[gcc(refs/users/omachota/heads/rtl-ssa-dce)] rtl-ssa-dce: fix offset_bitmap size

[Ondrej Machota via Gcc-cvs]

https://gcc.gnu.org/g:240fe8013efed4b33ba62582fdf9ae531bcd27a0

commit 240fe8013efed4b33ba62582fdf9ae531bcd27a0
Author: Ondřej Machota <ondrejmach...@gmail.com>
Date:   Tue Apr 22 12:20:36 2025 +0200

    rtl-ssa-dce: fix offset_bitmap size

Diff:
---
 gcc/dce.cc | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/gcc/dce.cc b/gcc/dce.cc
index 0a210b008e41..c83324d3aa15 100644
--- a/gcc/dce.cc
+++ b/gcc/dce.cc
@@ -1327,8 +1327,9 @@ struct offset_bitmap {
   public:
     offset_bitmap(size_t size, int offset) : m_offset{offset},
       m_bitmap{sbitmap_alloc(size)} {}
+
     offset_bitmap(int min_index, int max_index) : 
-      offset_bitmap(size_t(max_index - min_index), min_index) {}
+      offset_bitmap(size_t(max_index - min_index + 1), -min_index) {}
 
     void clear_bit(int index) {
       bitmap_clear_bit(m_bitmap, index + m_offset);
@@ -1731,7 +1732,7 @@ is_rtx_insn_prelive(rtx_insn *insn) {
 
   rtx body = PATTERN(insn);
   switch (GET_CODE(body)) {
-    // Clobbers are handled inside is_prelive
+    // Clobbers are handled inside is_prelive - what about parallel?
     // case CLOBBER: // gcc/gcc/testsuite/gcc.c-torture/compile/20000605-1.c
     case USE:
     case VAR_LOCATION:
@@ -1973,6 +1974,19 @@ propagate_dead_phis(std::unordered_set<insn_info *> 
&marked, std::unordered_set<
   return depends_on_dead_phi;
 }
 
+static void
+rtl_ssa_dce_debuggize(insn_info *insn) {
+  if (insn->is_phi()) {
+    return;
+  }
+
+  if (insn->is_debug_insn()) {
+    // we need to fix dependencies of this instruction because they might have
+    // changed
+    return;
+  }
+}
+
 static void
 test(insn_info *insn) {
   rtx_insn *rtl = insn->rtl();