llvm/subreg-on-physreg.mir at 0ee16969ab362f02f9de13e7a19ce86cf55335f1 - llvm - Gitea: Git with a cup of tea

RPCSX/llvm

mirror of https://github.com/RPCSX/llvm.git synced 2025-01-19 19:03:50 +00:00

Matthias Braun ad0f5f6b52 MIRParser: Use dot instead of colon to mark subregisters

Change the syntax to use `%0.sub8` to denote a subregister.

This seems like a more natural fit to denote subregisters; I also plan
to introduce a new ":classname" syntax in upcoming patches to denote the
register class of a vreg.

Note that this commit disallows plain identifiers to start with a '.'
character.  This shouldn't affect anything as external names/IR
references are all prefixed with '$'/'%', plain identifiers are only
used for instruction names, register mask names and subreg indexes.

Differential Revision: https://reviews.llvm.org/D22390

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@276815 91177308-0d34-0410-b5e6-96231b3b80d8

2016-07-26 21:49:34 +00:00

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 # RUN: not llc -march=x86-64 -run-pass none -o /dev/null %s 2>&1 | FileCheck %s
 # This test ensures that an error is reported for subreg index on a physreg.
 --- |
   define void @t() { ret void }
 ...
 ---
 name: t
 body: |
   bb.0:
     ; CHECK: [[@LINE+1]]:19: subregister index expects a virtual register
     %eax.sub_8bit = COPY %bl
 ...