From: Haochen Jiang <haochen.jiang@intel.com>
Date: Tue, 9 Jul 2024 08:31:02 +0000 (+0800)
Subject: i386: Correct AVX10 CPUID emulation
X-Git-Tag: basepoints/gcc-16~7645
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=298a576f00c49b8f4529ea2f87b9943a32743250;p=thirdparty%2Fgcc.git

i386: Correct AVX10 CPUID emulation

AVX10 Documentaion has specified ecx value as 0 for AVX10 version and
vector size under 0x24 subleaf. Although for ecx=1, the bits are all
reserved for now, we still need to specify ecx as 0 to avoid dirty
value in ecx.

gcc/ChangeLog:

	* common/config/i386/cpuinfo.h (get_available_features): Correct
	AVX10 CPUID emulation to specify ecx value.
---

diff --git a/gcc/common/config/i386/cpuinfo.h b/gcc/common/config/i386/cpuinfo.h
index 936039725ab..2ae77d335d2 100644
--- a/gcc/common/config/i386/cpuinfo.h
+++ b/gcc/common/config/i386/cpuinfo.h
@@ -998,10 +998,10 @@ get_available_features (struct __processor_model *cpu_model,
 	}
     }
 
-  /* Get Advanced Features at level 0x24 (eax = 0x24).  */
+  /* Get Advanced Features at level 0x24 (eax = 0x24, ecx = 0).  */
   if (avx10_set && max_cpuid_level >= 0x24)
     {
-      __cpuid (0x24, eax, ebx, ecx, edx);
+      __cpuid_count (0x24, 0, eax, ebx, ecx, edx);
       version = ebx & 0xff;
       if (ebx & bit_AVX10_256)
 	switch (version)