[gcc r16-535] x86: Remove df_insn_rescan after emit_insn_*

[H.J. Lu via Gcc-cvs]

https://gcc.gnu.org/g:9506c28a557bcea34af13478f05d2d9fc3727072

commit r16-535-g9506c28a557bcea34af13478f05d2d9fc3727072
Author: H.J. Lu <hjl.to...@gmail.com>
Date:   Mon May 12 10:02:24 2025 +0800

    x86: Remove df_insn_rescan after emit_insn_*
    
    Since df_insn_rescan has been called by emit_insn_*, there is no need
    to call it after calling emit_insn_*.  Remove its unnecessary usages.
    
            PR target/120228
            * config/i386/i386-features.cc (ix86_place_single_vector_set):
            Remove df_insn_rescan after emit_insn_*.
            (remove_partial_avx_dependency): Likewise.
            (replace_vector_const): Likewise.
    
    Signed-off-by: H.J. Lu <hjl.to...@gmail.com>

Diff:
---
 gcc/config/i386/i386-features.cc | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/gcc/config/i386/i386-features.cc b/gcc/config/i386/i386-features.cc
index 13e6c2a8abd1..cc8313bd292f 100644
--- a/gcc/config/i386/i386-features.cc
+++ b/gcc/config/i386/i386-features.cc
@@ -3095,13 +3095,10 @@ ix86_place_single_vector_set (rtx dest, rtx src, bitmap 
bbs)
       insn = NEXT_INSN (insn);
     }
 
-  rtx_insn *set_insn;
   if (insn == BB_HEAD (bb))
-    set_insn = emit_insn_before (set, insn);
+    emit_insn_before (set, insn);
   else
-    set_insn = emit_insn_after (set,
-                               insn ? PREV_INSN (insn) : BB_END (bb));
-  df_insn_rescan (set_insn);
+    emit_insn_after (set, insn ? PREV_INSN (insn) : BB_END (bb));
 }
 
 /* At entry of the nearest common dominator for basic blocks with
@@ -3225,7 +3222,6 @@ remove_partial_avx_dependency (void)
          /* Generate an XMM vector SET.  */
          set = gen_rtx_SET (vec, src);
          set_insn = emit_insn_before (set, insn);
-         df_insn_rescan (set_insn);
 
          if (cfun->can_throw_non_call_exceptions)
            {
@@ -3396,8 +3392,7 @@ replace_vector_const (machine_mode vector_mode, rtx 
vector_const,
                  vreg = gen_reg_rtx (vmode);
                  rtx vsubreg = gen_rtx_SUBREG (vmode, vector_const, 0);
                  rtx pat = gen_rtx_SET (vreg, vsubreg);
-                 rtx_insn *vinsn = emit_insn_before (pat, insn);
-                 df_insn_rescan (vinsn);
+                 emit_insn_before (pat, insn);
                }
              replace = gen_rtx_SUBREG (mode, vreg, 0);
            }