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re PR rtl-optimization/13567 ([sh] miscompiling calls.c)

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PR optimization/13567
	* cse.c (cse_basic_block): Call cse_insn with a non-null
	libcall_insn for the last SET insn of a no-confilict block.

From-SVN: r76195
This commit is contained in:
Kaz Kojima 2004-01-20 02:34:23 +00:00
parent 9dfcd6092e
commit 26d107dba8
2 changed files with 24 additions and 2 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2004-01-20 Kaz Kojima <kkojima@gcc.gnu.org>
PR optimization/13567
* cse.c (cse_basic_block): Call cse_insn with a non-null
libcall_insn for the last SET insn of a no-confilict block.
2004-01-20 Kelley Cook <kcook@gcc.gnu.org>
* Makefile.in (target_noncanonical, program_transform_name): Use

20
gcc/cse.c
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@ -1,6 +1,6 @@
/* Common subexpression elimination for GNU compiler.
Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998
1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
This file is part of GCC.
@ -7108,6 +7108,7 @@ cse_basic_block (rtx from, rtx to, struct branch_path *next_branch,
int to_usage = 0;
rtx libcall_insn = NULL_RTX;
int num_insns = 0;
int no_conflict = 0;
/* This array is undefined before max_reg, so only allocate
the space actually needed and adjust the start. */
@ -7187,11 +7188,26 @@ cse_basic_block (rtx from, rtx to, struct branch_path *next_branch,
if ((p = find_reg_note (insn, REG_LIBCALL, NULL_RTX)))
libcall_insn = XEXP (p, 0);
else if (find_reg_note (insn, REG_RETVAL, NULL_RTX))
libcall_insn = 0;
{
/* Keep libcall_insn for the last SET insn of a no-conflict
block to prevent changing the destination. */
if (! no_conflict)
libcall_insn = 0;
else
no_conflict = -1;
}
else if (find_reg_note (insn, REG_NO_CONFLICT, NULL_RTX))
no_conflict = 1;
}
cse_insn (insn, libcall_insn);
if (no_conflict == -1)
{
libcall_insn = 0;
no_conflict = 0;
}
/* If we haven't already found an insn where we added a LABEL_REF,
check this one. */
if (GET_CODE (insn) == INSN && ! recorded_label_ref