RA sometimes will use lowest the cost of the mode with all different regclasses
w/o check if it's hard_regno_mode_ok.
It's impossible to put modes whose size > 8 into MASK_REGS, ajdust the cost to
avoid potential performance issue.
Bootstrapped and regtested on x86_64-pc-linux-gnu{-m32,}.
Ok for trunk?
gcc/ChangeLog:
* config/i386/i386.cc (inline_memory_move_cost): Return 100
for MASK_REGS when MODE_SIZE > 8.
---
gcc/config/i386/i386.cc | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/gcc/config/i386/i386.cc b/gcc/config/i386/i386.cc
index 2cc8e9548a9..2581b800a06 100644
--- a/gcc/config/i386/i386.cc
+++ b/gcc/config/i386/i386.cc
@@ -19847,9 +19847,12 @@ inline_memory_move_cost (machine_mode mode, enum
reg_class regclass, int in)
index = 1;
break;
/* DImode loads and stores assumed to cost the same as SImode. */
- default:
+ case 4:
+ case 8:
index = 2;
break;
+ default:
+ return 100;
}
if (in == 2)
--
2.39.1.388.g2fc9e9ca3c
