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| author | Jan Hubicka <hubicka@freesoft.cz> | 1999-04-13 16:50:49 +0200 |
|---|---|---|
| committer | Richard Henderson <rth@gcc.gnu.org> | 1999-04-13 07:50:49 -0700 |
| commit | b985a30f322f6e5d744e1b70a6d83e238543d652 (patch) | |
| tree | 9185c012683c2a7aaef1b88d8a4d2514dbe3e4a0 /gcc/config | |
| parent | 6e383e61963c7291c615632fd14b78a503ebb55d (diff) | |
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Jan Hubicka <hubicka@freesoft.cz>
Jan Hubicka <hubicka@freesoft.cz>
* i386.c (agi_dependent): Handle push operation more correctly.
From-SVN: r26412
Diffstat (limited to 'gcc/config')
| -rw-r--r-- | gcc/config/i386/i386.c | 26 |
1 files changed, 23 insertions, 3 deletions
diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c index ab54235..e6f807b 100644 --- a/gcc/config/i386/i386.c +++ b/gcc/config/i386/i386.c @@ -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; } |