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[x86] add test for setcc sub->shift transform; NFC 

llvm-svn: 353618
This commit is contained in:
Sanjay Patel 2019-02-09 16:41:20 +00:00
parent 9419b5bd04
commit f31cf49c58
1 changed files with 14 additions and 0 deletions
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14
llvm/test/CodeGen/X86/setcc-combine.ll
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@ -283,3 +283,17 @@ define i64 @PR40657(i8 %var2, i8 %var9) {
ret i64 %res.cast
}
define i64 @sub_to_shift_to_add(i32 %x, i32 %y, i64 %s1, i64 %s2) {
; CHECK-LABEL: sub_to_shift_to_add:
; CHECK: # %bb.0:
; CHECK-NEXT: movq %rdx, %rax
; CHECK-NEXT: addl %esi, %esi
; CHECK-NEXT: cmpl %esi, %edi
; CHECK-NEXT: cmovneq %rcx, %rax
; CHECK-NEXT: retq
%sub = sub i32 %x, %y
%cmp = icmp eq i32 %sub, %y
%r = select i1 %cmp, i64 %s1, i64 %s2
ret i64 %r
}