55 lines
1.1 KiB
LLVM
55 lines
1.1 KiB
LLVM
; RUN: opt < %s -instcombine -S | FileCheck %s
|
|
|
|
target triple = "x86_64-unknown-freebsd11.0"
|
|
|
|
define i32 @myfls() {
|
|
; CHECK-LABEL: @myfls(
|
|
; CHECK-NEXT: ret i32 6
|
|
;
|
|
%call = call i32 @fls(i32 42)
|
|
ret i32 %call
|
|
}
|
|
|
|
define i32 @myflsl() {
|
|
; CHECK-LABEL: @myflsl(
|
|
; CHECK-NEXT: ret i32 6
|
|
;
|
|
%patatino = call i32 @flsl(i64 42)
|
|
ret i32 %patatino
|
|
}
|
|
|
|
define i32 @myflsll() {
|
|
; CHECK-LABEL: @myflsll(
|
|
; CHECK-NEXT: ret i32 6
|
|
;
|
|
%whatever = call i32 @flsll(i64 42)
|
|
ret i32 %whatever
|
|
}
|
|
|
|
; Lower to llvm.ctlz() if the argument is not a constant
|
|
|
|
define i32 @flsnotconst(i64 %z) {
|
|
; CHECK-LABEL: @flsnotconst(
|
|
; CHECK-NEXT: [[CTLZ:%.*]] = call i64 @llvm.ctlz.i64(i64 %z, i1 false), !range !0
|
|
; CHECK-NEXT: [[TMP1:%.*]] = trunc i64 [[CTLZ]] to i32
|
|
; CHECK-NEXT: [[TMP2:%.*]] = sub nsw i32 64, [[TMP1]]
|
|
; CHECK-NEXT: ret i32 [[TMP2]]
|
|
;
|
|
%goo = call i32 @flsl(i64 %z)
|
|
ret i32 %goo
|
|
}
|
|
|
|
; Make sure we lower fls(0) to 0 and not to `undef`.
|
|
|
|
define i32 @flszero() {
|
|
; CHECK-LABEL: @flszero(
|
|
; CHECK-NEXT: ret i32 0
|
|
;
|
|
%zero = call i32 @fls(i32 0)
|
|
ret i32 %zero
|
|
}
|
|
|
|
declare i32 @fls(i32)
|
|
declare i32 @flsl(i64)
|
|
declare i32 @flsll(i64)
|