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MSVC has a __cpuidex function implemented to call the underlying cpuid
instruction which accepts a leaf, subleaf, and data array that the output
data is written into. This patch adds this functionality into clang
under the cpuid.h header. This also makes clang match GCC's behavior.
GCC has had __cpuidex in its cpuid.h since 2020.
Repository:
rG LLVM Github Monorepo
https://reviews.llvm.org/D150646
Files:
clang/lib/Headers/cpuid.h
clang/test/Headers/cpuid.c
Index: clang/test/Headers/cpuid.c
===================================================================
--- clang/test/Headers/cpuid.c
+++ clang/test/Headers/cpuid.c
@@ -6,14 +6,19 @@
// 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/lib/Headers/cpuid.h
===================================================================
--- clang/lib/Headers/cpuid.h
+++ clang/lib/Headers/cpuid.h
@@ -328,4 +328,10 @@
return 1;
}
+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 /* __CPUID_H */
Index: clang/test/Headers/cpuid.c
===================================================================
--- clang/test/Headers/cpuid.c
+++ clang/test/Headers/cpuid.c
@@ -6,14 +6,19 @@
// 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/lib/Headers/cpuid.h
===================================================================
--- clang/lib/Headers/cpuid.h
+++ clang/lib/Headers/cpuid.h
@@ -328,4 +328,10 @@
return 1;
}
+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 /* __CPUID_H */
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