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More info about Thumb1 predication support.

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llvm-svn: 75220
This commit is contained in:
Evan Cheng 2009-07-10 02:10:17 +00:00
parent 74f5327e53
commit 6e276f4376
1 changed files with 2 additions and 1 deletions
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3
lib/Target/ARM/README-Thumb.txt
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@ -236,4 +236,5 @@ to avoid extra work when we convert Thumb2 instructions to Thumb1 instructions.
//===---------------------------------------------------------------------===//
We need to make (some of the) Thumb1 instructions predicable. That will allow
shrinking of predicated Thumb2 instructions.
shrinking of predicated Thumb2 instructions. To allow this, we need to be able
to toggle the 's' bit since they do not set CPSR when they are inside IT blocks.