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Re-apply this patch:

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2002-05-16  Dale Johannesen  <dalej@apple.com>
	  * combine.c (cant_combine_insn_p):  Reenable combinations
	  involving hard regs unless CLASS_LIKELY_SPILLED_P.

From-SVN: r65689
This commit is contained in:
J"orn Rennecke 2003-04-16 17:41:10 +00:00 committed by Joern Rennecke
parent c328adfa0e
commit 7f0ea82ec0
2 changed files with 16 additions and 6 deletions
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8
gcc/ChangeLog
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@ -1,3 +1,11 @@
2003-04-16 J"orn Rennecke <joern.rennecke@superh.com>
Re-apply this patch:
2002-05-16 Dale Johannesen <dalej@apple.com>
* combine.c (cant_combine_insn_p): Reenable combinations
involving hard regs unless CLASS_LIKELY_SPILLED_P.
2003-04-16 John David Anglin <dave.anglin@nrc-cnrc.gc.ca>
PR/10271

14
gcc/combine.c
View File

@ -1435,10 +1435,10 @@ cant_combine_insn_p (insn)
if (! INSN_P (insn))
return 1;
/* Never combine loads and stores involving hard regs. The register
allocator can usually handle such reg-reg moves by tying. If we allow
the combiner to make substitutions of hard regs, we risk aborting in
reload on machines that have SMALL_REGISTER_CLASSES.
/* Never combine loads and stores involving hard regs that are likely
to be spilled. The register allocator can usually handle such
reg-reg moves by tying. If we allow the combiner to make
substitutions of likely-spilled regs, we may abort in reload.
As an exception, we allow combinations involving fixed regs; these are
not available to the register allocator so there's no risk involved. */
@ -1453,9 +1453,11 @@ cant_combine_insn_p (insn)
dest = SUBREG_REG (dest);
if (REG_P (src) && REG_P (dest)
&& ((REGNO (src) < FIRST_PSEUDO_REGISTER
&& ! fixed_regs[REGNO (src)])
&& ! fixed_regs[REGNO (src)]
&& CLASS_LIKELY_SPILLED_P (REGNO_REG_CLASS (REGNO (src))))
|| (REGNO (dest) < FIRST_PSEUDO_REGISTER
&& ! fixed_regs[REGNO (dest)])))
&& ! fixed_regs[REGNO (dest)]
&& CLASS_LIKELY_SPILLED_P (REGNO_REG_CLASS (REGNO (dest))))))
return 1;
return 0;