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| author | Jim Wilson <wilson@cygnus.com> | 1999-03-08 17:50:37 +0000 |
|---|---|---|
| committer | Jim Wilson <wilson@gcc.gnu.org> | 1999-03-08 09:50:37 -0800 |
| commit | 49071ddced0d0e0e3425fa7dc054744ca1f3e491 (patch) | |
| tree | 1a1b10b8f474423521688b3622cb9fc89a44b410 /gcc/local-alloc.c | |
| parent | 66830675f2c2820222585b4a84b3f2ab7912dfbb (diff) | |
| download | gcc-49071ddced0d0e0e3425fa7dc054744ca1f3e491.tar.gz | |
Fix performance problem on SH with unnecessary move instructions.
* local-alloc.c (combine_regs): Don't combine if we have a hard reg
for which CLASS_LIKELY_SPILLED_P is true.
From-SVN: r25644
Diffstat (limited to 'gcc/local-alloc.c')
| -rw-r--r-- | gcc/local-alloc.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/gcc/local-alloc.c b/gcc/local-alloc.c index ea97f33f5b5..d3dde6b7555 100644 --- a/gcc/local-alloc.c +++ b/gcc/local-alloc.c @@ -1648,6 +1648,11 @@ combine_regs (usedreg, setreg, may_save_copy, insn_number, insn, already_dead) || ureg == sreg /* Don't try to connect two different hardware registers. */ || (ureg < FIRST_PSEUDO_REGISTER && sreg < FIRST_PSEUDO_REGISTER) + /* Don't use a hard reg that might be spilled. */ + || (ureg < FIRST_PSEUDO_REGISTER + && CLASS_LIKELY_SPILLED_P (REGNO_REG_CLASS (ureg))) + || (sreg < FIRST_PSEUDO_REGISTER + && CLASS_LIKELY_SPILLED_P (REGNO_REG_CLASS (sreg))) /* Don't connect two different machine modes if they have different implications as to which registers may be used. */ || !MODES_TIEABLE_P (GET_MODE (usedreg), GET_MODE (setreg))) |