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rtl.h (set_noop_p): Declare.
* rtl.h (set_noop_p): Declare. * flow.c (set_noop_p): Move from here ... * rtlanal.c (set_noop_p): ... to here and enhance. * cse.c (delete_trivially_dead_insns): Use it. * gcse.c (hash_scan_set): Likewise. * jump.c (delete_noop_moves): Likewise. * recog.c (split_all_insns): Likewise. From-SVN: r41077
This commit is contained in:
John Wehle
John Wehle
parent
0c918ce59c
commit
7142e31845
@ -1,3 +1,13 @@
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Wed Apr 4 00:45:38 EDT 2001 John Wehle (john@feith.com)
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* rtl.h (set_noop_p): Declare.
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* flow.c (set_noop_p): Move from here ...
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* rtlanal.c (set_noop_p): ... to here and enhance.
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* cse.c (delete_trivially_dead_insns): Use it.
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* gcse.c (hash_scan_set): Likewise.
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* jump.c (delete_noop_moves): Likewise.
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* recog.c (split_all_insns): Likewise.
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2001-04-04 Alan Modra <alan@linuxcare.com.au>
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* dwarf2out.c (dwarf2out_frame_debug_expr): Support adjusting
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13
gcc/cse.c
13
gcc/cse.c
@ -7612,14 +7612,7 @@ delete_trivially_dead_insns (insns, nreg)
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live_insn = ! dead_libcall;
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else if (GET_CODE (PATTERN (insn)) == SET)
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{
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if ((GET_CODE (SET_DEST (PATTERN (insn))) == REG
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|| GET_CODE (SET_DEST (PATTERN (insn))) == SUBREG)
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&& rtx_equal_p (SET_DEST (PATTERN (insn)),
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SET_SRC (PATTERN (insn))))
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;
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else if (GET_CODE (SET_DEST (PATTERN (insn))) == STRICT_LOW_PART
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&& rtx_equal_p (XEXP (SET_DEST (PATTERN (insn)), 0),
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SET_SRC (PATTERN (insn))))
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if (set_noop_p (PATTERN (insn)))
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;
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#ifdef HAVE_cc0
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@ -7649,9 +7642,7 @@ delete_trivially_dead_insns (insns, nreg)
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if (GET_CODE (elt) == SET)
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{
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if ((GET_CODE (SET_DEST (elt)) == REG
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|| GET_CODE (SET_DEST (elt)) == SUBREG)
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&& rtx_equal_p (SET_DEST (elt), SET_SRC (elt)))
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if (set_noop_p (elt))
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;
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#ifdef HAVE_cc0
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22
gcc/flow.c
22
gcc/flow.c
@ -386,7 +386,6 @@ static void tidy_fallthru_edges PARAMS ((void));
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static int verify_wide_reg_1 PARAMS ((rtx *, void *));
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static void verify_wide_reg PARAMS ((int, rtx, rtx));
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static void verify_local_live_at_start PARAMS ((regset, basic_block));
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static int set_noop_p PARAMS ((rtx));
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static int noop_move_p PARAMS ((rtx));
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static void delete_noop_moves PARAMS ((rtx));
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static void notice_stack_pointer_modification_1 PARAMS ((rtx, rtx, void *));
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@ -3077,27 +3076,6 @@ free_basic_block_vars (keep_head_end_p)
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}
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}
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/* Return nonzero if the destination of SET equals the source. */
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static int
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set_noop_p (set)
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rtx set;
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{
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rtx src = SET_SRC (set);
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rtx dst = SET_DEST (set);
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if (GET_CODE (src) == SUBREG && GET_CODE (dst) == SUBREG)
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{
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if (SUBREG_BYTE (src) != SUBREG_BYTE (dst))
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return 0;
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src = SUBREG_REG (src);
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dst = SUBREG_REG (dst);
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}
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return (GET_CODE (src) == REG && GET_CODE (dst) == REG
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&& REGNO (src) == REGNO (dst));
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}
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/* Return nonzero if an insn consists only of SETs, each of which only sets a
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value to itself. */
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@ -1964,7 +1964,7 @@ hash_scan_set (pat, insn, set_p)
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/* Is SET_SRC something we want to gcse? */
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&& want_to_gcse_p (src)
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/* Don't CSE a nop. */
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&& src != dest)
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&& ! set_noop_p (pat))
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{
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/* An expression is not anticipatable if its operands are
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modified before this insn or if this is not the only SET in
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20
gcc/jump.c
20
gcc/jump.c
@ -956,15 +956,7 @@ delete_noop_moves (f)
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/* Detect and delete no-op move instructions
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resulting from not allocating a parameter in a register. */
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if (GET_CODE (body) == SET
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&& (SET_DEST (body) == SET_SRC (body)
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|| (GET_CODE (SET_DEST (body)) == MEM
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&& GET_CODE (SET_SRC (body)) == MEM
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&& rtx_equal_p (SET_SRC (body), SET_DEST (body))))
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&& ! (GET_CODE (SET_DEST (body)) == MEM
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&& MEM_VOLATILE_P (SET_DEST (body)))
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&& ! (GET_CODE (SET_SRC (body)) == MEM
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&& MEM_VOLATILE_P (SET_SRC (body))))
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if (GET_CODE (body) == SET && set_noop_p (body))
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delete_computation (insn);
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/* Detect and ignore no-op move instructions
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@ -1073,16 +1065,6 @@ delete_noop_moves (f)
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if (i < 0)
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delete_insn (insn);
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}
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/* Also delete insns to store bit fields if they are no-ops. */
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/* Not worth the hair to detect this in the big-endian case. */
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else if (! BYTES_BIG_ENDIAN
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&& GET_CODE (body) == SET
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&& GET_CODE (SET_DEST (body)) == ZERO_EXTRACT
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&& XEXP (SET_DEST (body), 2) == const0_rtx
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&& XEXP (SET_DEST (body), 0) == SET_SRC (body)
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&& ! (GET_CODE (SET_SRC (body)) == MEM
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&& MEM_VOLATILE_P (SET_SRC (body))))
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delete_insn (insn);
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}
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insn = next;
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}
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@ -2882,7 +2882,7 @@ split_all_insns (upd_life)
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break the code that handles REG_NO_CONFLICT blocks. */
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else if ((set = single_set (insn)) != NULL
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&& rtx_equal_p (SET_SRC (set), SET_DEST (set)))
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&& set_noop_p (set))
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{
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/* Nops get in the way while scheduling, so delete them
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now if register allocation has already been done. It
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@ -1401,6 +1401,7 @@ extern int insn_dependent_p PARAMS ((rtx, rtx));
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extern int reg_set_p PARAMS ((rtx, rtx));
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extern rtx single_set_2 PARAMS ((rtx, rtx));
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extern int multiple_sets PARAMS ((rtx));
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extern int set_noop_p PARAMS ((rtx));
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extern rtx find_last_value PARAMS ((rtx, rtx *, rtx, int));
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extern int refers_to_regno_p PARAMS ((unsigned int, unsigned int,
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rtx, rtx *));
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@ -980,6 +980,42 @@ multiple_sets (insn)
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return 0;
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}
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/* Return nonzero if the destination of SET equals the source
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and there are no side effects. */
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int
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set_noop_p (set)
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rtx set;
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{
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rtx src = SET_SRC (set);
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rtx dst = SET_DEST (set);
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if (side_effects_p (src) || side_effects_p (dst))
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return 0;
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if (GET_CODE (dst) == MEM && GET_CODE (src) == MEM)
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return rtx_equal_p (dst, src);
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if (GET_CODE (dst) == SIGN_EXTRACT
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|| GET_CODE (dst) == ZERO_EXTRACT)
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return rtx_equal_p (XEXP (dst, 0), src)
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&& ! BYTES_BIG_ENDIAN && XEXP (dst, 2) == const0_rtx;
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if (GET_CODE (dst) == STRICT_LOW_PART)
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dst = XEXP (dst, 0);
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if (GET_CODE (src) == SUBREG && GET_CODE (dst) == SUBREG)
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{
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if (SUBREG_BYTE (src) != SUBREG_BYTE (dst))
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return 0;
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src = SUBREG_REG (src);
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dst = SUBREG_REG (dst);
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}
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return (GET_CODE (src) == REG && GET_CODE (dst) == REG
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&& REGNO (src) == REGNO (dst));
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}
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/* Return the last thing that X was assigned from before *PINSN. If VALID_TO
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is not NULL_RTX then verify that the object is not modified up to VALID_TO.
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If the object was modified, if we hit a partial assignment to X, or hit a
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