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[X86] Add test for PR39926; NFC 

The test file shows a case where the avoid store forwarding block
pass misses to copy a range (-1..1) when the load displacement
changes sign.

Baseline test for D55485.

llvm-svn: 348712
This commit is contained in:
Nikita Popov 2018-12-09 12:02:56 +00:00
parent 60b88127c5
commit 3192449412
1 changed files with 48 additions and 0 deletions
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48
llvm/test/CodeGen/X86/pr39926.ll Normal file
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; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc < %s -mtriple=x86_64-unknown-linux-gnu -mattr=avx | FileCheck %s
define i8 @test_offset(i8* %base) {
; CHECK-LABEL: test_offset:
; CHECK: # %bb.0: # %entry
; CHECK-NEXT: pushq %rax
; CHECK-NEXT: .cfi_def_cfa_offset 16
; CHECK-NEXT: movb $0, 7(%rdi)
; CHECK-NEXT: movw $0, 5(%rdi)
; CHECK-NEXT: movl $0, 1(%rdi)
; CHECK-NEXT: movzwl -4(%rdi), %eax
; CHECK-NEXT: movw %ax, -{{[0-9]+}}(%rsp)
; CHECK-NEXT: movb -2(%rdi), %al
; CHECK-NEXT: movb %al, -{{[0-9]+}}(%rsp)
; CHECK-NEXT: movl 1(%rdi), %eax
; CHECK-NEXT: movl %eax, -{{[0-9]+}}(%rsp)
; CHECK-NEXT: movzwl 5(%rdi), %eax
; CHECK-NEXT: movw %ax, -{{[0-9]+}}(%rsp)
; CHECK-NEXT: movb 7(%rdi), %al
; CHECK-NEXT: movb %al, -{{[0-9]+}}(%rsp)
; CHECK-NEXT: movl 8(%rdi), %eax
; CHECK-NEXT: movl %eax, -{{[0-9]+}}(%rsp)
; CHECK-NEXT: movb -{{[0-9]+}}(%rsp), %al
; CHECK-NEXT: popq %rcx
; CHECK-NEXT: .cfi_def_cfa_offset 8
; CHECK-NEXT: retq
entry:
%z = alloca [128 x i8], align 16
%gep0 = getelementptr inbounds i8, i8* %base, i64 7
store volatile i8 0, i8* %gep0
%gep1 = getelementptr inbounds i8, i8* %base, i64 5
%bc1 = bitcast i8* %gep1 to i16*
store volatile i16 0, i16* %bc1
%gep2 = getelementptr inbounds i8, i8* %base, i64 1
%bc2 = bitcast i8* %gep2 to i32*
store volatile i32 0, i32* %bc2
%y1 = getelementptr inbounds i8, i8* %base, i64 -4
%y2 = bitcast [128 x i8]* %z to i8*
call void @llvm.memcpy.p0i8.p0i8.i64(i8* %y2, i8* %y1, i64 16, i1 false)
%gep4 = getelementptr inbounds [128 x i8], [128 x i8]* %z, i64 0, i64 4
%ret = load i8, i8* %gep4
ret i8 %ret
}
; Function Attrs: argmemonly nounwind
declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture writeonly, i8* nocapture readonly, i64, i1)