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.
OK for master?
--
H.J.
From 6fbdc43bfc32ed6c88891f84bd367696cca1e247 Mon Sep 17 00:00:00 2001
From: "H.J. Lu" <hjl.to...@gmail.com>
Date: Mon, 12 May 2025 10:02:24 +0800
Subject: [PATCH] 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>
---
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 13e6c2a8abd..cc8313bd292 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);
}
--
2.49.0
