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(fixup_var_refs_insns): If SMALL_REGISTER_CLASSES...

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(fixup_var_refs_insns): If SMALL_REGISTER_CLASSES, ensure we don't put
any insns between the setting of the function return register and it's use.

From-SVN: r3660
This commit is contained in:
Richard Kenner 1993-03-05 17:37:11 -05:00
parent c2ae03cb30
commit 02a10449e3
1 changed files with 42 additions and 3 deletions
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45
gcc/function.c
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@ -999,6 +999,8 @@ fixup_var_refs_insns (var, promoted_mode, unsignedp, insn, toplevel)
rtx insn;
int toplevel;
{
rtx call_dest = 0;
while (insn)
{
rtx next = NEXT_INSN (insn);
@ -1022,6 +1024,46 @@ fixup_var_refs_insns (var, promoted_mode, unsignedp, insn, toplevel)
}
else
{
struct fixup_replacement *replacements = 0;
rtx next_insn = NEXT_INSN (insn);
#ifdef SMALL_REGISTER_CLASSES
/* If the insn that copies the results of a CALL_INSN
into a pseudo now references VAR, we have to use an
intermediate pseudo since we want the life of the
return value register to be only a single insn.
If we don't use an intermediate pseudo, such things as
address computations to make the address of VAR valid
if it is not can be placed beween the CALL_INSN and INSN.
To make sure this doesn't happen, we record the destination
of the CALL_INSN and see if the next insn uses both that
and VAR. */
if (call_dest != 0 && GET_CODE (insn) == INSN
&& reg_mentioned_p (var, PATTERN (insn))
&& reg_mentioned_p (call_dest, PATTERN (insn)))
{
rtx temp = gen_reg_rtx (GET_MODE (call_dest));
emit_insn_before (gen_move_insn (temp, call_dest), insn);
PATTERN (insn) = replace_rtx (PATTERN (insn),
call_dest, temp);
}
if (GET_CODE (insn) == CALL_INSN
&& GET_CODE (PATTERN (insn)) == SET)
call_dest = SET_DEST (PATTERN (insn));
else if (GET_CODE (insn) == CALL_INSN
&& GET_CODE (PATTERN (insn)) == PARALLEL
&& GET_CODE (XVECEXP (PATTERN (insn), 0, 0)) == SET)
call_dest = SET_DEST (XVECEXP (PATTERN (insn), 0, 0));
else
call_dest = 0;
#endif
/* See if we have to do anything to INSN now that VAR is in
memory. If it needs to be loaded into a pseudo, use a single
pseudo for the entire insn in case there is a MATCH_DUP
@ -1033,9 +1075,6 @@ fixup_var_refs_insns (var, promoted_mode, unsignedp, insn, toplevel)
If it allocated a pseudo for any replacement, we copy into
it here. */
struct fixup_replacement *replacements = 0;
rtx next_insn = NEXT_INSN (insn);
fixup_var_refs_1 (var, promoted_mode, &PATTERN (insn), insn,
&replacements);