// RUN: %clang_cc1 -ffreestanding -triple x86_64-unknown-unknown -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]] | |
} |