[PATCH] mips: add MSA vec_cmp and vec_cmpu expand pattern [PR101132]

[Xi Ruoyao via Gcc-patches]

Middle-end started to emit vec_cmp and vec_cmpu since GCC 11, causing
ICE on MIPS with MSA enabled.  Add the pattern to prevent it.

Bootstrapped and regression tested on mips64el-linux-gnu.
Ok for trunk?

gcc/

        * config/mips/mips-protos.h (mips_expand_vec_cmp_expr): Declare.
        * config/mips/mips.c (mips_expand_vec_cmp_expr): New function.
        * config/mips/mips-msa.md (vec_cmp<MSA:mode><mode_i>): New
          expander.
          (vec_cmpu<IMSA:mode><mode_i>): New expander.
---
 gcc/config/mips/mips-msa.md   | 22 ++++++++++++++++++++++
 gcc/config/mips/mips-protos.h |  1 +
 gcc/config/mips/mips.c        | 11 +++++++++++
 3 files changed, 34 insertions(+)

diff --git a/gcc/config/mips/mips-msa.md b/gcc/config/mips/mips-msa.md
index 3ecf2bde19f..3a67f25be56 100644
--- a/gcc/config/mips/mips-msa.md
+++ b/gcc/config/mips/mips-msa.md
@@ -435,6 +435,28 @@
   DONE;
 })
 
+(define_expand "vec_cmp<MSA:mode><mode_i>"
+  [(match_operand:<VIMODE> 0 "register_operand")
+   (match_operator 1 ""
+     [(match_operand:MSA 2 "register_operand")
+      (match_operand:MSA 3 "register_operand")])]
+  "ISA_HAS_MSA"
+{
+  mips_expand_vec_cmp_expr (operands);
+  DONE;
+})
+
+(define_expand "vec_cmpu<IMSA:mode><mode_i>"
+  [(match_operand:<VIMODE> 0 "register_operand")
+   (match_operator 1 ""
+     [(match_operand:IMSA 2 "register_operand")
+      (match_operand:IMSA 3 "register_operand")])]
+  "ISA_HAS_MSA"
+{
+  mips_expand_vec_cmp_expr (operands);
+  DONE;
+})
+
 (define_insn "msa_insert_<msafmt_f>"
   [(set (match_operand:MSA 0 "register_operand" "=f,f")
        (vec_merge:MSA
diff --git a/gcc/config/mips/mips-protos.h b/gcc/config/mips/mips-protos.h
index 2cf4ed50292..a685f7f7dd5 100644
--- a/gcc/config/mips/mips-protos.h
+++ b/gcc/config/mips/mips-protos.h
@@ -385,6 +385,7 @@ extern mulsidi3_gen_fn mips_mulsidi3_gen_fn (enum rtx_code);
 
 extern void mips_register_frame_header_opt (void);
 extern void mips_expand_vec_cond_expr (machine_mode, machine_mode, rtx *);
+extern void mips_expand_vec_cmp_expr (rtx *);
 
 /* Routines implemented in mips-d.c  */
 extern void mips_d_target_versions (void);
diff --git a/gcc/config/mips/mips.c b/gcc/config/mips/mips.c
index 00a8eef96aa..8f043399a8e 100644
--- a/gcc/config/mips/mips.c
+++ b/gcc/config/mips/mips.c
@@ -22321,6 +22321,17 @@ mips_expand_msa_cmp (rtx dest, enum rtx_code cond, rtx 
op0, rtx op1)
     }
 }
 
+void
+mips_expand_vec_cmp_expr (rtx *operands)
+{
+  rtx cond = operands[1];
+  rtx op0 = operands[2];
+  rtx op1 = operands[3];
+  rtx res = operands[0];
+
+  mips_expand_msa_cmp (res, GET_CODE (cond), op0, op1);
+}
+
 /* Expand VEC_COND_EXPR, where:
    MODE is mode of the result
    VIMODE equivalent integer mode
-- 
2.32.0