84 lines
2.2 KiB
Diff
84 lines
2.2 KiB
Diff
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From 56dbde07b05252f0b304b04040a86cfb9f109ae9 Mon Sep 17 00:00:00 2001
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From: Zoltan Herczeg <hzmester@freemail.hu>
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Date: Sat, 23 Mar 2024 07:51:02 +0000
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Subject: [PATCH] Add xgetbv feature detection support on x86
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---
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sljit_src/sljitNativeX86_common.c | 42 +++++++++++++++++++++++++++++++
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1 file changed, 42 insertions(+)
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diff --git a/sljit_src/sljitNativeX86_common.c b/sljit_src/sljitNativeX86_common.c
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index 3d5c02b7..de519e6b 100644
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--- a/sljit_src/sljitNativeX86_common.c
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+++ b/sljit_src/sljitNativeX86_common.c
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@@ -391,6 +391,7 @@ static const sljit_u8 freg_lmap[SLJIT_NUMBER_OF_FLOAT_REGISTERS + 2] = {
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#define CPU_FEATURE_CMOV 0x020
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#define CPU_FEATURE_AVX 0x040
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#define CPU_FEATURE_AVX2 0x080
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+#define CPU_FEATURE_OSXSAVE 0x100
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static sljit_u32 cpu_feature_list = 0;
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@@ -491,6 +492,42 @@ static void execute_cpu_id(sljit_u32 info[4])
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#endif /* _MSC_VER && _MSC_VER >= 1400 */
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}
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+static sljit_u32 execute_get_xcr0_low(void)
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+{
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+ sljit_u32 xcr0;
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+
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+#if defined(_MSC_VER) && _MSC_VER >= 1400
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+
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+ xcr0 = (sljit_u32)_xgetbv(0);
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+
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+#elif defined(__GNUC__) || defined(__INTEL_COMPILER) || defined(__SUNPRO_C) || defined(__TINYC__)
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+
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+ /* AT&T syntax. */
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+ __asm__ (
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+ "xorl %%ecx, %%ecx\n"
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+ "xgetbv\n"
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+ : "=a" (xcr0)
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+ :
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+#if (defined SLJIT_CONFIG_X86_32 && SLJIT_CONFIG_X86_32)
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+ : "ecx", "edx"
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+#else /* !SLJIT_CONFIG_X86_32 */
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+ : "rcx", "rdx"
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+#endif /* SLJIT_CONFIG_X86_32 */
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+ );
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+
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+#else /* _MSC_VER < 1400 */
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+
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+ /* Intel syntax. */
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+ __asm {
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+ mov ecx, 0
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+ xgetbv
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+ mov xcr0, eax
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+ }
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+
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+#endif /* _MSC_VER && _MSC_VER >= 1400 */
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+ return xcr0;
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+}
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+
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static void get_cpu_features(void)
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{
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sljit_u32 feature_list = CPU_FEATURE_DETECTED;
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@@ -518,6 +555,8 @@ static void get_cpu_features(void)
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if (info[2] & 0x80000)
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feature_list |= CPU_FEATURE_SSE41;
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+ if (info[2] & 0x8000000)
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+ feature_list |= CPU_FEATURE_OSXSAVE;
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if (info[2] & 0x10000000)
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feature_list |= CPU_FEATURE_AVX;
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#if (defined SLJIT_DETECT_SSE2 && SLJIT_DETECT_SSE2)
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@@ -535,6 +574,9 @@ static void get_cpu_features(void)
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if (info[2] & 0x20)
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feature_list |= CPU_FEATURE_LZCNT;
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+ if ((feature_list & CPU_FEATURE_OSXSAVE) && (execute_get_xcr0_low() & 0x4) == 0)
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+ feature_list &= ~(sljit_u32)(CPU_FEATURE_AVX | CPU_FEATURE_AVX2);
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+
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cpu_feature_list = feature_list;
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}
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