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[CodeGen][X86][NFC] Tests for (sub Carry, X) -> (addcarry (sub 0, X), 0, Carry) fold (D62392)

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llvm-svn: 372258
This commit is contained in:
Roman Lebedev 2019-09-18 20:48:05 +00:00
parent ad7efc958c
commit e34754387d
1 changed files with 21 additions and 0 deletions
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21
test/CodeGen/X86/subcarry.ll
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@ -162,3 +162,24 @@ entry:
%40 = insertvalue %S undef, [4 x i64] %39, 0
ret %S %40
}
declare {i64, i1} @llvm.uadd.with.overflow(i64, i64)
declare {i64, i1} @llvm.usub.with.overflow(i64, i64)
define i64 @sub_from_carry(i64 %x, i64 %y, i64* %valout, i64 %z) {
; CHECK-LABEL: sub_from_carry:
; CHECK: # %bb.0:
; CHECK-NEXT: xorl %eax, %eax
; CHECK-NEXT: addq %rsi, %rdi
; CHECK-NEXT: setb %al
; CHECK-NEXT: movq %rdi, (%rdx)
; CHECK-NEXT: subq %rcx, %rax
; CHECK-NEXT: retq
%agg = call {i64, i1} @llvm.uadd.with.overflow(i64 %x, i64 %y)
%val = extractvalue {i64, i1} %agg, 0
%ov = extractvalue {i64, i1} %agg, 1
store i64 %val, i64* %valout, align 4
%carry = zext i1 %ov to i64
%res = sub i64 %carry, %z
ret i64 %res
}