35 lines
780 B
LLVM
35 lines
780 B
LLVM
; RUN: llc < %s -march=arm -mattr=+v4t | FileCheck %s
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;; Integer absolute value, should produce something as good as: ARM:
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;; movs r0, r0
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;; rsbmi r0, r0, #0
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;; bx lr
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define i32 @test(i32 %a) {
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%tmp1neg = sub i32 0, %a
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%b = icmp sgt i32 %a, -1
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%abs = select i1 %b, i32 %a, i32 %tmp1neg
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ret i32 %abs
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; CHECK: cmp
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; CHECK: rsbmi r0, r0, #0
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; CHECK: bx lr
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}
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; rdar://11633193
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;; 3 instructions will be generated for abs(a-b):
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;; subs
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;; rsbmi
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;; bx
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define i32 @test2(i32 %a, i32 %b) nounwind readnone ssp {
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entry:
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; CHECK: test2
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; CHECK: subs
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; CHECK-NEXT: rsbmi
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; CHECK-NEXT: bx
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%sub = sub nsw i32 %a, %b
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%cmp = icmp sgt i32 %sub, -1
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%sub1 = sub nsw i32 0, %sub
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%cond = select i1 %cmp, i32 %sub, i32 %sub1
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ret i32 %cond
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}
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