/
ffs-i16.ll
35 lines (28 loc) · 1.04 KB
/
ffs-i16.ll
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
;
; Test that the ffs library call simplifier works correctly even for
; targets with 16-bit int.
;
; RUN: opt < %s -mtriple=avr-linux -passes=instcombine -S | FileCheck %s
; RUN: opt < %s -mtriple=msp430-linux -passes=instcombine -S | FileCheck %s
declare i16 @ffs(i16)
declare void @sink(i16)
define void @fold_ffs(i16 %x) {
; CHECK-LABEL: @fold_ffs(
; CHECK-NEXT: call void @sink(i16 0)
; CHECK-NEXT: call void @sink(i16 1)
; CHECK-NEXT: [[CTTZ:%.*]] = call i16 @llvm.cttz.i16(i16 [[X:%.*]], i1 true), !range [[RNG0:![0-9]+]]
; CHECK-NEXT: [[TMP1:%.*]] = add nuw nsw i16 [[CTTZ]], 1
; CHECK-NEXT: [[DOTNOT:%.*]] = icmp eq i16 [[X]], 0
; CHECK-NEXT: [[TMP2:%.*]] = select i1 [[DOTNOT]], i16 0, i16 [[TMP1]]
; CHECK-NEXT: call void @sink(i16 [[TMP2]])
; CHECK-NEXT: ret void
;
%n0 = call i16 @ffs(i16 0)
call void @sink(i16 %n0)
%n1 = call i16 @ffs(i16 1)
call void @sink(i16 %n1)
%nx = call i16 @ffs(i16 %x)
call void @sink(i16 %nx)
ret void
}