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[lra] a tiny patch to improve pseudos splitting
- From: Vladimir Makarov <vmakarov at redhat dot com>
- To: GCC Patches <gcc-patches at gcc dot gnu dot org>
- Date: Fri, 18 May 2012 15:13:06 -0400
- Subject: [lra] a tiny patch to improve pseudos splitting
The following patch improves pseudos splitting.
The patch was successfully bootstrapped on x86/x86-64.
Committed as rev. 187656.
2012-05-18 Vladimir Makarov <vmakarov@redhat.com>
* lra-constraints.c (need_for_split_p): Split only when there
are at
least 3 potential reloads instead of 2.
Index: lra-constraints.c
===================================================================
--- lra-constraints.c (revision 187637)
+++ lra-constraints.c (working copy)
@@ -3894,7 +3894,7 @@ need_for_split_p (HARD_REG_SET potential
{
gcc_assert (reg_renumber[regno] >= 0);
return ((TEST_HARD_REG_BIT (potential_reload_hard_regs, reg_renumber[regno])
- && usage_insns[regno].reloads_num + 1 < reloads_num)
+ && usage_insns[regno].reloads_num + 2 < reloads_num)
|| need_for_call_save_p (regno));
}