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; RUN: llc < %s -march=arm | FileCheck %s
define i64 @f1(i64 %a, i64 %b) {
; CHECK: f1:
; CHECK: subs r
; CHECK: sbc r
entry:
%tmp = sub i64 %a, %b
ret i64 %tmp
}
define i64 @f2(i64 %a, i64 %b) {
; CHECK: f2:
; CHECK: adc r
; CHECK: subs r
; CHECK: sbc r
entry:
%tmp1 = shl i64 %a, 1
%tmp2 = sub i64 %tmp1, %b
ret i64 %tmp2
}
; add with live carry
define i64 @f3(i32 %al, i32 %bl) {
; CHECK: f3:
; CHECK: adds r
; CHECK: adc r
entry:
; unsigned wide add
%aw = zext i32 %al to i64
%bw = zext i32 %bl to i64
%cw = add i64 %aw, %bw
; ch == carry bit
%ch = lshr i64 %cw, 32
%dw = add i64 %ch, %bw
ret i64 %dw
}
; rdar://10073745
define i64 @f4(i64 %x) nounwind readnone {
entry:
; CHECK: f4:
; CHECK: rsbs r
; CHECK: rsc r
%0 = sub nsw i64 0, %x
ret i64 %0
}
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