1 // RUN: %clang_cc1 -triple x86_64-unknown-unknown -emit-llvm -o - %s | FileCheck %s 2 3 // Don't include mm_malloc.h, it's system specific. 4 #define __MM_MALLOC_H 5 #include <immintrin.h> 6 7 int test_bit_scan_forward(int a) { 8 return _bit_scan_forward(a); 9 // CHECK: @test_bit_scan_forward 10 // CHECK: %[[call:.*]] = call i32 @llvm.cttz.i32( 11 // CHECK: ret i32 %[[call]] 12 } 13 14 int test_bit_scan_reverse(int a) { 15 return _bit_scan_reverse(a); 16 // CHECK: %[[call:.*]] = call i32 @llvm.ctlz.i32( 17 // CHECK: %[[sub:.*]] = sub nsw i32 31, %[[call]] 18 // CHECK: ret i32 %[[sub]] 19 } 20
