The cost of lo_sum rtx for addi.d instruction my be a very big number if
computed by common function. It may cause some symbols saving to stack and
loading from stack if there no enough registers during loop optimization.
gcc/ChangeLog:
* config/loongarch/loongarch.cc (loongarch_rtx_costs): Add lo_sum cost.
---
gcc/config/loongarch/loongarch.cc | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/gcc/config/loongarch/loongarch.cc
b/gcc/config/loongarch/loongarch.cc
index 845fad5a8e8..0e57f09379c 100644
--- a/gcc/config/loongarch/loongarch.cc
+++ b/gcc/config/loongarch/loongarch.cc
@@ -3648,6 +3648,10 @@ loongarch_rtx_costs (rtx x, machine_mode mode, int
outer_code,
*total = COSTS_N_INSNS (4);
return false;
+ case LO_SUM:
+ *total = set_src_cost (XEXP (x, 0), mode, speed);
+ return true;
+
case LT:
case LTU:
case LE:
--
2.36.0
