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runtime: check GOAMD64 v4 compatibility on Darwin

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Darwin requires a different approach to check AVX512 support.

Update #45453

Change-Id: Ia3dfecc04b47aab16f472000e92e46d4fc6d596d
Reviewed-on: https://go-review.googlesource.com/c/go/+/365395
Reviewed-by: Keith Randall <khr@golang.org>
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Trust: Heschi Kreinick <heschi@google.com>
This commit is contained in:
vpachkov 2021-11-19 14:38:23 +03:00 committed by Keith Randall
parent a41763539c
commit 6a40bdcbaf
1 changed files with 24 additions and 1 deletions
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25
src/runtime/asm_amd64.s
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@ -136,9 +136,20 @@ GLOBL bad_cpu_msg<>(SB), RODATA, $84
#define NEED_EXT_FEATURES_CX V4_EXT_FEATURES_CX
#define NEED_EXT_FEATURES_BX V4_EXT_FEATURES_BX
// Downgrading v4 OS checks on Darwin for now, see CL 285572.
// Darwin requires a different approach to check AVX512 support, see CL 285572.
#ifdef GOOS_darwin
#define NEED_OS_SUPPORT_AX V3_OS_SUPPORT_AX
// These values are from:
// https://github.com/apple/darwin-xnu/blob/xnu-4570.1.46/osfmk/i386/cpu_capabilities.h
#define commpage64_base_address 0x00007fffffe00000
#define commpage64_cpu_capabilities64 (commpage64_base_address+0x010)
#define commpage64_version (commpage64_base_address+0x01E)
#define hasAVX512F 0x0000004000000000
#define hasAVX512CD 0x0000008000000000
#define hasAVX512DQ 0x0000010000000000
#define hasAVX512BW 0x0000020000000000
#define hasAVX512VL 0x0000100000000000
#define NEED_DARWIN_SUPPORT (hasAVX512F | hasAVX512DQ | hasAVX512CD | hasAVX512BW | hasAVX512VL)
#else
#define NEED_OS_SUPPORT_AX V4_OS_SUPPORT_AX
#endif
@ -311,6 +322,18 @@ ok:
JNE bad_cpu
#endif
#ifdef NEED_DARWIN_SUPPORT
MOVQ $commpage64_version, BX
CMPW (BX), $13 // cpu_capabilities64 undefined in versions < 13
JL bad_cpu
MOVQ $commpage64_cpu_capabilities64, BX
MOVQ (BX), BX
MOVQ $NEED_DARWIN_SUPPORT, CX
ANDQ CX, BX
CMPQ BX, CX
JNE bad_cpu
#endif
CALL runtime·check(SB)
MOVL 24(SP), AX // copy argc