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re PR rtl-optimization/47525 (DCE fails to eliminate a dead call to a pure function when compiled with -maltivec)

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PR rtl-optimization/47525
	* df-scan.c: Update copyright years.
	(df_get_call_refs): Do not mark global registers as DF_REF_REG_USE
	and non-clobber DF_REF_REG_DEF for calls to const and pure functions.

From-SVN: r169768
This commit is contained in:
Peter Bergner 2011-02-02 14:08:06 -06:00 committed by Peter Bergner
parent 8e2bc95be5
commit 9cd4f22a45
2 changed files with 21 additions and 11 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2011-02-02 Peter Bergner <bergner@vnet.ibm.com>
PR rtl-optimization/47525
* df-scan.c: Update copyright years.
(df_get_call_refs): Do not mark global registers as DF_REF_REG_USE
and non-clobber DF_REF_REG_DEF for calls to const and pure functions.
2011-02-02 Rainer Orth <ro@CeBiTec.Uni-Bielefeld.DE>
* config/i386/sysv4.h (TARGET_VERSION): Remove.

9
gcc/df-scan.c
View File

@ -1,6 +1,6 @@
/* Scanning of rtl for dataflow analysis.
Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007,
2008, 2009, 2010 Free Software Foundation, Inc.
2008, 2009, 2010, 2011 Free Software Foundation, Inc.
Originally contributed by Michael P. Hayes
(m.hayes@elec.canterbury.ac.nz, mhayes@redhat.com)
Major rewrite contributed by Danny Berlin (dberlin@dberlin.org)
@ -3360,13 +3360,16 @@ df_get_call_refs (struct df_collection_rec * collection_rec,
NULL, bb, insn_info, DF_REF_REG_USE,
DF_REF_CALL_STACK_USAGE | flags);
/* Calls may also reference any of the global registers,
so they are recorded as used. */
/* Calls to const functions cannot access any global registers and calls to
pure functions cannot set them. All other calls may reference any of the
global registers, so they are recorded as used. */
if (!RTL_CONST_CALL_P (insn_info->insn))
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
if (global_regs[i])
{
df_ref_record (DF_REF_BASE, collection_rec, regno_reg_rtx[i],
NULL, bb, insn_info, DF_REF_REG_USE, flags);
if (!RTL_PURE_CALL_P (insn_info->insn))
df_ref_record (DF_REF_BASE, collection_rec, regno_reg_rtx[i],
NULL, bb, insn_info, DF_REF_REG_DEF, flags);
}