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reload.c (combine_reloads): Don't combine an output reload if there are other reloads around for part of... 

* reload.c (combine_reloads): Don't combine an output reload if there
	are other reloads around for part of the output.

From-SVN: r46734
This commit is contained in:
Richard Kenner 2001-11-03 15:56:17 +00:00 committed by Richard Kenner
parent 1285011e67
commit 6b3736a12b
2 changed files with 21 additions and 0 deletions
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11
gcc/ChangeLog
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@ -1,5 +1,16 @@
Sat Nov 3 10:37:56 2001 Richard Kenner <kenner@vlsi1.ultra.nyu.edu>
* reload.c (combine_reloads): Don't combine an output reload if there
are other reloads around for part of the output.
* emit-rtl.c (set_mem_attributes): Set RTX_UNCHANGINGP_P if T is a
constant expression.
(set_mem_decl): New function.
* expr.h (set_mem_decl): New declaration.
* final.c (get_decl_from_op): Don't use ORIGINAL_REGNO if not pseudo.
(output_asm_operand_names): Add tab.
* reload1.c (alter_reg): Set decl of MEM from REG_DECL.
* builtins.c (get_memory_rtx): Properly set MEM alias set and
attributes.

10
gcc/reload.c
View File

@ -1641,6 +1641,16 @@ combine_reloads ()
if (earlyclobber_operand_p (rld[output_reload].out))
return;
/* If there is a reload for part of the address of this operand, we would
need to chnage it to RELOAD_FOR_OTHER_ADDRESS. But that would extend
its life to the point where doing this combine would not lower the
number of spill registers needed. */
for (i = 0; i < n_reloads; i++)
if ((rld[i].when_needed == RELOAD_FOR_OUTPUT_ADDRESS
|| rld[i].when_needed == RELOAD_FOR_OUTADDR_ADDRESS)
&& rld[i].opnum == rld[output_reload].opnum)
return;
/* Check each input reload; can we combine it? */
for (i = 0; i < n_reloads; i++)