forked from OSchip/llvm-project
46 lines
1.3 KiB
LLVM
46 lines
1.3 KiB
LLVM
; RUN: llc < %s -mtriple=arm64-apple-ios7.0.0 | FileCheck %s
|
|
; RUN: llc < %s -mtriple=arm64-apple-ios7.0.0 -O0 -pass-remarks-missed=gisel* -global-isel-abort=2 | FileCheck %s --check-prefixes=GISEL,FALLBACK
|
|
|
|
target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128"
|
|
|
|
; Function Attrs: nounwind readnone
|
|
declare i32 @llvm.ctlz.i32(i32, i1) #0
|
|
declare i64 @llvm.ctlz.i64(i64, i1) #1
|
|
|
|
; Function Attrs: nounwind ssp
|
|
; FALLBACK-NOT: remark{{.*}}clrsb32
|
|
define i32 @clrsb32(i32 %x) #2 {
|
|
entry:
|
|
%shr = ashr i32 %x, 31
|
|
%xor = xor i32 %shr, %x
|
|
%mul = shl i32 %xor, 1
|
|
%add = or i32 %mul, 1
|
|
%0 = tail call i32 @llvm.ctlz.i32(i32 %add, i1 false)
|
|
|
|
ret i32 %0
|
|
; CHECK-LABEL: clrsb32
|
|
; CHECK: cls [[TEMP:w[0-9]+]], [[TEMP]]
|
|
|
|
; FIXME: We should produce the same result here to save some code size. After
|
|
; that, we can remove the GISEL special casing.
|
|
; GISEL-LABEL: clrsb32
|
|
; GISEL: clz
|
|
}
|
|
|
|
; Function Attrs: nounwind ssp
|
|
; FALLBACK-NOT: remark{{.*}}clrsb64
|
|
define i64 @clrsb64(i64 %x) #3 {
|
|
entry:
|
|
%shr = ashr i64 %x, 63
|
|
%xor = xor i64 %shr, %x
|
|
%mul = shl nsw i64 %xor, 1
|
|
%add = or i64 %mul, 1
|
|
%0 = tail call i64 @llvm.ctlz.i64(i64 %add, i1 false)
|
|
|
|
ret i64 %0
|
|
; CHECK-LABEL: clrsb64
|
|
; CHECK: cls [[TEMP:x[0-9]+]], [[TEMP]]
|
|
; GISEL-LABEL: clrsb64
|
|
; GISEL: cls [[TEMP:x[0-9]+]], [[TEMP]]
|
|
}
|