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rs6000.h (PREFERRED_RELOAD_CLASS): If we have a choice, don't put integer values in FP regs.

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* config/rs6000/rs6000.h (PREFERRED_RELOAD_CLASS): If we have a
choice, don't put integer values in FP regs.

From-SVN: r35162
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Geoff Keating 2000-07-21 00:44:14 +00:00 • committed by Geoffrey Keating
parent 21f096b3a9
commit 1e66d55591
2 changed files with 23 additions and 4 deletions
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gcc/ChangeLog
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@ -1,3 +1,8 @@
2000-07-20 Geoff Keating <geoffk@cygnus.com>
* config/rs6000/rs6000.h (PREFERRED_RELOAD_CLASS): If we have a
choice, don't put integer values in FP regs.
Thu Jul 20 18:13:52 2000 Jeffrey A Law (law@cygnus.com)
* flow.c (verify_flow_info): Revamp code to verify that the

22
gcc/config/rs6000/rs6000.h
View file

@ -1105,12 +1105,26 @@ enum reg_class
in some cases it is preferable to use a more restrictive class.
On the RS/6000, we have to return NO_REGS when we want to reload a
floating-point CONST_DOUBLE to force it to be copied to memory. */
floating-point CONST_DOUBLE to force it to be copied to memory.
We also don't want to reload integer values into floating-point
registers if we can at all help it. In fact, this can
cause reload to abort, if it tries to generate a reload of CTR
into a FP register and discovers it doesn't have the memory location
required.
??? Would it be a good idea to have reload do the converse, that is
try to reload floating modes into FP registers if possible?
*/
#define PREFERRED_RELOAD_CLASS(X,CLASS) \
((GET_CODE (X) == CONST_DOUBLE \
&& GET_MODE_CLASS (GET_MODE (X)) == MODE_FLOAT) \
? NO_REGS : (CLASS))
(((GET_CODE (X) == CONST_DOUBLE \
&& GET_MODE_CLASS (GET_MODE (X)) == MODE_FLOAT) \
? NO_REGS \
: (GET_MODE_CLASS (GET_MODE (X)) == MODE_INT \
&& (CLASS) == NON_SPECIAL_REGS) \
? GENERAL_REGS \
: (CLASS)))
/* Return the register class of a scratch register needed to copy IN into
or out of a register in CLASS in MODE. If it can be done directly,