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cmd/asm: VFMA and VFMS incorrectly encoded on s390x #17444

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mundaym opened this issue Oct 14, 2016 · 1 comment
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cmd/asm: VFMA and VFMS incorrectly encoded on s390x #17444

mundaym opened this issue Oct 14, 2016 · 1 comment
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FrozenDueToAge NeedsFix The path to resolution is known, but the work has not been done.
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Go1.8

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@mundaym
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mundaym commented Oct 14, 2016

What version of Go are you using (go version)?

go version devel +d13fa4d Fri Oct 14 03:58:15 2016 +0000 linux/s390x

What did you do?

Assembled the following instructions and disassembled using objdump -d:

VFMADB  V16, V8, V9, V10
WFMADB  V17, V18, V19, V20
VFMSDB  V2, V25, V24, V31
WFMSDB  V31, V2, V3, V4

(These are extended mnemonics for VFMA and VFMS.)

What did you expect to see?

e7 a0 83 00 94 8f       vfmadb  %v10,%v16,%v8,%v9
e7 41 23 08 3f 8f       wfmadb  %v20,%v17,%v18,%v19
e7 f2 93 00 8b 8e       vfmsdb  %v31,%v2,%v25,%v24
e7 4f 23 08 34 8e       wfmsdb  %v4,%v31,%v2,%v3

What did you see instead?

e7 a0 80 03 94 8f       vfma    %v10,%v16,%v8,%v9,3,0
e7 41 28 03 3f 8f       vfma    %v20,%v17,%v18,%v19,3,8
e7 f2 90 03 8b 8e       vfms    %v31,%v2,%v25,%v24,3,0
e7 4f 28 03 34 8e       vfms    %v4,%v31,%v2,%v3,3,8

Will send a CL shortly. Thanks to Kang QI Zhang for finding this.
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CL https://golang.org/cl/31130 mentions this issue.

@quentinmit quentinmit added the NeedsFix The path to resolution is known, but the work has not been done. label Oct 17, 2016
@quentinmit quentinmit added this to the Go1.8 milestone Oct 17, 2016
@golang golang locked and limited conversation to collaborators Oct 21, 2017
@rsc rsc unassigned mundaym Jun 23, 2022
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FrozenDueToAge NeedsFix The path to resolution is known, but the work has not been done.
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