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[patch] Fix PR target/48496 #2


Hi,

this is the spurious error on asm statements of the form:

  error: 'asm' operand requires impossible reload

present for IA-64 on mainline and 4.7 branch.  As diagnosed by Ulrich, the code 
responsible for the error implicitly assumes that constraints accepting memory 
operands also accept pseudo-registers during reload.  That isn't true for the 
Q constraint of IA-64.

Rather than tweaking the constraint, the patch tweaks constrain_operands to 
make it accept pseudo-registers with equivalent memory locations during reload.

Tested on IA-64/Linux, OK for mainline and 4.7 branch?


2012-04-26  Eric Botcazou  <ebotcazou@adacore.com>

        PR target/48496
	* recog.c (constrain_operands): If extra constraints are present,
	accept pseudo-registers with equivalent memory locations during reload.
	

-- 
Eric Botcazou
Index: recog.c
===================================================================
--- recog.c	(revision 186718)
+++ recog.c	(working copy)
@@ -2673,6 +2673,16 @@ constrain_operands (int strict)
 			   /* Every address operand can be reloaded to fit.  */
 			   && strict < 0)
 		    win = 1;
+		  /* Cater to architectures like IA-64 that define extra memory
+		     constraints without using define_memory_constraint.  */
+		  else if (reload_in_progress
+			   && REG_P (op)
+			   && REGNO (op) >= FIRST_PSEUDO_REGISTER
+			   && reg_renumber[REGNO (op)] < 0
+			   && reg_equiv_mem (REGNO (op)) != 0
+			   && EXTRA_CONSTRAINT_STR
+			      (reg_equiv_mem (REGNO (op)), c, p))
+		    win = 1;
 #endif
 		  break;
 		}

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