LoongArch: Add rtx_cost support for ORDERED comparison.

In commit 16-8400-g48c2ea1750efe4, VCOND_MASK is inverted
(if that would be an improvement).  However, since the LoongArch
backend does not define the rtx_cost for the ORDERED RTX, the
calculated cost for UNORDERED becomes greater than that of ORDERED.
This triggers an inversion from UNORDERED to ORDERED, leading to
test failures in lasx-vcond-2.c and lsx-vcond-2.c.

Since the assembly sequences generated for ORDERED and UNORDERED
are identical on LoongArch, I have set the rtx_cost for ORDERED
to match that of UNORDERED.  This ensures consistent cost
evaluation and allows the related test cases to pass.

gcc/ChangeLog:

	* config/loongarch/loongarch.cc (loongarch_rtx_costs): Add
	RTX cost handling for the ORDERED RTX code.

diff --git a/gcc/config/loongarch/loongarch.cc b/gcc/config/loongarch/loongarch.cc
index 4a0a9bafa8138b4751269ea1ffeb0e723e7aa2df..1ecf356ac6cb7d34ff1fc1811f7f74b3bf0aaa69 100644 (file)
--- a/gcc/config/loongarch/loongarch.cc
+++ b/gcc/config/loongarch/loongarch.cc
@@ -4280,6 +4280,7 @@ loongarch_rtx_costs (rtx x, machine_mode mode, int outer_code,
     case EQ:
     case NE:
     case UNORDERED:
+    case ORDERED:
     case LTGT:
     case UNGE:
     case UNGT: