5a4e11ad9c
When merging through a TokenFactor we need to check that the load may be ordered such that no other aliasing memory operations may happen. It is not sufficient to just check that the load is a member of the chain token factor as it there may be a indirect chain. Require the load's chain has only one use. This fixes PR37826. Reviewers: spatel, davide, efriedma, craig.topper, RKSimon Subscribers: hiraditya, llvm-commits Differential Revision: https://reviews.llvm.org/D49388 llvm-svn: 337560
61 lines
2.0 KiB
LLVM
61 lines
2.0 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc -o - %s -mtriple=x86_64--unknown-linux-gnu | FileCheck %s
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; When compiled and run this should print zero.
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@c = common local_unnamed_addr global i32 0, align 4
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@f = common local_unnamed_addr global i32 0, align 4
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@e = common local_unnamed_addr global i32 0, align 4
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@.str.1 = private unnamed_addr constant [4 x i8] c"%d\0A\00", align 1
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; We should only see a single store to f (a bytes store to f+3).
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define void @k(i32 %l) {
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; CHECK-LABEL: k:
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; CHECK: # %bb.0:
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; CHECK-NEXT: movl {{.*}}(%rip), %eax
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; CHECK-NEXT: orl {{.*}}(%rip), %eax
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; CHECK-NEXT: shrl $24, %eax
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; CHECK-NEXT: movb %al, f+{{.*}}(%rip)
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; CHECK-NEXT: retq
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%load = load i32, i32* @c, align 4
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%load6 = load i32, i32* @f, align 4
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%clear7 = and i32 %load6, 16777215
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store i32 %clear7, i32* @c, align 4
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%neg = and i32 %load6, 2097151
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%value = xor i32 %neg, 2097151
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store i32 %load, i32* @c, align 4
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%t0 = load i32, i32* @e, align 4
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%value15 = xor i32 %t0, %value
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%clear16 = and i32 %load6, -16777216
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%set17 = or i32 %value15, %clear16
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store i32 %set17, i32* @f, align 4
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%clear25 = and i32 %set17, -16777216
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%set26 = or i32 %clear25, %clear7
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store i32 %set26, i32* @f, align 4
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ret void
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}
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declare i32 @printf(i8* nocapture readonly, ...)
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define i32 @main() {
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; CHECK-LABEL: main:
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; CHECK: # %bb.0:
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; CHECK-NEXT: pushq %rax
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; CHECK-NEXT: .cfi_def_cfa_offset 16
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; CHECK-NEXT: movl $1, %edi
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; CHECK-NEXT: callq k
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; CHECK-NEXT: movl {{.*}}(%rip), %esi
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; CHECK-NEXT: movl $.L.str.1, %edi
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; CHECK-NEXT: xorl %eax, %eax
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; CHECK-NEXT: callq printf
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; CHECK-NEXT: xorl %eax, %eax
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; CHECK-NEXT: popq %rcx
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; CHECK-NEXT: .cfi_def_cfa_offset 8
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; CHECK-NEXT: retq
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tail call void @k(i32 1)
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%load = load i32, i32* @f, align 4
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%call = tail call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i32 %load)
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ret i32 0
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}
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