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Fix performance problem on SH with unnecessary move instructions.

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* 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
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Jim Wilson 1999-03-08 17:50:37 +00:00 committed by Jim Wilson
parent 66830675f2
commit 49071ddced
2 changed files with 8 additions and 0 deletions
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gcc/ChangeLog
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@ -1,5 +1,8 @@
Mon Mar 8 16:04:44 1999 Jim Wilson <wilson@cygnus.com>
* local-alloc.c (combine_regs): Don't combine if we have a hard reg
for which CLASS_LIKELY_SPILLED_P is true.
* unroll.c (loop_iterations): Only call loop_find_equiv_value if we
have a REG or SUBREG.

5
gcc/local-alloc.c
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@ -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)))