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https://github.com/Gericom/teak-llvm.git
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b521dc3acf
Clang/LLVM doesn't have a way to pass an HLE hint through to the X86 backend to emit HLE prefixed instructions. So this is a good short term fix. Differential Revision: https://reviews.llvm.org/D47672 llvm-svn: 334751
21 lines
661 B
C
21 lines
661 B
C
// RUN: %clang_cc1 -ffreestanding -triple x86_64-unknown-unknown -emit-llvm -o - %s | FileCheck %s
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// PR33722
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// RUN: %clang_cc1 -ffreestanding -triple x86_64-unknown-unknown -fms-extensions -fms-compatibility-version=19.00 -emit-llvm -o - %s | FileCheck %s
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#include <immintrin.h>
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int test_bit_scan_forward(int a) {
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return _bit_scan_forward(a);
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// CHECK: @test_bit_scan_forward
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// CHECK: %[[call:.*]] = call i32 @llvm.cttz.i32(
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// CHECK: ret i32 %[[call]]
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}
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int test_bit_scan_reverse(int a) {
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return _bit_scan_reverse(a);
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// CHECK: %[[call:.*]] = call i32 @llvm.ctlz.i32(
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// CHECK: %[[sub:.*]] = sub nsw i32 31, %[[call]]
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// CHECK: ret i32 %[[sub]]
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}
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