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| author | Nick Clifton <nickc@redhat.com> | 2011-09-09 10:58:10 +0000 |
|---|---|---|
| committer | Nick Clifton <nickc@gcc.gnu.org> | 2011-09-09 10:58:10 +0000 |
| commit | cf13d9cf5071386d37ea4d5687d05b83fc9cc2b7 (patch) | |
| tree | 01ec91080790c328816a05eb3314af2abbf542b6 | |
| parent | 64d9cb054e8153852901aee359b62bca5e4c2a67 (diff) | |
| download | gcc-cf13d9cf5071386d37ea4d5687d05b83fc9cc2b7.zip gcc-cf13d9cf5071386d37ea4d5687d05b83fc9cc2b7.tar.gz gcc-cf13d9cf5071386d37ea4d5687d05b83fc9cc2b7.tar.bz2 | |
mn10300.c (mn10300_split_and_operand_count): Return a positive value to indicate that the bits at the bottom of the register...
* config/mn10300/mn10300.c (mn10300_split_and_operand_count):
Return a positive value to indicate that the bits at the
bottom of the register should be cleared.
From-SVN: r178724
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/config/mn10300/mn10300.c | 19 |
2 files changed, 24 insertions, 1 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index aadfd7d..4ede8ce 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,9 @@ +2011-09-09 Nick Clifton <nickc@redhat.com> + + * config/mn10300/mn10300.c (mn10300_split_and_operand_count): + Return a positive value to indicate that the bits at the + bottom of the register should be cleared. + 2011-09-09 Richard Guenther <rguenther@suse.de> * tree-ssa-operands.c (swap_tree_operands): Always adjust diff --git a/gcc/config/mn10300/mn10300.c b/gcc/config/mn10300/mn10300.c index 2cd178a..b5f3933 100644 --- a/gcc/config/mn10300/mn10300.c +++ b/gcc/config/mn10300/mn10300.c @@ -2878,6 +2878,23 @@ mn10300_match_ccmode (rtx insn, enum machine_mode cc_mode) return true; } +/* This function is used to help split: + + (set (reg) (and (reg) (int))) + + into: + + (set (reg) (shift (reg) (int)) + (set (reg) (shift (reg) (int)) + + where the shitfs will be shorter than the "and" insn. + + It returns the number of bits that should be shifted. A positive + values means that the low bits are to be cleared (and hence the + shifts should be right followed by left) whereas a negative value + means that the high bits are to be cleared (left followed by right). + Zero is returned when it would not be economical to split the AND. */ + int mn10300_split_and_operand_count (rtx op) { @@ -2894,7 +2911,7 @@ mn10300_split_and_operand_count (rtx op) would be replacing 1 6-byte insn with 2 3-byte insns. */ if (count > (optimize_insn_for_speed_p () ? 2 : 4)) return 0; - return -count; + return count; } else { |