derek.holloway
7502bf64a4
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52 lines
1.4 KiB
LLVM
52 lines
1.4 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc < %s -mtriple=aarch64-unknown-unknown -global-isel | FileCheck %s --check-prefixes=GISEL
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; fold (sub -1, a) -> (xor a, -1)
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define i64 @sub_minus_one(i64 %a) {
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; GISEL-LABEL: sub_minus_one:
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; GISEL: // %bb.0: // %entry
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; GISEL-NEXT: mvn x0, x0
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; GISEL-NEXT: ret
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entry:
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%sub1 = sub i64 -1, %a
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ret i64 %sub1
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}
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define <8 x i16> @sub_minus_one_vec(<8 x i16> %x) {
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; GISEL-LABEL: sub_minus_one_vec:
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; GISEL: // %bb.0:
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; GISEL-NEXT: mvn v0.16b, v0.16b
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; GISEL-NEXT: ret
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%sub1 = sub <8 x i16> <i16 -1, i16 -1, i16 -1, i16 -1, i16 -1, i16 -1, i16 -1, i16 -1>, %x
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ret <8 x i16> %sub1
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}
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define i64 @sub_one_from_sub(i64 %a, i64 %b) {
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; GISEL-LABEL: sub_one_from_sub:
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; GISEL: // %bb.0: // %entry
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; GISEL-NEXT: mvn x8, x1
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; GISEL-NEXT: add x0, x8, x0
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; GISEL-NEXT: ret
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entry:
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; fold (A - B) - 1 -> add (xor B, -1), A
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%sub1 = sub i64 %a, %b
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%sub2 = sub i64 %sub1, 1
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ret i64 %sub2
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}
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; fold (A - B) - 1 -> add (xor B, -1), A
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define i64 @sub_one_from_sub_one_use(i64 %a, i64 %b) {
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; GISEL-LABEL: sub_one_from_sub_one_use:
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; GISEL: // %bb.0: // %entry
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; GISEL-NEXT: sub x8, x0, x1
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; GISEL-NEXT: sub x9, x8, #1
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; GISEL-NEXT: mul x0, x8, x9
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; GISEL-NEXT: ret
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entry:
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; fold (A - (0 - B)) to (A + B)
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%sub1 = sub i64 %a, %b
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%sub2 = sub i64 %sub1, 1
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%mul = mul i64 %sub1, %sub2
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ret i64 %mul
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}
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