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Jan Hubicka <hubicka@freesoft.cz>

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Jan Hubicka <hubicka@freesoft.cz>
        * i386.c (agi_dependent): Handle push operation more correctly.

From-SVN: r26412
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Jan Hubicka 1999-04-13 16:50:49 +02:00 committed by Richard Henderson
parent 6e383e6196
commit b985a30f32
2 changed files with 27 additions and 3 deletions
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4
gcc/ChangeLog
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@ -1,3 +1,7 @@
Tue Apr 13 14:49:13 1999 Jan Hubicka <hubicka@freesoft.cz>
* i386.c (agi_dependent): Handle push operation more correctly.
Tue Apr 13 14:45:17 1999 Jan Hubicka <hubicka@freesoft.cz>
* i386.md (anddi3): Add % constraint.

26
gcc/config/i386/i386.c
View File

@ -5037,16 +5037,36 @@ int
agi_dependent (insn, dep_insn)
rtx insn, dep_insn;
{
int push = 0, push_dep = 0;
if (GET_CODE (dep_insn) == INSN
&& GET_CODE (PATTERN (dep_insn)) == SET
&& GET_CODE (SET_DEST (PATTERN (dep_insn))) == REG)
return reg_mentioned_in_mem (SET_DEST (PATTERN (dep_insn)), insn);
&& GET_CODE (SET_DEST (PATTERN (dep_insn))) == REG
&& reg_mentioned_in_mem (SET_DEST (PATTERN (dep_insn)), insn))
return 1;
if (GET_CODE (insn) == INSN && GET_CODE (PATTERN (insn)) == SET
&& GET_CODE (SET_DEST (PATTERN (insn))) == MEM
&& push_operand (SET_DEST (PATTERN (insn)),
GET_MODE (SET_DEST (PATTERN (insn)))))
push = 1;
if (GET_CODE (dep_insn) == INSN && GET_CODE (PATTERN (dep_insn)) == SET
&& GET_CODE (SET_DEST (PATTERN (dep_insn))) == MEM
&& push_operand (SET_DEST (PATTERN (dep_insn)),
GET_MODE (SET_DEST (PATTERN (dep_insn)))))
return reg_mentioned_in_mem (stack_pointer_rtx, insn);
push_dep = 1;
/* CPUs contain special hardware to allow two pushes. */
if (push && push_dep)
return 0;
/* Push operation implicitly change stack pointer causing AGI stalls. */
if (push_dep && reg_mentioned_in_mem (stack_pointer_rtx, insn))
return 1;
/* Push also implicitly read stack pointer. */
if (push && modified_in_p (stack_pointer_rtx, dep_insn))
return 1;
return 0;
}