c55d9af8c0
Instead of trying to pattern match the code produced by ISD::ABS expansion, just custom legalize ISD::ABS to the desired sequence. The one test change is because a DAG combine for (neg (abs)) is no longer firing because ISD::ABS is now Custom instead of Expand. Differential Revision: https://reviews.llvm.org/D92154
18 lines
513 B
LLVM
18 lines
513 B
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc -verify-machineinstrs \
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; RUN: -mtriple=aarch64-unknown-unknown < %s | FileCheck %s
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declare i64 @llvm.abs.i64(i64, i1 immarg)
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define i64@neg_abs(i64 %x) {
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; CHECK-LABEL: neg_abs:
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; CHECK: // %bb.0:
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; CHECK-NEXT: cmp x0, #0 // =0
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; CHECK-NEXT: cneg x8, x0, mi
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; CHECK-NEXT: neg x0, x8
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; CHECK-NEXT: ret
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%abs = tail call i64 @llvm.abs.i64(i64 %x, i1 true)
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%neg = sub nsw i64 0, %abs
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ret i64 %neg
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}
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