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math/big: temporarily disable buggy shlVU assembly for arm64

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This addresses the failures we have seen in #31084. The correct
fix is to find the actual bug in the assembly code.

Updates #31084.

Change-Id: I437780c53d0c4423d742e2e3b650b899ce845372
Reviewed-on: https://go-review.googlesource.com/c/go/+/169721
Run-TryBot: Robert Griesemer <gri@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Robert Griesemer 2019-03-27 15:50:36 -07:00
parent 591193b01f
commit 4dce6dbb1e
1 changed files with 4 additions and 0 deletions
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4
src/math/big/arith_arm64.s
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@ -197,6 +197,10 @@ len0:
// func shlVU(z, x []Word, s uint) (c Word)
TEXT ·shlVU(SB),NOSPLIT,$0
// Disable assembly for now - it is subtly incorrect.
// See #31084 for a test that fails using this code.
B ·shlVU_g(SB)
MOVD z+0(FP), R0
MOVD z_len+8(FP), R1
MOVD x+24(FP), R2