diff options
| author | echristo <echristo@138bc75d-0d04-0410-961f-82ee72b054a4> | 2003-05-16 02:05:29 +0000 |
|---|---|---|
| committer | echristo <echristo@138bc75d-0d04-0410-961f-82ee72b054a4> | 2003-05-16 02:05:29 +0000 |
| commit | 195a9d8ba1e3817695824aa0fecc712f2acaf243 (patch) | |
| tree | 8f84bf067654a45ff68079db3e6fec811a68f301 /gcc/combine.c | |
| parent | 8741fd12518fae0eb0eaa8e6e6e29e988e023335 (diff) | |
| download | gcc-195a9d8ba1e3817695824aa0fecc712f2acaf243.tar.gz | |
2003-05-15 Eric Christopher <echristo@redhat.com>
* combine.c (expand_compound_operation): Make sure
that zero_extend operation is profitable.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@66853 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/combine.c')
| -rw-r--r-- | gcc/combine.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/gcc/combine.c b/gcc/combine.c index bff8b08f5bf..79f0226e8cd 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -5802,7 +5802,15 @@ expand_compound_operation (x) == 0))) { rtx temp = gen_rtx_ZERO_EXTEND (GET_MODE (x), XEXP (x, 0)); - return expand_compound_operation (temp); + rtx temp2 = expand_compound_operation (temp); + + /* Make sure this is a profitable operation. */ + if (rtx_cost (x, SET) > rtx_cost (temp2, SET)) + return temp2; + else if (rtx_cost (x, SET) > rtx_cost (temp, SET)) + return temp; + else + return x; } /* We can optimize some special cases of ZERO_EXTEND. */ |