[PATCH,MIPS] Fix pr86067 ICE: scal-to-vec1.c:86:1: error: unrecognizable insn with -march=loongson3a

[Paul Hua]

Hi:

The gcc.c-torture/execute/scal-to-vec1.c  trigger a gcc ICE bug.

It's a mistake in define_expand vec_setv4hi in loongson.md file.

375 (define_expand "vec_setv4hi"
376   [(set (match_operand:V4HI 0 "register_operand" "=f")
377         (unspec:V4HI [(match_operand:V4HI 1 "register_operand" "f")
378                       (match_operand:HI 2 "register_operand" "f")
379                       (match_operand:SI 3 "const_0_to_3_operand" "")]
380                      UNSPEC_LOONGSON_PINSRH))]
381   "TARGET_HARD_FLOAT && TARGET_LOONGSON_VECTORS"
382 {
383   rtx ext = gen_reg_rtx (SImode);
384   emit_move_insn (ext, gen_lowpart (SImode, operands[1]));
385   operands[1] = ext;
386 })

The line 384 gen_lowpart the operands[1], should be gen_lowpart
operands[2], cause the operands[2] are HImode.


The attached patch fixed this bug.

Bootstrapped and reg-tested on mips64el-unknown-linux-gnu.
Ok for commit ?


-------------------------------
2018-03-24  Chenghua Xu <paul.hua...@gmail.com>

    PR c/target 86076
    * gcc/config/mips/loongson.md (vec_setv4hi): Gen_lowpart  for operands[2]
      instead of operands[1].

diff --git a/gcc/config/mips/loongson.md b/gcc/config/mips/loongson.md
index 38912ac..14794d3 100644
--- a/gcc/config/mips/loongson.md
+++ b/gcc/config/mips/loongson.md
@@ -381,8 +381,8 @@
   "TARGET_HARD_FLOAT && TARGET_LOONGSON_VECTORS"
 {
   rtx ext = gen_reg_rtx (SImode);
-  emit_move_insn (ext, gen_lowpart (SImode, operands[1]));
-  operands[1] = ext;
+  emit_move_insn (ext, gen_lowpart (SImode, operands[2]));
+  operands[2] = ext;
 })
 
 ;; Multiply and add packed integers.