It turns out most of the thumb2 instructions are not allowed to touch SP. The semanti...

[oota-llvm.git] / lib / Target / ARM / README-Thumb2.txt

diff --git a/lib/Target/ARM/README-Thumb2.txt b/lib/Target/ARM/README-Thumb2.txt
index 651d39311e0ba4838372e102024955566e67925c..48b5278122816dd31571a414cad60590dc648baf 100644 (file)
--- a/lib/Target/ARM/README-Thumb2.txt
+++ b/lib/Target/ARM/README-Thumb2.txt
@@ -1,3 +1,7 @@
 //===---------------------------------------------------------------------===//
 // Random ideas for the ARM backend (Thumb2 specific).
 //===---------------------------------------------------------------------===//
+
+We should be using ADD / SUB rd, sp, rm <shift> instructions.
+
+copyRegToReg should use tMOVgpr2gpr instead of t2MOVr?