[PATCH] D157115: Revert "[clang][X86] Add __cpuidex function to cpuid.h"

[Aiden Grossman via Phabricator via cfe-commits]

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This reverts commit 2df77ac20a1ed996706b164b0c4ed5ad140f635f <https://reviews.llvm.org/rG2df77ac20a1ed996706b164b0c4ed5ad140f635f>.

This has been causing some issues with some windows builds as `_MSC_EXTENSIONS` isn't defined when only `-fms-extensions` is set, but the builtin that conflicts with __cpuidex is. This was also causing problems as it exposed some latent issues with how auxiliary triples are handled in clang.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D157115

Files:
  clang/lib/Headers/cpuid.h
  clang/test/Headers/__cpuidex_conflict.c
  clang/test/Headers/cpuid.c


Index: clang/test/Headers/cpuid.c
===================================================================
--- clang/test/Headers/cpuid.c
+++ clang/test/Headers/cpuid.c
@@ -6,19 +6,14 @@

 // CHECK-64: {{.*}} call { i32, i32, i32, i32 } asm "  xchgq  %rbx,${1:q}\0A cpuid\0A xchgq %rbx,${1:q}", "={ax},=r,={cx},={dx},0,~{dirflag},~{fpsr},~{flags}"(i32 %{{[a-z0-9]+}})
 // CHECK-64: {{.*}} call { i32, i32, i32, i32 } asm "  xchgq  %rbx,${1:q}\0A  cpuid\0A  xchgq  %rbx,${1:q}", "={ax},=r,={cx},={dx},0,2,~{dirflag},~{fpsr},~{flags}"(i32 %{{[a-z0-9]+}}, i32 %{{[a-z0-9]+}})
-// CHECK-64: {{.*}} call { i32, i32, i32, i32 } asm "  xchgq  %rbx,${1:q}\0A  cpuid\0A  xchgq  %rbx,${1:q}", "={ax},=r,={cx},={dx},0,2,~{dirflag},~{fpsr},~{flags}"(i32 %{{[a-z0-9]+}}, i32 %{{[a-z0-9]+}})

 // CHECK-32: {{.*}} call { i32, i32, i32, i32 } asm "cpuid", "={ax},={bx},={cx},={dx},0,~{dirflag},~{fpsr},~{flags}"(i32 %{{[a-z0-9]+}})
 // CHECK-32: {{.*}} call { i32, i32, i32, i32 } asm "cpuid", "={ax},={bx},={cx},={dx},0,2,~{dirflag},~{fpsr},~{flags}"(i32 %{{[a-z0-9]+}}, i32 %{{[a-z0-9]+}})
-// CHECK-32: {{.*}} call { i32, i32, i32, i32 } asm "cpuid", "={ax},={bx},={cx},={dx},0,2,~{dirflag},~{fpsr},~{flags}"(i32 %{{[a-z0-9]+}}, i32 %{{[a-z0-9]+}})

 unsigned eax0, ebx0, ecx0, edx0;
 unsigned eax1, ebx1, ecx1, edx1;

-int cpuid_info[4];
-
 void test_cpuid(unsigned level, unsigned count) {
   __cpuid(level, eax1, ebx1, ecx1, edx1);
   __cpuid_count(level, count, eax0, ebx0, ecx0, edx0);
-  __cpuidex(cpuid_info, level, count);
 }
Index: clang/test/Headers/__cpuidex_conflict.c
===================================================================
--- clang/test/Headers/__cpuidex_conflict.c
+++ /dev/null
@@ -1,15 +0,0 @@
-// Make sure that __cpuidex in cpuid.h doesn't conflict with the MS
-// compatibility built in by ensuring compilation succeeds:
-// RUN: %clang_cc1 %s -ffreestanding -fms-extensions -fms-compatibility \
-// RUN:  -fms-compatibility-version=19.00 -triple x86_64-pc-windows-msvc -emit-llvm -o -
-
-typedef __SIZE_TYPE__ size_t;
-
-#include <intrin.h>
-#include <cpuid.h>
-
-int cpuid_info[4];
-
-void test_cpuidex(unsigned level, unsigned count) {
-  __cpuidex(cpuid_info, level, count);
-}
Index: clang/lib/Headers/cpuid.h
===================================================================
--- clang/lib/Headers/cpuid.h
+++ clang/lib/Headers/cpuid.h
@@ -328,14 +328,4 @@
     return 1;
 }

-// If MS extensions are enabled, __cpuidex is defined as a builtin which will
-// conflict with the __cpuidex definition below.
-#ifndef _MSC_EXTENSIONS
-static __inline void __cpuidex (int __cpu_info[4], int __leaf, int __subleaf)
-{
-  __cpuid_count(__leaf, __subleaf, __cpu_info[0], __cpu_info[1], __cpu_info[2],
-                __cpu_info[3]);
-}
-#endif
-
 #endif /* __CPUID_H */


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