(Resending, the original attempt wrapped unexpectedly.)
This applies Richard Sandiford's patch for Linaro GCC as an alternative
to disabling the Linaro-specific extension elimination optimization
altogether.
Original patch: https://bugs.launchpad.net/gcc-linaro/+bug/728315
Signed-off-by: Mark Mentovai <m...@moxienet.com>
---
Index: toolchain/gcc/patches/linaro/860-fix_extension_elimination.patch
===================================================================
--- toolchain/gcc/patches/linaro/860-fix_extension_elimination.patch
(revision 0)
+++ toolchain/gcc/patches/linaro/860-fix_extension_elimination.patch
(revision 0)
@@ -0,0 +1,18 @@
+https://bugs.launchpad.net/gcc-linaro/+bug/728315
+https://lists.openwrt.org/pipermail/openwrt-devel/2011-March/009847.html
+
+--- a/gcc/ee.c
++++ b/gcc/ee.c
+@@ -209,7 +209,11 @@
+
+ *regno = REGNO (reg);
+
+- if (paradoxical_subreg_p (use))
++ /* Non-paradoxical SUBREGs of promoted vars guarantee that the
++ upper (elided) bits of the inner register have a particular value.
++ For our purposes, such SUBREGs act as a full reference to the
++ inner register. */
++ if (paradoxical_subreg_p (use) || SUBREG_PROMOTED_VAR_P (use))
+ *size = GET_MODE_BITSIZE (GET_MODE (reg));
+ else
+ *size = subreg_lsb (use) + GET_MODE_BITSIZE (GET_MODE (use));
Index: toolchain/gcc/patches/linaro/860-disable_extension_elimination.patch
===================================================================
---
toolchain/gcc/patches/linaro/860-disable_extension_elimination.patch
(revision 25854)
+++
toolchain/gcc/patches/linaro/860-disable_extension_elimination.patch
(working copy)
@@ -1,11 +0,0 @@
---- a/gcc/opts.c
-+++ b/gcc/opts.c
-@@ -906,7 +906,7 @@ decode_options (unsigned int argc, const
- flag_tree_if_to_switch_conversion = opt2;
- flag_ipa_cp = opt2;
- flag_ipa_sra = opt2;
-- flag_ee = opt2;
-+ flag_ee = 0;
-
- /* Track fields in field-sensitive alias analysis. */
- set_param_value ("max-fields-for-field-sensitive",
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