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math/big: simplify hasVX checking on s390x

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Originally, we use an assembly function that returns a boolean result to
tell whether the machine has vector facility or not. It is now no longer
needed when we can directly use cpu.S390X.HasVX variable.

Change-Id: Ic1dae851982532bcfd9a9453416c112347f21d87
Reviewed-on: https://go-review.googlesource.com/c/go/+/230318
Reviewed-by: Michael Munday <mike.munday@ibm.com>
Run-TryBot: Michael Munday <mike.munday@ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Ruixin(Peter) Bao 2020-04-27 09:51:01 -04:00 committed by Michael Munday
parent d2f5e4e38c
commit a7e9e84716
2 changed files with 3 additions and 24 deletions
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5
src/math/big/arith_decl_s390x.go
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@ -6,12 +6,13 @@
package big
import "internal/cpu"
func addVV_check(z, x, y []Word) (c Word)
func addVV_vec(z, x, y []Word) (c Word)
func addVV_novec(z, x, y []Word) (c Word)
func subVV_check(z, x, y []Word) (c Word)
func subVV_vec(z, x, y []Word) (c Word)
func subVV_novec(z, x, y []Word) (c Word)
func hasVectorFacility() bool
var hasVX = hasVectorFacility()
var hasVX = cpu.S390X.HasVX

22
src/math/big/arith_s390x.s
View File

@ -9,28 +9,6 @@
// This file provides fast assembly versions for the elementary
// arithmetic operations on vectors implemented in arith.go.
TEXT ·hasVectorFacility(SB), NOSPLIT, $24-1
MOVD $x-24(SP), R1
XC $24, 0(R1), 0(R1) // clear the storage
MOVD $2, R0 // R0 is the number of double words stored -1
WORD $0xB2B01000 // STFLE 0(R1)
XOR R0, R0 // reset the value of R0
MOVBZ z-8(SP), R1
AND $0x40, R1
BEQ novector
vectorinstalled:
// check if the vector instruction has been enabled
VLEIB $0, $0xF, V16
VLGVB $0, V16, R1
CMPBNE R1, $0xF, novector
MOVB $1, ret+0(FP) // have vx
RET
novector:
MOVB $0, ret+0(FP) // no vx
RET
TEXT ·mulWW(SB), NOSPLIT, $0
MOVD x+0(FP), R3
MOVD y+8(FP), R4