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https://github.com/Gericom/teak-llvm.git
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88f4054f48
Summary: These are all implemented by icc as well. I made bit_scan_forward/reverse forward to the __bsfd/__bsrq since we also have __bsfq/__bsrq. Note, when lzcnt is enabled the bsr intrinsics generates lzcnt+xor instead of bsr. Reviewers: RKSimon, spatel Subscribers: cfe-commits, llvm-commits Tags: #clang Differential Revision: https://reviews.llvm.org/D59682 llvm-svn: 356848
48 lines
1.4 KiB
C
48 lines
1.4 KiB
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 <x86intrin.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(i32 %{{.*}}, i1 true)
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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(i32 %{{.*}}, i1 true)
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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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int test__bsfd(int X) {
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// CHECK: @test__bsfd
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// CHECK: %[[call:.*]] = call i32 @llvm.cttz.i32(i32 %{{.*}}, i1 true)
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return __bsfd(X);
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}
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int test__bsfq(long long X) {
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// CHECK: @test__bsfq
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// CHECK: %[[call:.*]] = call i64 @llvm.cttz.i64(i64 %{{.*}}, i1 true)
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return __bsfq(X);
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}
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int test__bsrd(int X) {
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// CHECK: @test__bsrd
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// CHECK: %[[call:.*]] = call i32 @llvm.ctlz.i32(i32 %{{.*}}, i1 true)
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// CHECK: %[[sub:.*]] = sub nsw i32 31, %[[call]]
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return __bsrd(X);
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}
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int test__bsrq(long long X) {
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// CHECK: @test__bsrq
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// CHECK: %[[call:.*]] = call i64 @llvm.ctlz.i64(i64 %{{.*}}, i1 true)
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// CHECK: %[[cast:.*]] = trunc i64 %[[call]] to i32
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// CHECK: %[[sub:.*]] = sub nsw i32 63, %[[cast]]
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return __bsrq(X);
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}
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