| ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py |
| ; RUN: opt -passes=aggressive-instcombine -S < %s | FileCheck %s |
| |
| @ctz1.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 |
| |
| define i32 @ctz1(i32 %x) { |
| ; CHECK-LABEL: @ctz1( |
| ; CHECK-NEXT: entry: |
| ; CHECK-NEXT: [[TMP0:%.*]] = call i32 @llvm.cttz.i32(i32 [[X:%.*]], i1 true) |
| ; CHECK-NEXT: [[TMP1:%.*]] = icmp eq i32 [[X]], 0 |
| ; CHECK-NEXT: [[TMP2:%.*]] = select i1 [[TMP1]], i32 0, i32 [[TMP0]] |
| ; CHECK-NEXT: [[TMP3:%.*]] = trunc i32 [[TMP2]] to i8 |
| ; CHECK-NEXT: [[CONV:%.*]] = zext i8 [[TMP3]] to i32 |
| ; CHECK-NEXT: ret i32 [[CONV]] |
| ; |
| entry: |
| %sub = sub i32 0, %x |
| %and = and i32 %sub, %x |
| %mul = mul i32 %and, 125613361 |
| %shr = lshr i32 %mul, 27 |
| %idxprom = zext i32 %shr to i64 |
| %arrayidx = getelementptr inbounds [32 x i8], ptr @ctz1.table, i64 0, i64 %idxprom |
| %0 = load i8, ptr %arrayidx, align 1 |
| %conv = zext i8 %0 to i32 |
| ret i32 %conv |
| } |
