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| author | Adam Nemet <anemet@caviumnetworks.com> | 2006-02-14 17:45:55 +0000 |
|---|---|---|
| committer | Adam Nemet <nemet@gcc.gnu.org> | 2006-02-14 17:45:55 +0000 |
| commit | de7f492b6140cbaed6a3ca5b7ad478df15d7df30 (patch) | |
| tree | 0f30a432f7d2bcab1915731bfcfe037cbff9249a /gcc | |
| parent | 1cf0118daf84744dfc457bdb30c0c3816ae07307 (diff) | |
| download | gcc-de7f492b6140cbaed6a3ca5b7ad478df15d7df30.zip gcc-de7f492b6140cbaed6a3ca5b7ad478df15d7df30.tar.gz gcc-de7f492b6140cbaed6a3ca5b7ad478df15d7df30.tar.bz2 | |
* simplify-rtx.c (simplify_subreg): Combine SUBREG and TRUNCATE.
From-SVN: r110990
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 4 | ||||
| -rw-r--r-- | gcc/simplify-rtx.c | 8 |
2 files changed, 12 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 935add3..17c8b5f 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,7 @@ +2006-02-14 Adam Nemet <anemet@caviumnetworks.com> + + * simplify-rtx.c (simplify_subreg): Combine SUBREG and TRUNCATE. + 2006-02-14 Rainer Orth <ro@TechFak.Uni-Bielefeld.DE> PR bootstrap/26053 diff --git a/gcc/simplify-rtx.c b/gcc/simplify-rtx.c index c949dea..6f4f09b 100644 --- a/gcc/simplify-rtx.c +++ b/gcc/simplify-rtx.c @@ -4426,6 +4426,14 @@ simplify_subreg (enum machine_mode outermode, rtx op, return NULL_RTX; } + /* Merge implicit and explicit truncations. */ + + if (GET_CODE (op) == TRUNCATE + && GET_MODE_SIZE (outermode) < GET_MODE_SIZE (innermode) + && subreg_lowpart_offset (outermode, innermode) == byte) + return simplify_gen_unary (TRUNCATE, outermode, XEXP (op, 0), + GET_MODE (XEXP (op, 0))); + /* SUBREG of a hard register => just change the register number and/or mode. If the hard register is not valid in that mode, suppress this simplification. If the hard register is the stack, |