1 ; RUN: opt -S -simplifycfg -mtriple=x86_64-unknown-unknown -mattr=+bmi < %s | FileCheck %s --check-prefix=ALL --check-prefix=BMI
2 ; RUN: opt -S -simplifycfg -mtriple=x86_64-unknown-unknown -mattr=+lzcnt < %s | FileCheck %s --check-prefix=ALL --check-prefix=LZCNT
3 ; RUN: opt -S -simplifycfg -mtriple=x86_64-unknown-unknown < %s | FileCheck %s --check-prefix=ALL --check-prefix=GENERIC
6 define i64 @test1(i64 %A) {
8 ; ALL: [[COND:%[A-Za-z0-9]+]] = icmp eq i64 %A, 0
9 ; ALL: [[CTLZ:%[A-Za-z0-9]+]] = tail call i64 @llvm.ctlz.i64(i64 %A, i1 true)
10 ; LZCNT-NEXT: select i1 [[COND]], i64 64, i64 [[CTLZ]]
15 %tobool = icmp eq i64 %A, 0
16 br i1 %tobool, label %cond.end, label %cond.true
18 cond.true: ; preds = %entry
19 %0 = tail call i64 @llvm.ctlz.i64(i64 %A, i1 true)
22 cond.end: ; preds = %entry, %cond.true
23 %cond = phi i64 [ %0, %cond.true ], [ 64, %entry ]
27 define i32 @test2(i32 %A) {
29 ; ALL: [[COND:%[A-Za-z0-9]+]] = icmp eq i32 %A, 0
30 ; ALL: [[CTLZ:%[A-Za-z0-9]+]] = tail call i32 @llvm.ctlz.i32(i32 %A, i1 true)
31 ; LZCNT-NEXT: select i1 [[COND]], i32 32, i32 [[CTLZ]]
36 %tobool = icmp eq i32 %A, 0
37 br i1 %tobool, label %cond.end, label %cond.true
39 cond.true: ; preds = %entry
40 %0 = tail call i32 @llvm.ctlz.i32(i32 %A, i1 true)
43 cond.end: ; preds = %entry, %cond.true
44 %cond = phi i32 [ %0, %cond.true ], [ 32, %entry ]
49 define signext i16 @test3(i16 signext %A) {
51 ; ALL: [[COND:%[A-Za-z0-9]+]] = icmp eq i16 %A, 0
52 ; ALL: [[CTLZ:%[A-Za-z0-9]+]] = tail call i16 @llvm.ctlz.i16(i16 %A, i1 true)
53 ; LZCNT-NEXT: select i1 [[COND]], i16 16, i16 [[CTLZ]]
58 %tobool = icmp eq i16 %A, 0
59 br i1 %tobool, label %cond.end, label %cond.true
61 cond.true: ; preds = %entry
62 %0 = tail call i16 @llvm.ctlz.i16(i16 %A, i1 true)
65 cond.end: ; preds = %entry, %cond.true
66 %cond = phi i16 [ %0, %cond.true ], [ 16, %entry ]
71 define i64 @test1b(i64 %A) {
73 ; ALL: [[COND:%[A-Za-z0-9]+]] = icmp eq i64 %A, 0
74 ; ALL: [[CTTZ:%[A-Za-z0-9]+]] = tail call i64 @llvm.cttz.i64(i64 %A, i1 true)
75 ; BMI-NEXT: select i1 [[COND]], i64 64, i64 [[CTTZ]]
80 %tobool = icmp eq i64 %A, 0
81 br i1 %tobool, label %cond.end, label %cond.true
83 cond.true: ; preds = %entry
84 %0 = tail call i64 @llvm.cttz.i64(i64 %A, i1 true)
87 cond.end: ; preds = %entry, %cond.true
88 %cond = phi i64 [ %0, %cond.true ], [ 64, %entry ]
93 define i32 @test2b(i32 %A) {
95 ; ALL: [[COND:%[A-Za-z0-9]+]] = icmp eq i32 %A, 0
96 ; ALL: [[CTTZ:%[A-Za-z0-9]+]] = tail call i32 @llvm.cttz.i32(i32 %A, i1 true)
97 ; BMI-NEXT: select i1 [[COND]], i32 32, i32 [[CTTZ]]
102 %tobool = icmp eq i32 %A, 0
103 br i1 %tobool, label %cond.end, label %cond.true
105 cond.true: ; preds = %entry
106 %0 = tail call i32 @llvm.cttz.i32(i32 %A, i1 true)
109 cond.end: ; preds = %entry, %cond.true
110 %cond = phi i32 [ %0, %cond.true ], [ 32, %entry ]
115 define signext i16 @test3b(i16 signext %A) {
116 ; ALL-LABEL: @test3b(
117 ; ALL: [[COND:%[A-Za-z0-9]+]] = icmp eq i16 %A, 0
118 ; ALL: [[CTTZ:%[A-Za-z0-9]+]] = tail call i16 @llvm.cttz.i16(i16 %A, i1 true)
119 ; BMI-NEXT: select i1 [[COND]], i16 16, i16 [[CTTZ]]
121 ; GENERIC-NOT: select
124 %tobool = icmp eq i16 %A, 0
125 br i1 %tobool, label %cond.end, label %cond.true
127 cond.true: ; preds = %entry
128 %0 = tail call i16 @llvm.cttz.i16(i16 %A, i1 true)
131 cond.end: ; preds = %entry, %cond.true
132 %cond = phi i16 [ %0, %cond.true ], [ 16, %entry ]
136 declare i64 @llvm.ctlz.i64(i64, i1)
137 declare i32 @llvm.ctlz.i32(i32, i1)
138 declare i16 @llvm.ctlz.i16(i16, i1)
139 declare i64 @llvm.cttz.i64(i64, i1)
140 declare i32 @llvm.cttz.i32(i32, i1)
141 declare i16 @llvm.cttz.i16(i16, i1)