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re PR rtl-optimization/15068 (ICE in elim_reg_cond)

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PR rtl-optimization/15068
	* flow.c (init_propagate_block_info): Check condition is reversible.

From-SVN: r85439
This commit is contained in:
Paul Brook 2004-08-02 13:19:39 +00:00 committed by Paul Brook
parent 9e2878cff2
commit 8965ece104
2 changed files with 13 additions and 5 deletions

5
gcc/ChangeLog

@ -1,3 +1,8 @@
2004-08-02 Paul Brook <paul@codesourcery.com>
PR rtl-optimization/15068
* flow.c (init_propagate_block_info): Check condition is reversible.
2004-08-02 Gabriel Dos Reis <gdr@integrable-solutions.net>
* gengtype.h (options::info): Change type to const char *.

13
gcc/flow.c

@ -1865,19 +1865,22 @@ init_propagate_block_info (basic_block bb, regset live, regset local_set,
rtx set_src = SET_SRC (pc_set (BB_END (bb)));
rtx cond_true = XEXP (set_src, 0);
rtx reg = XEXP (cond_true, 0);
enum rtx_code inv_cond;
if (GET_CODE (reg) == SUBREG)
reg = SUBREG_REG (reg);
/* We can only track conditional lifetimes if the condition is
in the form of a comparison of a register against zero.
If the condition is more complex than that, then it is safe
not to record any information. */
if (REG_P (reg)
in the form of a reversible comparison of a register against
zero. If the condition is more complex than that, then it is
safe not to record any information. */
inv_cond = reversed_comparison_code (cond_true, BB_END (bb));
if (inv_cond != UNKNOWN
&& REG_P (reg)
&& XEXP (cond_true, 1) == const0_rtx)
{
rtx cond_false
= gen_rtx_fmt_ee (reverse_condition (GET_CODE (cond_true)),
= gen_rtx_fmt_ee (inv_cond,
GET_MODE (cond_true), XEXP (cond_true, 0),
XEXP (cond_true, 1));
if (GET_CODE (XEXP (set_src, 1)) == PC)