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Fix to reload bug
- To: gcc-patches at gcc dot gnu dot org
- Subject: Fix to reload bug
- From: kenner at vlsi1 dot ultra dot nyu dot edu (Richard Kenner)
- Date: Sat, 3 Nov 01 11:04:32 EST
This bug caused Ada to not bootstrap on Sparc. Tested to make sure it fixed
that problem there and then on alphaev56-dec-osf4.0c.
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.
*** reload.c 2001/10/30 12:41:44 1.169
--- reload.c 2001/11/03 15:17:50
*************** combine_reloads ()
*** 1642,1645 ****
--- 1642,1655 ----
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? */