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[X86] Add 'less_than_ideal' followup test case from PR24545 

llvm-svn: 352272
This commit is contained in:
Simon Pilgrim 2019-01-26 12:51:52 +00:00
parent 21cdcd7b2b
commit 3cdf3f681d
1 changed files with 35 additions and 0 deletions
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35
llvm/test/CodeGen/X86/combine-sbb.ll
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@ -122,3 +122,38 @@ top:
}
declare { i64, i1 } @llvm.usub.with.overflow.i64(i64, i64)
; PR24545 less_than_ideal()
define i8 @PR24545(i32, i32, i32* nocapture readonly) {
; X86-LABEL: PR24545:
; X86: # %bb.0:
; X86-NEXT: movl {{[0-9]+}}(%esp), %eax
; X86-NEXT: movl {{[0-9]+}}(%esp), %ecx
; X86-NEXT: movl (%ecx), %edx
; X86-NEXT: cmpl {{[0-9]+}}(%esp), %edx
; X86-NEXT: seta %dl
; X86-NEXT: addb $-1, %dl
; X86-NEXT: sbbl 4(%ecx), %eax
; X86-NEXT: setb %al
; X86-NEXT: retl
;
; X64-LABEL: PR24545:
; X64: # %bb.0:
; X64-NEXT: cmpl %edi, (%rdx)
; X64-NEXT: seta %al
; X64-NEXT: addb $-1, %al
; X64-NEXT: sbbl 4(%rdx), %esi
; X64-NEXT: setb %al
; X64-NEXT: retq
%4 = load i32, i32* %2
%5 = icmp ugt i32 %4, %0
%6 = zext i1 %5 to i8
%7 = getelementptr inbounds i32, i32* %2, i32 1
%8 = load i32, i32* %7
%9 = tail call { i8, i32 } @llvm.x86.subborrow.32(i8 %6, i32 %1, i32 %8)
%10 = extractvalue { i8, i32 } %9, 0
%11 = icmp ne i8 %10, 0
%12 = zext i1 %11 to i8
ret i8 %12
}
declare { i8, i32 } @llvm.x86.subborrow.32(i8, i32, i32)