File: bitscan-builtins.c

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// RUN: %clang_cc1 -ffreestanding -triple x86_64-unknown-unknown -emit-llvm -o - %s | FileCheck %s

// PR33722
// RUN: %clang_cc1 -ffreestanding -triple x86_64-unknown-unknown -fms-extensions -fms-compatibility-version=19.00 -emit-llvm -o - %s | FileCheck %s

#include <immintrin.h>

int test_bit_scan_forward(int a) {
  return _bit_scan_forward(a);
// CHECK: @test_bit_scan_forward
// CHECK: %[[call:.*]] = call i32 @llvm.cttz.i32(
// CHECK: ret i32 %[[call]]
}

int test_bit_scan_reverse(int a) {
  return _bit_scan_reverse(a);
// CHECK:  %[[call:.*]] = call i32 @llvm.ctlz.i32(
// CHECK:  %[[sub:.*]] = sub nsw i32 31, %[[call]]
// CHECK: ret i32 %[[sub]]
}