| Sanjay Patel | af1b48b | 2015-11-10 19:24:31 +0000 | [diff] [blame^] | 1 | ; RUN: opt -S -simplifycfg -mtriple=arm -mattr=+v6t2 < %s | FileCheck %s |
| 2 | |
| 3 | define i32 @ctlz(i32 %A) { |
| 4 | ; CHECK-LABEL: @ctlz( |
| 5 | ; CHECK: [[ICMP:%[A-Za-z0-9]+]] = icmp eq i32 %A, 0 |
| 6 | ; CHECK-NEXT: [[CTZ:%[A-Za-z0-9]+]] = tail call i32 @llvm.ctlz.i32(i32 %A, i1 true) |
| 7 | ; CHECK-NEXT: [[SEL:%[A-Za-z0-9.]+]] = select i1 [[ICMP]], i32 32, i32 [[CTZ]] |
| 8 | ; CHECK-NEXT: ret i32 [[SEL]] |
| 9 | entry: |
| 10 | %tobool = icmp eq i32 %A, 0 |
| 11 | br i1 %tobool, label %cond.end, label %cond.true |
| 12 | |
| 13 | cond.true: |
| 14 | %0 = tail call i32 @llvm.ctlz.i32(i32 %A, i1 true) |
| 15 | br label %cond.end |
| 16 | |
| 17 | cond.end: |
| 18 | %cond = phi i32 [ %0, %cond.true ], [ 32, %entry ] |
| 19 | ret i32 %cond |
| 20 | } |
| 21 | |
| 22 | define i32 @cttz(i32 %A) { |
| 23 | ; CHECK-LABEL: @cttz( |
| 24 | ; CHECK: [[ICMP:%[A-Za-z0-9]+]] = icmp eq i32 %A, 0 |
| 25 | ; CHECK-NEXT: [[CTZ:%[A-Za-z0-9]+]] = tail call i32 @llvm.cttz.i32(i32 %A, i1 true) |
| 26 | ; CHECK-NEXT: [[SEL:%[A-Za-z0-9.]+]] = select i1 [[ICMP]], i32 32, i32 [[CTZ]] |
| 27 | ; CHECK-NEXT: ret i32 [[SEL]] |
| 28 | entry: |
| 29 | %tobool = icmp eq i32 %A, 0 |
| 30 | br i1 %tobool, label %cond.end, label %cond.true |
| 31 | |
| 32 | cond.true: |
| 33 | %0 = tail call i32 @llvm.cttz.i32(i32 %A, i1 true) |
| 34 | br label %cond.end |
| 35 | |
| 36 | cond.end: |
| 37 | %cond = phi i32 [ %0, %cond.true ], [ 32, %entry ] |
| 38 | ret i32 %cond |
| 39 | } |
| 40 | |
| 41 | declare i32 @llvm.ctlz.i32(i32, i1) |
| 42 | declare i32 @llvm.cttz.i32(i32, i1) |
| 43 | |