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cmd/asm: fix ARM64 vector register arrangement encoding bug

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The current code assigns vector register arrangement a wrong value
when the arrangement specifier is S2, which causes the incorrect
assembly.

The patch fixes the issue and adds the test cases.

Fixes #24249

Change-Id: I9736df1279494003d0b178da1af9cee9cd85ce21
Reviewed-on: https://go-review.googlesource.com/98555
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
fanzha02 2018-03-05 07:48:28 +00:00 committed by Cherry Zhang
parent 140bfe9cfe
commit fdf5aaf555
2 changed files with 6 additions and 1 deletions
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2
src/cmd/asm/internal/arch/arm64.go
View File

@ -267,7 +267,7 @@ func ARM64RegisterArrangement(reg int16, name, arng string) (int64, error) {
curSize = 1
curQ = 1
case "S2":
curSize = 1
curSize = 2
curQ = 0
case "S4":
curSize = 2

5
src/cmd/asm/internal/asm/testdata/arm64.s vendored
View File

@ -135,6 +135,11 @@ TEXT foo(SB), DUPOK|NOSPLIT, $-8
VLD1.P 64(R1), [V5.B16, V6.B16, V7.B16, V8.B16] // 2520df4c
VST1.P [V4.S4, V5.S4], 32(R1) // 24a89f4c
VST1 [V0.S4, V1.S4], (R0) // 00a8004c
VLD1 (R30), [V15.S2, V16.S2] // cfab400c
VLD1.P 24(R30), [V3.S2,V4.S2,V5.S2] // c36bdf0c
VST1.P [V24.S2], 8(R2) // 58789f0c
VST1 [V29.S2, V30.S2], (R29) // bdab000c
VST1 [V14.H4, V15.H4, V16.H4], (R27) // 6e67000c
VMOVS V20, (R0) // 140000bd
VMOVS.P V20, 4(R0) // 144400bc
VMOVS.W V20, 4(R0) // 144c00bc