The following patch prevents mistaken ASHIFT exchange found by
Richard Sandiford and removes check early_clobber matching operand.
The patch was successfully bootstrap on x86-64.
Committed as rev. 192742.
2012-10-23 Vladimir Makarov <vmaka...@redhat.com>
* lra-constraints.c (extract_loc_address_regs): Don't swap ASHIFT
operands.
(process_alt_operands): Remove code for checking DEAD note for
early clobber.
Index: lra-constraints.c
===================================================================
--- lra-constraints.c (revision 192702)
+++ lra-constraints.c (working copy)
@@ -639,7 +639,7 @@ extract_loc_address_regs (bool top_p, en
rtx *arg0_loc = &XEXP (x, 0);
enum rtx_code code0 = GET_CODE (*arg0_loc);
- if (code0 == CONST_INT)
+ if (code0 == CONST_INT && code == MULT)
arg0_loc = &XEXP (x, 1);
extract_loc_address_regs (false, mode, as, arg0_loc, true,
outer_code, code, modify_p, ad);
@@ -1781,17 +1781,7 @@ process_alt_operands (int only_alternati
match_p = false;
if (operands_match_p (*curr_id->operand_loc[nop],
*curr_id->operand_loc[m], m_hregno))
- {
- /* We should reject matching of an early
- clobber operand if the matching operand is
- not dying in the insn. */
- if (! curr_static_id->operand[m].early_clobber
- || operand_reg[nop] == NULL_RTX
- || (find_regno_note (curr_insn, REG_DEAD,
- REGNO (operand_reg[nop]))
- != NULL_RTX))
- match_p = true;
- }
+ match_p = true;
if (match_p)
{
/* If we are matching a non-offsettable
