[gcc(refs/vendors/riscv/heads/gcc-15-with-riscv-opts)] RISC-V: Add new option --param=gpr2vr-cost= for rvv insn

[Jeff Law]

https://gcc.gnu.org/g:78976e4a0a09964c7fc45471b1362248b9b642bd

commit 78976e4a0a09964c7fc45471b1362248b9b642bd
Author: Pan Li <pan2.li@intel.com>
Date:   Tue May 6 16:26:06 2025 +0800

    RISC-V: Add new option --param=gpr2vr-cost= for rvv insn
    
    During investigate the combine from vec_dup and vop.vv into
    vop.vx, we need to depend on the cost of the insn operate
    from the gpr to vr, for example, vadd.vx.  Thus, for better
    control and test, we introduce a new option, aka below:
    
    --param=gpr2vr-cost=<unsigned int>
    
    To specific the cost value of the insn that operate from
    the gpr to vr.
    
    gcc/ChangeLog:
    
            * config/riscv/riscv-opts.h (RVV_GR2VR_COST_UNPROVIDED): Add
            new macro to indicate the param is not provided.
            * config/riscv/riscv.opt: Add new option --pararm=gpr2vr-cost.
    
    Signed-off-by: Pan Li <pan2.li@intel.com>
    (cherry picked from commit 17c1602d5e7b237357b94808399a68ab77d42640)

Diff:
---
 gcc/config/riscv/riscv-opts.h | 2 ++
 gcc/config/riscv/riscv.opt    | 4 ++++
 2 files changed, 6 insertions(+)

diff --git a/gcc/config/riscv/riscv-opts.h b/gcc/config/riscv/riscv-opts.h
index 26fe228e0f82..9766b89b2dff 100644
--- a/gcc/config/riscv/riscv-opts.h
+++ b/gcc/config/riscv/riscv-opts.h
@@ -162,4 +162,6 @@ enum riscv_tls_type {
 #define TARGET_VECTOR_AUTOVEC_SEGMENT					       \
   (TARGET_VECTOR && riscv_mautovec_segment)
 
+#define GPR2VR_COST_UNPROVIDED -1
+
 #endif /* ! GCC_RISCV_OPTS_H */
diff --git a/gcc/config/riscv/riscv.opt b/gcc/config/riscv/riscv.opt
index 7515c8ea13dd..710248099b3c 100644
--- a/gcc/config/riscv/riscv.opt
+++ b/gcc/config/riscv/riscv.opt
@@ -579,6 +579,10 @@ Inline strlen calls if possible.
 Target RejectNegative Joined UInteger Var(riscv_strcmp_inline_limit) Init(64)
 Max number of bytes to compare as part of inlined strcmp/strncmp routines (default: 64).
 
+-param=gpr2vr-cost=
+Target RejectNegative Joined UInteger Var(gpr2vr_cost) Init(GPR2VR_COST_UNPROVIDED)
+Set the cost value of the rvv instruction when operate from GPR to VR.
+
 Enum
 Name(rvv_max_lmul) Type(enum rvv_max_lmul_enum)
 The RVV possible LMUL (-mrvv-max-lmul=):