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Code Issues Projects Releases Wiki Activity

[ExpandMemCmp] Trigger on bcmp too.

Browse Source 
Summary: Fixes 41150.

Reviewers: gchatelet

Subscribers: hiraditya, llvm-commits, ckennelly, sbenza, jyknight

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D59593

llvm-svn: 356550
This commit is contained in:
Clement Courbet 2019-03-20 11:51:11 +00:00
parent 1e0c591375
commit 39ecd2c585
2 changed files with 31 additions and 1 deletions
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3
lib/CodeGen/ExpandMemCmp.cpp
View File

@ -823,7 +823,8 @@ bool ExpandMemCmpPass::runOnBlock(
}
LibFunc Func;
if (TLI->getLibFunc(ImmutableCallSite(CI), Func) &&
Func == LibFunc_memcmp && expandMemCmp(CI, TTI, TL, &DL)) {
(Func == LibFunc_memcmp || Func == LibFunc_bcmp) &&
expandMemCmp(CI, TTI, TL, &DL)) {
return true;
}
}

29
test/CodeGen/X86/memcmp-optsize.ll
View File

@ -10,6 +10,7 @@
@.str = private constant [65 x i8] c"0123456789012345678901234567890123456789012345678901234567890123\00", align 1
declare i32 @memcmp(i8*, i8*, i64)
declare i32 @bcmp(i8*, i8*, i64)
define i32 @length2(i8* %X, i8* %Y) nounwind optsize {
; X86-LABEL: length2:
@ -982,3 +983,31 @@ define i1 @length64_eq_const(i8* %X) nounwind optsize {
ret i1 %c
}
define i32 @bcmp_length2(i8* %X, i8* %Y) nounwind optsize {
; X86-LABEL: bcmp_length2:
; X86: # %bb.0:
; X86-NEXT: movl {{[0-9]+}}(%esp), %eax
; X86-NEXT: movl {{[0-9]+}}(%esp), %ecx
; X86-NEXT: movzwl (%ecx), %ecx
; X86-NEXT: movzwl (%eax), %edx
; X86-NEXT: rolw $8, %cx
; X86-NEXT: rolw $8, %dx
; X86-NEXT: movzwl %cx, %eax
; X86-NEXT: movzwl %dx, %ecx
; X86-NEXT: subl %ecx, %eax
; X86-NEXT: retl
;
; X64-LABEL: bcmp_length2:
; X64: # %bb.0:
; X64-NEXT: movzwl (%rdi), %eax
; X64-NEXT: movzwl (%rsi), %ecx
; X64-NEXT: rolw $8, %ax
; X64-NEXT: rolw $8, %cx
; X64-NEXT: movzwl %ax, %eax
; X64-NEXT: movzwl %cx, %ecx
; X64-NEXT: subl %ecx, %eax
; X64-NEXT: retq
%m = tail call i32 @bcmp(i8* %X, i8* %Y, i64 2) nounwind
ret i32 %m
}