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 <ebotca...@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;
}
