[gcc r14-3977] LoongArch: Change the value of branch_cost from 2 to 6.

[gcc r14-3977] LoongArch: Change the value of branch_cost from 2 to 6.

[LuluCheng]

https://gcc.gnu.org/g:3acf7e9da39360dab6ebb9dfc92208e9dadd982a

commit r14-3977-g3acf7e9da39360dab6ebb9dfc92208e9dadd982a
Author: Lulu Cheng <chenglulu@loongson.cn>
Date:   Wed Sep 13 11:01:34 2023 +0800

    LoongArch: Change the value of branch_cost from 2 to 6.
    
    gcc/ChangeLog:
    
            * config/loongarch/loongarch-def.c: Modify the default value of
            branch_cost.
    
    gcc/testsuite/ChangeLog:
    
            * gcc.target/loongarch/cmov_ii.c: New test.

Diff:
---
 gcc/config/loongarch/loongarch-def.c         |  4 ++--
 gcc/testsuite/gcc.target/loongarch/cmov_ii.c | 15 +++++++++++++++
 2 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/gcc/config/loongarch/loongarch-def.c b/gcc/config/loongarch/loongarch-def.c
index e744ee01d6d..430ef8b2d95 100644
--- a/gcc/config/loongarch/loongarch-def.c
+++ b/gcc/config/loongarch/loongarch-def.c
@@ -85,7 +85,7 @@ loongarch_cpu_align[N_TUNE_TYPES] = {
     .int_mult_di	= COSTS_N_INSNS (1),	\
     .int_div_si		= COSTS_N_INSNS (4),	\
     .int_div_di		= COSTS_N_INSNS (6),	\
-    .branch_cost	= 2,			\
+    .branch_cost	= 6,			\
     .memory_latency	= 4
 
 /* The following properties cannot be looked up directly using "cpucfg".
@@ -118,7 +118,7 @@ loongarch_rtx_cost_optimize_size = {
     .int_mult_di      = 4,
     .int_div_si	      = 4,
     .int_div_di	      = 4,
-    .branch_cost      = 2,
+    .branch_cost      = 6,
     .memory_latency   = 4,
 };
 
diff --git a/gcc/testsuite/gcc.target/loongarch/cmov_ii.c b/gcc/testsuite/gcc.target/loongarch/cmov_ii.c
new file mode 100644
index 00000000000..21b468e8ae1
--- /dev/null
+++ b/gcc/testsuite/gcc.target/loongarch/cmov_ii.c
@@ -0,0 +1,15 @@
+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+/* { dg-final { scan-assembler "test:.*xor.*maskeqz.*masknez.*or.*" } } */
+
+extern void foo_ii (int *, int *, int *, int *);
+
+int
+test (void)
+{
+  int a, b;
+  int c, d, out;
+  foo_ii (&a, &b, &c, &d);
+  out = a == b ? c : d;
+  return out;
+}