| // RUN: %clang_cc1 %s -emit-llvm -o - | FileCheck %s |
| |
| int test__builtin_clrsb(int x) { |
| // CHECK-LABEL: test__builtin_clrsb |
| // CHECK: [[C:%.*]] = icmp slt i32 [[X:%.*]], 0 |
| // CHECK-NEXT: [[INV:%.*]] = xor i32 [[X]], -1 |
| // CHECK-NEXT: [[SEL:%.*]] = select i1 [[C]], i32 [[INV]], i32 [[X]] |
| // CHECK-NEXT: [[CTLZ:%.*]] = call i32 @llvm.ctlz.i32(i32 [[SEL]], i1 false) |
| // CHECK-NEXT: [[SUB:%.*]] = sub i32 [[CTLZ]], 1 |
| return __builtin_clrsb(x); |
| } |
| |
| int test__builtin_clrsbll(long long x) { |
| // CHECK-LABEL: test__builtin_clrsbll |
| // CHECK: [[C:%.*]] = icmp slt i64 [[X:%.*]], 0 |
| // CHECK-NEXT: [[INV:%.*]] = xor i64 [[X]], -1 |
| // CHECK-NEXT: [[SEL:%.*]] = select i1 [[C]], i64 [[INV]], i64 [[X]] |
| // CHECK-NEXT: [[CTLZ:%.*]] = call i64 @llvm.ctlz.i64(i64 [[SEL]], i1 false) |
| // CHECK-NEXT: [[SUB:%.*]] = sub i64 [[CTLZ]], 1 |
| // CHECK-NEXT: trunc i64 [[SUB]] to i32 |
| return __builtin_clrsbll(x); |
| } |
