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| author | Georg-Johann Lay <avr@gjlay.de> | 2012-06-28 13:53:51 +0000 |
|---|---|---|
| committer | Georg-Johann Lay <gjl@gcc.gnu.org> | 2012-06-28 13:53:51 +0000 |
| commit | b04ffa565302de59ad22d8211925f78c52b042e5 (patch) | |
| tree | 25d4b89100af9db23b7feb3d67f9815625d19593 /gcc/config/avr/avr.c | |
| parent | bd8e704ff4bfb4594a4d9e1dd816cafa0e67f1d0 (diff) | |
| download | gcc-b04ffa565302de59ad22d8211925f78c52b042e5.zip gcc-b04ffa565302de59ad22d8211925f78c52b042e5.tar.gz gcc-b04ffa565302de59ad22d8211925f78c52b042e5.tar.bz2 | |
re PR other/53595 (Code size increase of +10% between two 4.7.1 snapshot)
PR 53595
* config/avr/avr.c (avr_hard_regno_call_part_clobbered): New.
* config/avr/avr-protos.h (avr_hard_regno_call_part_clobbered): New.
* config/avr/avr.h (HARD_REGNO_CALL_PART_CLOBBERED): Forward to
avr_hard_regno_call_part_clobbered.
From-SVN: r189049
Diffstat (limited to 'gcc/config/avr/avr.c')
| -rw-r--r-- | gcc/config/avr/avr.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/gcc/config/avr/avr.c b/gcc/config/avr/avr.c index 8199d2e..68048b6 100644 --- a/gcc/config/avr/avr.c +++ b/gcc/config/avr/avr.c @@ -8856,6 +8856,28 @@ avr_hard_regno_mode_ok (int regno, enum machine_mode mode) } +/* Implement `HARD_REGNO_CALL_PART_CLOBBERED'. */ + +int +avr_hard_regno_call_part_clobbered (unsigned regno, enum machine_mode mode) +{ + /* FIXME: This hook gets called with MODE:REGNO combinations that don't + represent valid hard registers like, e.g. HI:29. Returning TRUE + for such registers can lead to performance degradation as mentioned + in PR53595. Thus, report invalid hard registers as FALSE. */ + + if (!avr_hard_regno_mode_ok (regno, mode)) + return 0; + + /* Return true if any of the following boundaries is crossed: + 17/18, 27/28 and 29/30. */ + + return ((regno < 18 && regno + GET_MODE_SIZE (mode) > 18) + || (regno < REG_Y && regno + GET_MODE_SIZE (mode) > REG_Y) + || (regno < REG_Z && regno + GET_MODE_SIZE (mode) > REG_Z)); +} + + /* Implement `MODE_CODE_BASE_REG_CLASS'. */ enum reg_class |