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authorRong Xu <xur@google.com>2014-07-21 16:47:22 -0700
committerRong Xu <xur@google.com>2014-07-29 15:31:03 -0700
commit38a8aecfb882072900434499696b5c32a2274515 (patch)
tree2aac97f0ae24b03cd98c1a06e989c031c173f889 /gcc-4.9/gcc/lra-eliminations.c
parentc231900e5dcc14d8296bd9f62b45997a49d4d5e7 (diff)
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[4.9] Switch gcc-4.9 to use google/gcc-4_9 branch.
This source drop uses svn version r212828 of google/gcc-4.9 branch. We also cherry-picked r213062, r213063 and r213064 to fix windows build issues. All gcc-4.9 patches before July 3rd are ported to google/gcc-4.9. The following prior commits has not been merged to google branch yet. (They are included in this commit). e7af147f979e657fe2df00808e5b4319b0e088c6, baf87df3cb2683649ba7e9872362a7e721117c23, and c231900e5dcc14d8296bd9f62b45997a49d4d5e7. Change-Id: I4bea3ea470387ff751c2be4cb0d4a12059b9299b
Diffstat (limited to 'gcc-4.9/gcc/lra-eliminations.c')
-rw-r--r--gcc-4.9/gcc/lra-eliminations.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/gcc-4.9/gcc/lra-eliminations.c b/gcc-4.9/gcc/lra-eliminations.c
index abdf69733..278782035 100644
--- a/gcc-4.9/gcc/lra-eliminations.c
+++ b/gcc-4.9/gcc/lra-eliminations.c
@@ -565,6 +565,16 @@ lra_eliminate_regs_1 (rtx insn, rtx x, enum machine_mode mem_mode,
alter_subreg (&x, false);
return x;
}
+ else if (! subst_p)
+ {
+ /* LRA can transform subregs itself. So don't call
+ simplify_gen_subreg until LRA transformations are
+ finished. Function simplify_gen_subreg can do
+ non-trivial transformations (like truncation) which
+ might make LRA work to fail. */
+ SUBREG_REG (x) = new_rtx;
+ return x;
+ }
else
return simplify_gen_subreg (GET_MODE (x), new_rtx,
GET_MODE (new_rtx), SUBREG_BYTE (x));