1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2; RUN: opt -passes=aggressive-instcombine -S < %s | FileCheck %s
3
4;; C reproducers:
5;; #include "stdio.h"
6;; unsigned x;
7;;
8;; int test ()
9;; {
10;;  static const char table[32] =
11;;    {
12;;      0, 1, 28, 2, 29, 14, 24, 3, 30, 22, 20, 15, 25, 17, 4, 8,
13;;      31, 27, 13, 23, 21, 19, 16, 7, 26, 12, 18, 6, 11, 5, 10, 9
14;;    };
15;;  return table[((unsigned)((x & -x) * 0x077CB531U)) >> 27];
16;; }
17;;
18
19@x = global i32 0, align 4
20@.str = private constant [3 x i8] c"%u\00", align 1
21@test.table = internal constant [32 x i8] c"\00\01\1C\02\1D\0E\18\03\1E\16\14\0F\19\11\04\08\1F\1B\0D\17\15\13\10\07\1A\0C\12\06\0B\05\0A\09", align 1
22
23define i32 @test() {
24; CHECK-LABEL: @test(
25; CHECK-NEXT:  entry:
26; CHECK-NEXT:    [[TMP0:%.*]] = load i32, ptr @x, align 4
27; CHECK-NEXT:    [[TMP1:%.*]] = call i32 @llvm.cttz.i32(i32 [[TMP0]], i1 true)
28; CHECK-NEXT:    [[TMP2:%.*]] = icmp eq i32 [[TMP0]], 0
29; CHECK-NEXT:    [[TMP3:%.*]] = select i1 [[TMP2]], i32 0, i32 [[TMP1]]
30; CHECK-NEXT:    [[TMP4:%.*]] = trunc i32 [[TMP3]] to i8
31; CHECK-NEXT:    [[CONV:%.*]] = zext i8 [[TMP4]] to i32
32; CHECK-NEXT:    ret i32 [[CONV]]
33;
34entry:
35  %0 = load i32, ptr @x, align 4
36  %sub = sub i32 0, %0
37  %and = and i32 %0, %sub
38  %mul = mul i32 %and, 125613361
39  %shr = lshr i32 %mul, 27
40  %idxprom = zext i32 %shr to i64
41  %arrayidx = getelementptr inbounds [32 x i8], ptr @test.table, i64 0, i64 %idxprom
42  %1 = load i8, ptr %arrayidx, align 1
43  %conv = zext i8 %1 to i32
44  ret i32 %conv
45}
46