[PATCH] Fix invalid RTL sharing caused by STV changes

[Richard Biener]

I am testing the following and will commit it as obvious.

Richard.

2019-08-21  Richard Biener  <rguent...@suse.de>

        PR target/91498
        * config/i386/i386-features.c
        (general_scalar_chain::make_vector_copies): Copy stack temporary
        rtx when using it multiple times.
        (general_scalar_chain::convert_reg): Likewise.

Index: gcc/config/i386/i386-features.c
===================================================================
--- gcc/config/i386/i386-features.c     (revision 274764)
+++ gcc/config/i386/i386-features.c     (working copy)
@@ -706,7 +706,7 @@ general_scalar_chain::make_vector_copies
                                gen_rtx_SUBREG (SImode, reg, 4));
              }
            else
-             emit_move_insn (tmp, reg);
+             emit_move_insn (copy_rtx (tmp), reg);
            emit_insn (gen_rtx_SET (gen_rtx_SUBREG (vmode, vreg, 0),
                                    gen_gpr_to_xmm_move_src (vmode, tmp)));
          }
@@ -810,7 +810,7 @@ general_scalar_chain::convert_reg (unsig
                                  adjust_address (tmp, SImode, 4));
                }
              else
-               emit_move_insn (scopy, tmp);
+               emit_move_insn (scopy, copy_rtx (tmp));
            }
          else if (!TARGET_64BIT && smode == DImode)
            {