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runtime: VZEROUPPER at the end of FilterNilAVX512

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VZEROUPPER at the end of FilterNilAVX512 as we're leaving AVX
context. Also explicitly zero Z15, as the high bits are not
guaranteed zero as of CL 728240.

Change-Id: I000a199206d0b8fd4905c8a699e934551bbd3c60
Reviewed-on: https://go-review.googlesource.com/c/go/+/728740
Reviewed-by: Michael Knyszek <mknyszek@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
This commit is contained in:
Cherry Mui 2025-12-09 11:48:41 -05:00
parent 36bca3166e
commit 0d71bd57c9
1 changed files with 2 additions and 0 deletions
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src/internal/runtime/gc/scan/filter_amd64.s
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@ -16,6 +16,7 @@ TEXT ·FilterNilAVX512(SB), NOSPLIT, $0-20
SUBL R10, R12 // R12 = n - scanned
CMPL R12, $8 // Compare (n - scanned) with 8
JLT scalar_loop // If (n - scanned) < 8, jump to the scalar cleanup
VPXOR X15, X15, X15 // Zero the high bits of Z15
vector_loop:
LEAQ (R8)(R10*8), R13 // R13 = buf[scanned:] address
@ -61,4 +62,5 @@ scalar_increment_i:
end:
MOVL R11, ret+16(FP)
VZEROUPPER
RET