From b6264decdbec4940f66a8850450ab1c31f058b4c Mon Sep 17 00:00:00 2001 From: Evan Cheng Date: Fri, 10 Jul 2009 02:10:17 +0000 Subject: [PATCH] More info about Thumb1 predication support. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75220 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Target/ARM/README-Thumb.txt | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/lib/Target/ARM/README-Thumb.txt b/lib/Target/ARM/README-Thumb.txt index 3b27ed3889a..eed3c54372a 100644 --- a/lib/Target/ARM/README-Thumb.txt +++ b/lib/Target/ARM/README-Thumb.txt @@ -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.