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ifcvt.c (noce_process_if_block): Fail the conversion if X is referenced bewteen the condition and the jump.

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* ifcvt.c (noce_process_if_block): Fail the conversion if X is
        referenced bewteen the condition and the jump.  Don't delete
        anything but the jump.

From-SVN: r33563
This commit is contained in:
Richard Henderson 2000-04-30 23:55:44 -07:00 committed by Richard Henderson
parent 5724a0e641
commit c4686982aa
2 changed files with 17 additions and 6 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2000-04-30 Richard Henderson <rth@cygnus.com>
* ifcvt.c (noce_process_if_block): Fail the conversion if X is
referenced bewteen the condition and the jump. Don't delete
anything but the jump.
Sun Apr 30 22:48:24 2000 Jason Eckhardt <jle@cygnus.com>
* bb-reorder.c (scope_def): New struct.

17
gcc/ifcvt.c
View File

@ -1024,7 +1024,7 @@ noce_process_if_block (test_bb, then_bb, else_bb, join_bb)
rtx insn_a, insn_b;
rtx set_a, set_b;
rtx orig_x, x, a, b;
rtx jump, cond;
rtx jump, cond, insn;
/* If this is not a standard conditional jump, we can't parse it. */
jump = test_bb->end;
@ -1046,6 +1046,11 @@ noce_process_if_block (test_bb, then_bb, else_bb, join_bb)
x = SET_DEST (set_a);
a = SET_SRC (set_a);
/* X may not be mentioned between cond_earliest and the jump. */
for (insn = jump; insn != if_info.cond_earliest; insn = PREV_INSN (insn))
if (INSN_P (insn) && reg_mentioned_p (x, insn))
return FALSE;
/* Look for the other potential set. Make sure we've got equivalent
destinations. */
/* ??? This is overconservative. Storing to two different mems is
@ -1165,10 +1170,10 @@ noce_process_if_block (test_bb, then_bb, else_bb, join_bb)
}
/* The new insns will have been inserted before cond_earliest. We should
be able to remove cond_earliest through the jump with impunity. */
insn_a = prev_nonnote_insn (if_info.cond_earliest);
flow_delete_insn_chain (if_info.cond_earliest, test_bb->end);
test_bb->end = insn_a;
be able to remove the jump with impunity, but the condition itself may
have been modified by gcse to be shared across basic blocks. */
test_bb->end = PREV_INSN (jump);
flow_delete_insn (jump);
/* If we used a temporary, fix it up now. */
if (orig_x != x)
@ -1178,7 +1183,7 @@ noce_process_if_block (test_bb, then_bb, else_bb, join_bb)
insn_b = gen_sequence ();
end_sequence ();
test_bb->end = emit_insn_after (insn_b, insn_a);
test_bb->end = emit_insn_after (insn_b, test_bb->end);
}
/* Merge the blocks! */