[PATCH] RISC-V: Generate helpers for cbranch4

[Christoph Muellner <cmuellner@gcc.gnu.org>]

On RISC-V we are facing the fact, that our conditional branches
require Pmode conditions. Currently, we generate them explicitly
with a check for Pmode and then calling the proper generator
(i.e. gen_cbranchdi4 on RV64 and gen_cbranchsi4 on RV32).
Let's simplify this code by generating the INSN helpers
and use gen_cbranch4 (Pmode).

    gcc/
        PR 100266
        * config/rsicv/riscv.c (riscv_block_move_loop): Simplify.
        * config/rsicv/riscv.md (cbranch<mode>4): Generate helpers.
---
 gcc/config/riscv/riscv.c  |  5 +----
 gcc/config/riscv/riscv.md | 12 ++++--------
 2 files changed, 5 insertions(+), 12 deletions(-)

diff --git a/gcc/config/riscv/riscv.c b/gcc/config/riscv/riscv.c
index e1064e374eb0..27665e5b58f9 100644
--- a/gcc/config/riscv/riscv.c
+++ b/gcc/config/riscv/riscv.c
@@ -3258,10 +3258,7 @@ riscv_block_move_loop (rtx dest, rtx src, unsigned HOST_WIDE_INT length,
 
   /* Emit the loop condition.  */
   test = gen_rtx_NE (VOIDmode, src_reg, final_src);
-  if (Pmode == DImode)
-    emit_jump_insn (gen_cbranchdi4 (test, src_reg, final_src, label));
-  else
-    emit_jump_insn (gen_cbranchsi4 (test, src_reg, final_src, label));
+  emit_jump_insn (gen_cbranch4 (Pmode, test, src_reg, final_src, label));
 
   /* Mop up any left-over bytes.  */
   if (leftover)
diff --git a/gcc/config/riscv/riscv.md b/gcc/config/riscv/riscv.md
index 0e35960fefaa..f88877fd5966 100644
--- a/gcc/config/riscv/riscv.md
+++ b/gcc/config/riscv/riscv.md
@@ -2153,7 +2153,7 @@
 		      (label_ref (match_operand 1))
 		      (pc)))])
 
-(define_expand "cbranch<mode>4"
+(define_expand "@cbranch<mode>4"
   [(set (pc)
 	(if_then_else (match_operator 0 "comparison_operator"
 		      [(match_operand:BR 1 "register_operand")
@@ -2167,7 +2167,7 @@
   DONE;
 })
 
-(define_expand "cbranch<mode>4"
+(define_expand "@cbranch<mode>4"
   [(set (pc)
 	(if_then_else (match_operator 0 "fp_branch_comparison"
 		       [(match_operand:ANYF 1 "register_operand")
@@ -2829,12 +2829,8 @@
 					        operands[0],
 					        operands[1]));
 
-  if (mode == DImode)
-    emit_jump_insn (gen_cbranchdi4 (gen_rtx_EQ (VOIDmode, result, const0_rtx),
-				    result, const0_rtx, operands[2]));
-  else
-    emit_jump_insn (gen_cbranchsi4 (gen_rtx_EQ (VOIDmode, result, const0_rtx),
-				    result, const0_rtx, operands[2]));
+  rtx cond = gen_rtx_EQ (VOIDmode, result, const0_rtx);
+  emit_jump_insn (gen_cbranch4 (mode, cond, result, const0_rtx, operands[2]));
 
   DONE;
 })
-- 
2.31.1