mirror/gcc
2
0
Fork 0
mirror of git://gcc.gnu.org/git/gcc.git synced 2024-12-30 07:34:39 +08:00
Code Issues Packages Projects Releases Wiki Activity

re PR rtl-optimization/8165 (builtin string functions SEGV on alpha-pc-linux-gnu at -O2)

Browse Source 
PR opt/8165
        * gcse.c (adjust_libcall_notes): Revert last change.
        * simplify-rtx.c (simplify_replace_rtx): Handle LO_SUM.

From-SVN: r58130
This commit is contained in:
Richard Henderson 2002-10-14 11:16:07 -07:00 committed by Richard Henderson
parent 3eb429b2ce
commit f4e3e61878
3 changed files with 25 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
gcc/ChangeLog
View File

@ -1,3 +1,9 @@
2002-10-14 Richard Henderson <rth@redhat.com>
PR opt/8165
* gcse.c (adjust_libcall_notes): Revert last change.
* simplify-rtx.c (simplify_replace_rtx): Handle LO_SUM.
2002-10-14 Andrew Haley <aph@redhat.com>
* tree-inline.c (remap_block): All local class initialization

14
gcc/gcse.c
View File

@ -4330,23 +4330,17 @@ do_local_cprop (x, insn, alter_jumps, libcall_sp)
/* LIBCALL_SP is a zero-terminated array of insns at the end of a libcall;
their REG_EQUAL notes need updating to reflect that OLDREG has been
replaced with NEWVAL in INSN. Also update the REG_EQUAL notes in INSN.
Return true if all substitutions could be made. */
replaced with NEWVAL in INSN. Return true if all substitutions could
be made. */
static bool
adjust_libcall_notes (oldreg, newval, insn, libcall_sp)
rtx oldreg, newval, insn, *libcall_sp;
{
rtx end, note;
note = find_reg_equal_equiv_note (insn);
if (note)
XEXP (note, 0) = replace_rtx (XEXP (note, 0), oldreg, newval);
rtx end;
while ((end = *libcall_sp++))
{
note = find_reg_equal_equiv_note (end);
rtx note = find_reg_equal_equiv_note (end);
if (! note)
continue;

17
gcc/simplify-rtx.c
View File

@ -343,9 +343,22 @@ simplify_replace_rtx (x, old, new)
return replace_equiv_address_nv (x,
simplify_replace_rtx (XEXP (x, 0),
old, new));
else if (code == LO_SUM)
{
rtx op0 = simplify_replace_rtx (XEXP (x, 0), old, new);
rtx op1 = simplify_replace_rtx (XEXP (x, 1), old, new);
if (REG_P (x) && REG_P (old) && REGNO (x) == REGNO (old))
return new;
/* (lo_sum (high x) x) -> x */
if (GET_CODE (op0) == HIGH && rtx_equal_p (XEXP (op0, 0), op1))
return op1;
return gen_rtx_LO_SUM (mode, op0, op1);
}
else if (code == REG)
{
if (REG_P (old) && REGNO (x) == REGNO (old))
return new;
}
return x;