https://sourceware.org/bugzilla/show_bug.cgi?id=20614
Bug ID: 20614
Summary: gas missing full operand support for vpbroadcastb and
vpbroadcastw instructions
Product: binutils
Version: unspecified
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: gas
Assignee: unassigned at sourceware dot org
Reporter: geir at cray dot com
Target Milestone: ---
This does not assemble with the latest gas from git/master (commit d2dfe70):
.text
.globl main
.p2align 6, 0x90
.type main,@function
main:
vpbroadcastb %al, %ymm0
vpbroadcastw %ax, %ymm1
vpbroadcastb %eax, %ymm2
vpbroadcastw %eax, %ymm3
retq
The first two vpbroadcast instructions fail with "invalid operand" while the
second two get through.
I checked the opcodes table in the latest master binutils and it only supports
GR32 and GR64 source registers for these instructions. I see nothing in the
Intel documentation that restricts these instructions to only take 32- and
64-bit GPRs. As far as I can tell encodings for 8- and 16-bit GPR sizes are
legal.
It's certainly possible I missed some subtlety and if so it would be helpful to
have a better understanding of why these operand sizes aren't supported.
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