4be35fd908
Normally, we use the result of the SUB flag for scalar comparison as its more compatible with CMP, but if we're testing for equality and already have a XOR we can reuse that instead. Fixes #6146
57 lines
1.4 KiB
LLVM
57 lines
1.4 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
|
|
; RUN: llc < %s -mtriple=i686--| FileCheck %s --check-prefixes=X86
|
|
; RUN: llc < %s -mtriple=x86_64--| FileCheck %s --check-prefixes=X64
|
|
|
|
;
|
|
; PR6146
|
|
;
|
|
|
|
define i32 @cmp_xor_i32(i32 %a, i32 %b, i32 %c)
|
|
; X86-LABEL: cmp_xor_i32:
|
|
; X86: # %bb.0:
|
|
; X86-NEXT: movl {{[0-9]+}}(%esp), %eax
|
|
; X86-NEXT: xorl {{[0-9]+}}(%esp), %eax
|
|
; X86-NEXT: jne .LBB0_2
|
|
; X86-NEXT: # %bb.1:
|
|
; X86-NEXT: movl {{[0-9]+}}(%esp), %eax
|
|
; X86-NEXT: .LBB0_2:
|
|
; X86-NEXT: retl
|
|
;
|
|
; X64-LABEL: cmp_xor_i32:
|
|
; X64: # %bb.0:
|
|
; X64-NEXT: movl %edi, %eax
|
|
; X64-NEXT: xorl %esi, %eax
|
|
; X64-NEXT: cmovel %edx, %eax
|
|
; X64-NEXT: retq
|
|
{
|
|
%xor = xor i32 %a, %b
|
|
%cmp = icmp eq i32 %a, %b
|
|
%sel = select i1 %cmp, i32 %c, i32 %xor
|
|
ret i32 %sel
|
|
}
|
|
|
|
define i32 @cmp_xor_i32_commute(i32 %a, i32 %b, i32 %c)
|
|
; X86-LABEL: cmp_xor_i32_commute:
|
|
; X86: # %bb.0:
|
|
; X86-NEXT: movl {{[0-9]+}}(%esp), %eax
|
|
; X86-NEXT: xorl {{[0-9]+}}(%esp), %eax
|
|
; X86-NEXT: jne .LBB1_2
|
|
; X86-NEXT: # %bb.1:
|
|
; X86-NEXT: movl {{[0-9]+}}(%esp), %eax
|
|
; X86-NEXT: .LBB1_2:
|
|
; X86-NEXT: retl
|
|
;
|
|
; X64-LABEL: cmp_xor_i32_commute:
|
|
; X64: # %bb.0:
|
|
; X64-NEXT: movl %edi, %eax
|
|
; X64-NEXT: xorl %esi, %eax
|
|
; X64-NEXT: cmovel %edx, %eax
|
|
; X64-NEXT: retq
|
|
{
|
|
%xor = xor i32 %b, %a
|
|
%cmp = icmp eq i32 %a, %b
|
|
%sel = select i1 %cmp, i32 %c, i32 %xor
|
|
ret i32 %sel
|
|
}
|
|
|