[PATCH 7/9] rs6000: Rework vector integer comparison in rs6000_emit_vector_compare - p3

[Kewen Lin via Gcc-patches]

The current handlings in rs6000_emit_vector_compare is a bit
complicated to me, especially after we emit vector float
comparison insn with the given code directly.  So it's better
to refactor the handlings of vector integer comparison here.

This is part 3, it's to refactor the handlings on NE.
This patch doesn't introduce any functionality change.

gcc/ChangeLog:

        * config/rs6000/rs6000.cc (rs6000_emit_vector_compare): Refactor the
        handlings for operator NE.
---
 gcc/config/rs6000/rs6000.cc | 30 ++++++++++--------------------
 1 file changed, 10 insertions(+), 20 deletions(-)

diff --git a/gcc/config/rs6000/rs6000.cc b/gcc/config/rs6000/rs6000.cc
index c1aebbb5c03..b4ca7b3d1b1 100644
--- a/gcc/config/rs6000/rs6000.cc
+++ b/gcc/config/rs6000/rs6000.cc
@@ -15681,29 +15681,19 @@ rs6000_emit_vector_compare (enum rtx_code rcode,
       emit_insn (gen_rtx_SET (mask, gen_rtx_fmt_ee (code, dmode, op0, op1)));
       return mask;
     }
+  else if (rcode == NE)
+    {
+      /* ne(a,b) = ~eq(a,b)  */
+      mask = gen_reg_rtx (dmode);
+      emit_insn (gen_rtx_SET (mask, gen_rtx_fmt_ee (EQ, dmode, op0, op1)));
+      enum insn_code nor_code = optab_handler (one_cmpl_optab, dmode);
+      gcc_assert (nor_code != CODE_FOR_nothing);
+      emit_insn (GEN_FCN (nor_code) (mask, mask));
+      return mask;
+    }
 
   switch (rcode)
     {
-    case NE:
-      /* Invert condition and try again.
-        e.g., A != B becomes ~(A==B).  */
-      {
-       enum insn_code nor_code;
-       rtx mask2;
-
-       nor_code = optab_handler (one_cmpl_optab, dmode);
-       if (nor_code == CODE_FOR_nothing)
-         return NULL_RTX;
-
-       mask2 = rs6000_emit_vector_compare (EQ, op0, op1, dmode);
-       if (!mask2)
-         return NULL_RTX;
-
-       mask = gen_reg_rtx (dmode);
-       emit_insn (GEN_FCN (nor_code) (mask, mask2));
-       return mask;
-      }
-      break;
     case GE:
     case GEU:
     case LE:
-- 
2.27.0