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[X86] Add PR40483 test case 

llvm-svn: 352480
This commit is contained in:
Simon Pilgrim 2019-01-29 10:58:42 +00:00
parent 4684f824d4
commit 4293ad8ab2
1 changed files with 57 additions and 0 deletions
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57
llvm/test/CodeGen/X86/combine-sbb.ll
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@ -149,4 +149,61 @@ define i8 @PR24545(i32, i32, i32* nocapture readonly) {
%12 = zext i1 %11 to i8
ret i8 %12
}
define i32 @PR40483_sub1(i32*, i32) nounwind {
; X86-LABEL: PR40483_sub1:
; X86: # %bb.0:
; X86-NEXT: pushl %esi
; X86-NEXT: movl {{[0-9]+}}(%esp), %eax
; X86-NEXT: movl {{[0-9]+}}(%esp), %ecx
; X86-NEXT: movl (%ecx), %edx
; X86-NEXT: movl %edx, %esi
; X86-NEXT: subl %eax, %esi
; X86-NEXT: movl %esi, (%ecx)
; X86-NEXT: subl %edx, %eax
; X86-NEXT: addl %esi, %eax
; X86-NEXT: popl %esi
; X86-NEXT: retl
;
; X64-LABEL: PR40483_sub1:
; X64: # %bb.0:
; X64-NEXT: movl (%rdi), %ecx
; X64-NEXT: movl %ecx, %eax
; X64-NEXT: subl %esi, %eax
; X64-NEXT: movl %eax, (%rdi)
; X64-NEXT: subl %ecx, %esi
; X64-NEXT: addl %esi, %eax
; X64-NEXT: retq
%3 = load i32, i32* %0, align 4
%4 = tail call { i8, i32 } @llvm.x86.subborrow.32(i8 0, i32 %3, i32 %1)
%5 = extractvalue { i8, i32 } %4, 1
store i32 %5, i32* %0, align 4
%6 = sub i32 %1, %3
%7 = add i32 %6, %5
ret i32 %7
}
define i32 @PR40483_sub2(i32*, i32) nounwind {
; X86-LABEL: PR40483_sub2:
; X86: # %bb.0:
; X86-NEXT: movl {{[0-9]+}}(%esp), %eax
; X86-NEXT: movl {{[0-9]+}}(%esp), %ecx
; X86-NEXT: subl %eax, (%ecx)
; X86-NEXT: xorl %eax, %eax
; X86-NEXT: retl
;
; X64-LABEL: PR40483_sub2:
; X64: # %bb.0:
; X64-NEXT: subl %esi, (%rdi)
; X64-NEXT: xorl %eax, %eax
; X64-NEXT: retq
%3 = load i32, i32* %0, align 4
%4 = sub i32 %3, %1
%5 = tail call { i8, i32 } @llvm.x86.subborrow.32(i8 0, i32 %3, i32 %1)
%6 = extractvalue { i8, i32 } %5, 1
store i32 %6, i32* %0, align 4
%7 = sub i32 %4, %6
ret i32 %7
}
declare { i8, i32 } @llvm.x86.subborrow.32(i8, i32, i32)