[llvm-bugs] [Bug 34488] New: llvm-mc aarch64 doesn't accept "mov x6, v6.2d"
llvm-bugs at lists.llvm.org
Tue Sep 5 15:26:24 PDT 2017
Bug ID: 34488
Summary: llvm-mc aarch64 doesn't accept "mov x6, v6.2d"
Component: Backend: AArch64
Assignee: unassignedbugs at nondot.org
Reporter: roland at hack.frob.com
CC: llvm-bugs at lists.llvm.org, phosek at chromium.org
GAS accepts "mov x6, v6.2d" and treats it the same as "mov x6, v6.d".
Same for 8b, 16b, 2h, 4h, 8h, 2s, 4s, 1d.
The AAarch64 manual doesn't say this syntax is allowed, but it's an obvious
thing for people to do since "v6.2d" is a valid name for the whole register.
"Canonical" code such as Linaro's own cortex-strings uses "v6.2d" instead of
AFAICT gas actually just ignores the digits before the 'd' here entirely so
they can be anything, which doesn't seem real defensible.
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