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| author | Andreas Krebbel <krebbel1@de.ibm.com> | 2008-01-24 18:06:20 +0000 |
|---|---|---|
| committer | Andreas Krebbel <krebbel@gcc.gnu.org> | 2008-01-24 18:06:20 +0000 |
| commit | 5f1b2ee68fd6f165fe469c6ce55016fd8033fdcc (patch) | |
| tree | c3c0fd281734f5db6e80b3263359fc56176d434f | |
| parent | 986d97ed88e7abef3addb0d867dc20378f5dd290 (diff) | |
| download | gcc-5f1b2ee68fd6f165fe469c6ce55016fd8033fdcc.zip gcc-5f1b2ee68fd6f165fe469c6ce55016fd8033fdcc.tar.gz gcc-5f1b2ee68fd6f165fe469c6ce55016fd8033fdcc.tar.bz2 | |
s390.h (MOVE_RATIO): Define new target macro.
2008-01-24 Andreas Krebbel <krebbel1@de.ibm.com>
* config/s390/s390.h (MOVE_RATIO): Define new target macro.
From-SVN: r131799
| -rw-r--r-- | gcc/ChangeLog | 4 | ||||
| -rw-r--r-- | gcc/config/s390/s390.h | 10 |
2 files changed, 14 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index d4d310c..4047d86 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,7 @@ +2008-01-24 Andreas Krebbel <krebbel1@de.ibm.com> + + * config/s390/s390.h (MOVE_RATIO): Define new target macro. + 2008-01-24 Richard Sandiford <rsandifo@nildram.co.uk> PR tree-optimization/34472 diff --git a/gcc/config/s390/s390.h b/gcc/config/s390/s390.h index 3ce8498..a19cdd4 100644 --- a/gcc/config/s390/s390.h +++ b/gcc/config/s390/s390.h @@ -815,6 +815,16 @@ extern struct rtx_def *s390_compare_op0, *s390_compare_op1, *s390_compare_emitte /* Don't perform CSE on function addresses. */ #define NO_FUNCTION_CSE +/* This value is used in tree-sra to decide whether it might benefical + to split a struct move into several word-size moves. For S/390 + only small values make sense here since struct moves are relatively + cheap thanks to mvc so the small default value choosen for archs + with memmove patterns should be ok. But this value is multiplied + in tree-sra with UNITS_PER_WORD to make a decision so we adjust it + here to compensate for that factor since mvc costs exactly the same + on 31 and 64 bit. */ +#define MOVE_RATIO (TARGET_64BIT? 2 : 4) + /* Sections. */ |