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x86: Update Intel Atom processor family optimization 

Enable Intel Silvermont optimization for Intel Goldmont Plus.  Detect more
Intel Airmont processors.  Optimize Intel Tremont like Intel Silvermont
with rep string instructions.
This commit is contained in:
H.J. Lu 2020-05-21 13:36:54 -07:00
parent 03acbc1f71
commit 76d5b2f002
1 changed files with 19 additions and 1 deletions
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20
sysdeps/x86/cpu-features.c
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@ -347,18 +347,23 @@ init_cpu_features (struct cpu_features *cpu_features)
case 0x57:
/* Knights Landing. Enable Silvermont optimizations. */
case 0x7a:
/* Unaligned load versions are faster than SSSE3
on Goldmont Plus. */
case 0x5c:
case 0x5f:
/* Unaligned load versions are faster than SSSE3
on Goldmont. */
case 0x4c:
case 0x5a:
case 0x75:
/* Airmont is a die shrink of Silvermont. */
case 0x37:
case 0x4a:
case 0x4d:
case 0x5a:
case 0x5d:
/* Unaligned load versions are faster than SSSE3
on Silvermont. */
@ -369,6 +374,19 @@ init_cpu_features (struct cpu_features *cpu_features)
| bit_arch_Slow_SSE4_2);
break;
case 0x86:
case 0x96:
case 0x9c:
/* Enable rep string instructions, unaligned load, unaligned
copy, pminub and avoid SSE 4.2 on Tremont. */
cpu_features->feature[index_arch_Fast_Rep_String]
|= (bit_arch_Fast_Rep_String
| bit_arch_Fast_Unaligned_Load
| bit_arch_Fast_Unaligned_Copy
| bit_arch_Prefer_PMINUB_for_stringop
| bit_arch_Slow_SSE4_2);
break;
default:
/* Unknown family 0x06 processors. Assuming this is one
of Core i3/i5/i7 processors if AVX is available. */