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| author | law <law@138bc75d-0d04-0410-961f-82ee72b054a4> | 1998-10-10 16:03:44 +0000 |
|---|---|---|
| committer | law <law@138bc75d-0d04-0410-961f-82ee72b054a4> | 1998-10-10 16:03:44 +0000 |
| commit | 5d92a54845c0cd1ca923744a5334b7459520f4ec (patch) | |
| tree | a0186dcc34dc8e70af183411fc3bdd7a33f9780b | |
| parent | 28bae3bfae2510c9f355d12bb59538b811582ee7 (diff) | |
| download | gcc-5d92a54845c0cd1ca923744a5334b7459520f4ec.tar.gz | |
* regmove.c (optimize_reg_copy_3): Honor TRULY_NOOP_TRUNCATION.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@22977 138bc75d-0d04-0410-961f-82ee72b054a4
| -rw-r--r-- | gcc/ChangeLog | 4 | ||||
| -rw-r--r-- | gcc/regmove.c | 8 |
2 files changed, 12 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 45908ac8642..a60d9eed2c7 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,7 @@ +Sat Oct 10 17:01:42 1998 Jeffrey A Law (law@cygnus.com) + + * regmove.c (optimize_reg_copy_3): Honor TRULY_NOOP_TRUNCATION. + Fri Oct 9 22:08:05 1998 Kaveh R. Ghazi <ghazi@caip.rutgers.edu> * fp-bit.c (SFtype): Don't implicitly use int in declaration. diff --git a/gcc/regmove.c b/gcc/regmove.c index 41235f13704..35ddf12d6f3 100644 --- a/gcc/regmove.c +++ b/gcc/regmove.c @@ -552,6 +552,14 @@ optimize_reg_copy_3 (insn, dest, src) || GET_CODE (SET_SRC (set)) != MEM || SET_DEST (set) != src_reg) return; + + /* Do not use a SUBREG to truncate from one mode to another if truncation + is not a nop. */ + if (GET_MODE_BITSIZE (GET_MODE (src_reg)) <= GET_MODE_BITSIZE (GET_MODE (src)) + && !TRULY_NOOP_TRUNCATION (GET_MODE_BITSIZE (GET_MODE (src)), + GET_MODE_BITSIZE (GET_MODE (src_reg)))) + return; + old_mode = GET_MODE (src_reg); PUT_MODE (src_reg, GET_MODE (src)); XEXP (src, 0) = SET_SRC (set); |