[PATCH] LoongArch: Change the value of branch_cost from 2 to 6.

[PATCH] LoongArch: Change the value of branch_cost from 2 to 6.

[Lulu Cheng]

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.
---
 gcc/config/loongarch/loongarch-def.c         |  4 ++--
 gcc/testsuite/gcc.target/loongarch/cmov_ii.c | 16 ++++++++++++++++
 2 files changed, 18 insertions(+), 2 deletions(-)
 create mode 100644 gcc/testsuite/gcc.target/loongarch/cmov_ii.c

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..466a4c1c9af
--- /dev/null
+++ b/gcc/testsuite/gcc.target/loongarch/cmov_ii.c
@@ -0,0 +1,16 @@
+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+/* { dg-final { scan-assembler "main:.*xor.*masknez.*maskeqz.*or.*" } }
+ */
+void printf (char *, ...);
+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;
+  printf ("%d\n", out);
+}
-- 
2.31.1

Re: [pushed][PATCH] LoongArch: Change the value of branch_cost from 2 to 6.

[chenglulu]

Pushed to r14-3977.

在 2023/9/13 上午11:11, Lulu Cheng 写道:
> 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.
> ---
>   gcc/config/loongarch/loongarch-def.c         |  4 ++--
>   gcc/testsuite/gcc.target/loongarch/cmov_ii.c | 16 ++++++++++++++++
>   2 files changed, 18 insertions(+), 2 deletions(-)
>   create mode 100644 gcc/testsuite/gcc.target/loongarch/cmov_ii.c
>
> 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..466a4c1c9af
> --- /dev/null
> +++ b/gcc/testsuite/gcc.target/loongarch/cmov_ii.c
> @@ -0,0 +1,16 @@
> +/* { dg-do compile } */
> +/* { dg-options "-O2" } */
> +/* { dg-final { scan-assembler "main:.*xor.*masknez.*maskeqz.*or.*" } }
> + */
> +void printf (char *, ...);
> +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;
> +  printf ("%d\n", out);
> +}