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f7efb97beb
Legalize/select llvm.ctlz.* Add select-ctlz to show that we actually select them. Update arm64-clrsb.ll and arm64-vclz.ll to show that we perform valid transformations in optimized builds, and document where GISel can improve. Differential Revision: https://reviews.llvm.org/D58155 llvm-svn: 354299
46 lines
1.3 KiB
LLVM
46 lines
1.3 KiB
LLVM
; RUN: llc < %s -mtriple=arm64-apple-ios7.0.0 | FileCheck %s
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; RUN: llc < %s -mtriple=arm64-apple-ios7.0.0 -O0 -pass-remarks-missed=gisel* -global-isel-abort=2 | FileCheck %s --check-prefixes=GISEL,FALLBACK
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target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128"
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; Function Attrs: nounwind readnone
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declare i32 @llvm.ctlz.i32(i32, i1) #0
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declare i64 @llvm.ctlz.i64(i64, i1) #1
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; Function Attrs: nounwind ssp
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; FALLBACK-NOT: remark{{.*}}clrsb32
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define i32 @clrsb32(i32 %x) #2 {
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entry:
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%shr = ashr i32 %x, 31
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%xor = xor i32 %shr, %x
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%mul = shl i32 %xor, 1
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%add = or i32 %mul, 1
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%0 = tail call i32 @llvm.ctlz.i32(i32 %add, i1 false)
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ret i32 %0
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; CHECK-LABEL: clrsb32
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; CHECK: cls [[TEMP:w[0-9]+]], [[TEMP]]
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; FIXME: We should produce the same result here to save some code size. After
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; that, we can remove the GISEL special casing.
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; GISEL-LABEL: clrsb32
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; GISEL: clz
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}
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; Function Attrs: nounwind ssp
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; FALLBACK-NOT: remark{{.*}}clrsb64
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define i64 @clrsb64(i64 %x) #3 {
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entry:
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%shr = ashr i64 %x, 63
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%xor = xor i64 %shr, %x
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%mul = shl nsw i64 %xor, 1
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%add = or i64 %mul, 1
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%0 = tail call i64 @llvm.ctlz.i64(i64 %add, i1 false)
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ret i64 %0
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; CHECK-LABEL: clrsb64
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; CHECK: cls [[TEMP:x[0-9]+]], [[TEMP]]
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; GISEL-LABEL: clrsb64
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; GISEL: cls [[TEMP:x[0-9]+]], [[TEMP]]
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}
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