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(fixup_var_refs_insn): Delete CLOBBER of VAR.

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(fixup_var_refs_insn): Delete CLOBBER of VAR.  If VAR is being
assigned into by a libcall sequence, remove the libcall notes.

From-SVN: r6632
This commit is contained in:
Richard Kenner 1994-02-26 16:12:46 -05:00
parent 9ff08f70f3
commit 63770d6ae3
1 changed files with 29 additions and 7 deletions
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36
gcc/function.c
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@ -1307,15 +1307,37 @@ fixup_var_refs_insns (var, promoted_mode, unsignedp, insn, toplevel)
rtx note;
if (GET_RTX_CLASS (GET_CODE (insn)) == 'i')
{
/* If this is a CLOBBER of VAR, delete it.
If it has a REG_LIBCALL note, delete the REG_LIBCALL
and REG_RETVAL notes too. */
if (GET_CODE (PATTERN (insn)) == CLOBBER
&& XEXP (PATTERN (insn), 0) == var)
{
if ((note = find_reg_note (insn, REG_LIBCALL, NULL_RTX)) != 0)
/* The REG_LIBCALL note will go away since we are going to
turn INSN into a NOTE, so just delete the
corresponding REG_RETVAL note. */
remove_note (XEXP (note, 0),
find_reg_note (XEXP (note, 0), REG_RETVAL,
NULL_RTX));
/* In unoptimized compilation, we shouldn't call delete_insn
except in jump.c doing warnings. */
PUT_CODE (insn, NOTE);
NOTE_LINE_NUMBER (insn) = NOTE_INSN_DELETED;
NOTE_SOURCE_FILE (insn) = 0;
}
/* The insn to load VAR from a home in the arglist
is now a no-op. When we see it, just delete it. */
if (toplevel
&& GET_CODE (PATTERN (insn)) == SET
&& SET_DEST (PATTERN (insn)) == var
/* If this represents the result of an insn group,
don't delete the insn. */
&& find_reg_note (insn, REG_RETVAL, NULL_RTX) == 0
&& rtx_equal_p (SET_SRC (PATTERN (insn)), var))
else if (toplevel
&& GET_CODE (PATTERN (insn)) == SET
&& SET_DEST (PATTERN (insn)) == var
/* If this represents the result of an insn group,
don't delete the insn. */
&& find_reg_note (insn, REG_RETVAL, NULL_RTX) == 0
&& rtx_equal_p (SET_SRC (PATTERN (insn)), var))
{
/* In unoptimized compilation, we shouldn't call delete_insn
except in jump.c doing warnings. */