo() readnone willreturn
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define void @test1(i8** %ptr) {
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; CHECK-LABEL: @test1(
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; CHECK-NEXT: [[VAL:%.*]] = inttoptr i64 23452 to i8*
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; CHECK-NEXT: store i8* [[VAL]], i8** [[PTR:%.*]]
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; CHECK-NEXT: ret void
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;
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%val = inttoptr i64 23452 to i8*
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store i8* %val, i8** %ptr
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%call = call i8* @_Znwj(i32 1)
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store i8* %call, i8** %ptr
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store i8* %val, i8** %ptr
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ret void
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}
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define void @test2(i8** %ptr, i8* %p1, i8* %p2) {
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; CHECK-LABEL: @test2(
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; CHECK-NEXT: [[VAL:%.*]] = inttoptr i64 23452 to i8*
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; CHECK-NEXT: store i8* [[VAL]], i8** [[PTR:%.*]]
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; CHECK-NEXT: call void @foo()
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; CHECK-NEXT: store i8* [[P1:%.*]], i8** [[PTR]]
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; CHECK-NEXT: call void @foo()
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; CHECK-NEXT: store i8* [[VAL]], i8** [[PTR]]
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; CHECK-NEXT: ret void
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;
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%val = inttoptr i64 23452 to i8*
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store i8* %val, i8** %ptr
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call void @foo()
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store i8* %p1, i8** %ptr
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call void @foo()
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store i8* %p2, i8** %ptr
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%call = call i8* @_Znwj(i32 1)
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store i8* %call, i8** %ptr
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store i8* %val, i8** %ptr
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ret void
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}
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