llvm/test/Transforms/EarlyCSE/writeonly.ll at master - llvm - Free-Git: DMCA Non-Compliant

RPCS3/llvm

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Yevgeny Rouban 53fb41197c [IR] Fix mayReadFromMemory() for writeonly calls

Current implementation of Instruction::mayReadFromMemory()
returns !doesNotAccessMemory() which is !ReadNone. This
does not take into account that the writeonly attribute
also indicates that the call does not read from memory.

The patch changes the predicate to !doesNotReadMemory()
that reflects the intended behavior.

Differential Revision: https://reviews.llvm.org/D69086

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@375389 91177308-0d34-0410-b5e6-96231b3b80d8

2019-10-21 06:52:08 +00:00

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 ; RUN: opt -S -early-cse < %s | FileCheck %s
 @var = global i32 undef
 declare void @foo() nounwind
 define void @test() {
 ; CHECK-LABEL: @test(
 ; CHECK-NOT: store
   store i32 1, i32* @var
 ; CHECK: call void @foo()
   call void @foo() writeonly
 ; CHECK: store i32 2, i32* @var
   store i32 2, i32* @var
   ret void
 }