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45d2c1d6aa
The original motivation for this patch comes from wanting to canonicalize more IR to selects and also canonicalizing min/max. If we're going to do that, we need more backend fixups to undo select codegen when simpler ops will do. I chose AArch64 for the tests because that shows the difference in the simplest way. This should fix: https://llvm.org/bugs/show_bug.cgi?id=31175 Differential Revision: https://reviews.llvm.org/D27489 llvm-svn: 289738
19 lines
439 B
LLVM
19 lines
439 B
LLVM
; RUN: llc < %s -mtriple=arm64-eabi | FileCheck %s
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; Optimize (x > -1) to (x >= 0) etc.
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; Optimize (cmp (add / sub), 0): eliminate the subs used to update flag
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; for comparison only
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; rdar://10233472
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define i32 @t1(i64 %a) {
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; CHECK-LABEL: t1:
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; CHECK: // BB#0:
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; CHECK-NEXT: lsr x8, x0, #63
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; CHECK-NEXT: eor w0, w8, #0x1
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; CHECK-NEXT: ret
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;
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%cmp = icmp sgt i64 %a, -1
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%conv = zext i1 %cmp to i32
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ret i32 %conv
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}
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