forked from OSchip/llvm-project
57 lines
1.7 KiB
LLVM
57 lines
1.7 KiB
LLVM
|
; RUN: opt -S -codegenprepare < %s | FileCheck %s --check-prefix=SLOW
|
||
|
|
; RUN: opt -S -codegenprepare -mattr=+bmi < %s | FileCheck %s --check-prefix=FAST_TZ
|
||
|
|
; RUN: opt -S -codegenprepare -mattr=+lzcnt < %s | FileCheck %s --check-prefix=FAST_LZ
|
||
|
|
|
||
|
|
target triple = "x86_64-unknown-unknown"
|
||
|
|
target datalayout = "e-n32:64"
|
||
|
|
|
||
|
|
; If the intrinsic is cheap, nothing should change.
|
||
|
|
; If the intrinsic is expensive, check if the input is zero to avoid the call.
|
||
|
|
; This is undoing speculation that may have been created by SimplifyCFG + InstCombine.
|
||
|
|
|
||
|
|
define i64 @cttz(i64 %A) {
|
||
|
|
entry:
|
||
|
|
%z = call i64 @llvm.cttz.i64(i64 %A, i1 false)
|
||
|
|
ret i64 %z
|
||
|
|
|
||
|
|
; SLOW-LABEL: @cttz(
|
||
|
|
; SLOW: entry:
|
||
|
|
; SLOW: %cmpz = icmp eq i64 %A, 0
|
||
|
|
; SLOW: br i1 %cmpz, label %cond.end, label %cond.false
|
||
|
|
; SLOW: cond.false:
|
||
|
|
; SLOW: %z = call i64 @llvm.cttz.i64(i64 %A, i1 true)
|
||
|
|
; SLOW: br label %cond.end
|
||
|
|
; SLOW: cond.end:
|
||
|
|
; SLOW: %ctz = phi i64 [ 64, %entry ], [ %z, %cond.false ]
|
||
|
|
; SLOW: ret i64 %ctz
|
||
|
|
|
||
|
|
; FAST_TZ-LABEL: @cttz(
|
||
|
|
; FAST_TZ: %z = call i64 @llvm.cttz.i64(i64 %A, i1 false)
|
||
|
|
; FAST_TZ: ret i64 %z
|
||
|
|
}
|
||
|
|
|
||
|
|
define i64 @ctlz(i64 %A) {
|
||
|
|
entry:
|
||
|
|
%z = call i64 @llvm.ctlz.i64(i64 %A, i1 false)
|
||
|
|
ret i64 %z
|
||
|
|
|
||
|
|
; SLOW-LABEL: @ctlz(
|
||
|
|
; SLOW: entry:
|
||
|
|
; SLOW: %cmpz = icmp eq i64 %A, 0
|
||
|
|
; SLOW: br i1 %cmpz, label %cond.end, label %cond.false
|
||
|
|
; SLOW: cond.false:
|
||
|
|
; SLOW: %z = call i64 @llvm.ctlz.i64(i64 %A, i1 true)
|
||
|
|
; SLOW: br label %cond.end
|
||
|
|
; SLOW: cond.end:
|
||
|
|
; SLOW: %ctz = phi i64 [ 64, %entry ], [ %z, %cond.false ]
|
||
|
|
; SLOW: ret i64 %ctz
|
||
|
|
|
||
|
|
; FAST_LZ-LABEL: @ctlz(
|
||
|
|
; FAST_LZ: %z = call i64 @llvm.ctlz.i64(i64 %A, i1 false)
|
||
|
|
; FAST_LZ: ret i64 %z
|
||
|
|
}
|
||
|
|
|
||
|
|
declare i64 @llvm.cttz.i64(i64, i1)
|
||
|
|
declare i64 @llvm.ctlz.i64(i64, i1)
|
||
|
|
|