add a note about the red zone

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22518 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/PowerPC/README.txt b/lib/Target/PowerPC/README.txt
index 386d21f3f96653bf5dfca9fda4479e2ac978a7d1..b1d3028572bfda7789197636acb455f03db1d68f 100644 (file)
--- a/lib/Target/PowerPC/README.txt
+++ b/lib/Target/PowerPC/README.txt
@@ -3,10 +3,12 @@ TODO:
 * implement do-loop -> bdnz transform
 * implement powerpc-64 for darwin
 * use stfiwx in float->int
+* take advantage of the darwin red zone in PPC32RegisterInfo.cpp
 * be able to combine sequences like the following into 2 instructions:
        lis r2, ha16(l2__ZTV4Cell)
        la r2, lo16(l2__ZTV4Cell)(r2)
        addi r2, r2, 8
+
 * should hint to the branch select pass that it doesn't need to print the
   second unconditional branch, so we don't end up with things like:
        b .LBBl42__2E_expand_function_8_674     ; loopentry.24