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math: 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: Ic3ffeb9e63238ef41406d97cdc42502145ddb454
Reviewed-on: https://go-review.googlesource.com/c/go/+/230319
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 Bao 2020-04-27 12:02:52 -07:00 committed by Michael Munday
parent a637ee1970
commit d2f5e4e38c
2 changed files with 4 additions and 27 deletions
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8
src/math/arith_s390x.go
View File

@ -4,6 +4,8 @@
package math
import "internal/cpu"
func log10TrampolineSetup(x float64) float64
func log10Asm(x float64) float64
@ -70,8 +72,6 @@ func expm1Asm(x float64) float64
func powTrampolineSetup(x, y float64) float64
func powAsm(x, y float64) float64
// hasVectorFacility reports whether the machine has the z/Architecture
// hasVX reports whether the machine has the z/Architecture
// vector facility installed and enabled.
func hasVectorFacility() bool
var hasVX = hasVectorFacility()
var hasVX = cpu.S390X.HasVX

23
src/math/stubs_s390x.s
View File

@ -28,29 +28,6 @@ TEXT ·Mod(SB), NOSPLIT, $0
TEXT ·Remainder(SB), NOSPLIT, $0
BR ·remainder(SB)
// if go assembly use vector instruction
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 ·Log10(SB), NOSPLIT, $0
MOVD ·log10vectorfacility+0x00(SB), R1
BR (R1)