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salsa20/salsa: hide SP alignment from spadj

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The spadj computation in the assembler can't handle SP alignment code
and will just get confused by how it's currently written. Do the
alignment in a scratch register to hide it from the assembler.

Change-Id: I8857f428d96717db29e3a56050f2381bd86807c6
Reviewed-on: https://go-review.googlesource.com/31586
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Adam Langley <agl@golang.org>
This commit is contained in:
Austin Clements
2016-10-21 19:51:15 +00:00
parent e67f5eca87
commit a0819bbd36
1 changed files with 4 additions and 4 deletions
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salsa20/salsa/salsa2020_amd64.s
+4 -4
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@@ -16,10 +16,10 @@ TEXT ·salsa2020XORKeyStream(SB),0,$512-40
MOVQ key+32(FP),R8 MOVQ key+32(FP),R8
MOVQ SP,R11 MOVQ SP,R11
MOVQ $31,R9 MOVQ SP,R9
NOTQ R9 ADDQ $31, R9
ANDQ R9,SP ANDQ $~31, R9
ADDQ $32,SP MOVQ R9, SP
MOVQ R11,352(SP) MOVQ R11,352(SP)
MOVQ R12,360(SP) MOVQ R12,360(SP)