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tree-nrv.c (dest_safe_for_nrv_p): Grok any handled_component_p, SSA_NAMEs, RESULT_DECLs and PARM_DECLs. 

* tree-nrv.c (dest_safe_for_nrv_p): Grok any handled_component_p,
	SSA_NAMEs, RESULT_DECLs and PARM_DECLs.

	* g++.dg/opt/nrv12.C: New test.
	* gcc.target/i386/nrv1.c: New test.

From-SVN: r126200
This commit is contained in:
Jakub Jelinek 2007-07-02 14:57:22 +02:00 committed by Jakub Jelinek
parent 85b19f61bc
commit a2daf82cc2
5 changed files with 64 additions and 20 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2007-07-02 Jakub Jelinek <jakub@redhat.com>
* tree-nrv.c (dest_safe_for_nrv_p): Grok any handled_component_p,
SSA_NAMEs, RESULT_DECLs and PARM_DECLs.
2007-07-02 Richard Guenther <rguenther@suse.de>
* tree-ssa.c (useless_type_conversion_p): Document

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2007-07-02 Jakub Jelinek <jakub@redhat.com>
* g++.dg/opt/nrv12.C: New test.
* gcc.target/i386/nrv1.c: New test.
2007-07-02 Ira Rosen <irar@il.ibm.com>
PR tree-optimization/32230

25
gcc/testsuite/g++.dg/opt/nrv12.C Normal file
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@ -0,0 +1,25 @@
/* Verify that gimple-level NRV is occurring even for RESULT_DECLs. *./
/* { dg-do compile { target i?86-*-* x86_64-*-* } } */
/* { dg-options "-O -fdump-tree-optimized" } */
/* { dg-require-effective-target ilp32 } */
struct P
{
long long l;
int a;
unsigned int b;
P(long long x) : l(x) {}
};
P foo (P);
P bar (P);
P foo (P x)
{
P y = P (-1LL);
y = bar (x);
return y;
}
/* { dg-final { scan-tree-dump-times "return slot optimization" 1 "optimized" } } */
/* { dg-final { cleanup-tree-dump "optimized" } } */

12
gcc/testsuite/gcc.target/i386/nrv1.c Normal file
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@ -0,0 +1,12 @@
/* Verify that gimple-level NRV is occurring even for SSA_NAMEs. *./
/* { dg-do compile } */
/* { dg-options "-O -fdump-tree-optimized" } */
/* { dg-require-effective-target ilp32 } */
_Complex double foo (_Complex double x)
{
return __builtin_cexp (x);
}
/* { dg-final { scan-tree-dump-times "return slot optimization" 1 "optimized" } } */
/* { dg-final { cleanup-tree-dump "optimized" } } */

37
gcc/tree-nrv.c
View File

@ -250,26 +250,23 @@ struct tree_opt_pass pass_nrv =
static bool
dest_safe_for_nrv_p (tree dest)
{
switch (TREE_CODE (dest))
{
case VAR_DECL:
{
subvar_t subvar;
if (is_call_clobbered (dest))
return false;
for (subvar = get_subvars_for_var (dest);
subvar;
subvar = subvar->next)
if (is_call_clobbered (subvar->var))
return false;
return true;
}
case ARRAY_REF:
case COMPONENT_REF:
return dest_safe_for_nrv_p (TREE_OPERAND (dest, 0));
default:
return false;
}
subvar_t subvar;
while (handled_component_p (dest))
dest = TREE_OPERAND (dest, 0);
if (! SSA_VAR_P (dest))
return false;
if (TREE_CODE (dest) == SSA_NAME)
dest = SSA_NAME_VAR (dest);
if (is_call_clobbered (dest))
return false;
for (subvar = get_subvars_for_var (dest); subvar; subvar = subvar->next)
if (is_call_clobbered (subvar->var))
return false;
return true;
}
/* Walk through the function looking for GIMPLE_MODIFY_STMTs with calls that