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* [gcc r14-3977] LoongArch: Change the value of branch_cost from 2 to 6.
@ 2023-09-14 7:02 LuluCheng
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From: LuluCheng @ 2023-09-14 7:02 UTC (permalink / raw)
To: gcc-cvs
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;
+}
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