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many versions of simdid

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This commit is contained in:
Youmu Liu
2026-02-25 18:02:56 +08:00
parent b71515b2d4
commit 1b04196314
6 changed files with 188 additions and 51 deletions
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StgSharp.Native/sn-src/simdid_compare.x86.c
+24 -8
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@@ -61,7 +61,7 @@ static int impl_strength(uint16_t avx512)
* - AVX features : bitwise AND
* - AVX10 features : bitwise AND
* - Root / Manu : keep left (must be same arch in practice)
* - uArchHi : min (most conservative policy)
* - uArchHi : bitwise OR (HYBRID_P/E union; SIMD_DUAL set if either core is dual)
* ----------------------------------------------------------------------- */
SN_API SIMDID SN_DECL sn_get_unite_simd(SIMDID left, SIMDID right)
{
@@ -102,10 +102,14 @@ SN_API SIMDID SN_DECL sn_get_unite_simd(SIMDID left, SIMDID right)
/* AVX10 (byte 6): AND */
out.make_byte[6] = left.make_byte[6] & right.make_byte[6];
/* uArchHi (byte 7): min */
/* uArchHi (byte 7):
* topology bits [1..0]: AND — conservative intersection (weaker topology wins)
* SIMD_DUAL bit [2]: OR — dual if either core is dual */
unsigned char lu = FIELD_UARCH(left);
unsigned char ru = FIELD_UARCH(right);
out.make_byte[7] = (char)(lu < ru ? lu : ru);
unsigned char topo = (lu & 0x3u) & (ru & 0x3u);
unsigned char dual = (lu | ru) & (unsigned char)SIMDID_UARCH_SIMD_DUAL;
out.make_byte[7] = (char)(topo | dual);
return out;
}
@@ -142,8 +146,12 @@ SN_API SIMDID SN_DECL sn_get_unite_simd(SIMDID left, SIMDID right)
* DUAL(weakest) < UNKNOWN < NATIVE(strongest).
* This is not ISA capability but execution-width risk.
*
* 6. uArchHi (final tie-break)
* Higher value = more specific / stronger policy hint.
* 6. uArchHi topology bits [1..0]
* Numeric value: unified(11=3) > P-core(10=2) > E-core(01=1) > unknown(00=0).
* Higher value = stronger / higher-capability core form.
*
* 7. uArchHi SIMD_DUAL (final tie-break)
* Non-dual (SIMD_DUAL=0) > dual (SIMD_DUAL=1).
* ----------------------------------------------------------------------- */
SN_API int SN_DECL sn_compare_simd(SIMDID left, SIMDID right)
{
@@ -186,11 +194,19 @@ SN_API int SN_DECL sn_compare_simd(SIMDID left, SIMDID right)
return ls > rs ? 1 : -1;
}
/* 6. uArchHi (final tie-break) */
/* 6. uArchHi topology bits [1..0]: unified(3) > P(2) > E(1) > unknown(0) */
unsigned lu = FIELD_UARCH(left);
unsigned ru = FIELD_UARCH(right);
if (lu != ru)
return lu > ru ? 1 : -1;
unsigned lt = lu & 0x3u;
unsigned rt = ru & 0x3u;
if (lt != rt)
return lt > rt ? 1 : -1;
/* 7. uArchHi SIMD_DUAL: non-dual (SIMD_DUAL=0) > dual (SIMD_DUAL=1) */
int ld = (lu & SIMDID_UARCH_SIMD_DUAL) != 0;
int rd = (ru & SIMDID_UARCH_SIMD_DUAL) != 0;
if (ld != rd)
return ld ? -1 : 1; /* non-dual is stronger */
return 0;
}