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authorjakub <jakub@138bc75d-0d04-0410-961f-82ee72b054a4>2007-07-02 12:57:22 +0000
committerjakub <jakub@138bc75d-0d04-0410-961f-82ee72b054a4>2007-07-02 12:57:22 +0000
commitfbb5d9ac63b5b0706772728d606f86e3932fb09f (patch)
treec0a145584c46c6fba31d9a163e5e01f7593c67b5 /gcc/tree-nrv.c
parent5bd657e9856eb98f31f0d40f371c94c81a6f44b8 (diff)
downloadgcc-fbb5d9ac63b5b0706772728d606f86e3932fb09f.tar.gz
* 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. git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@126200 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/tree-nrv.c')
-rw-r--r--gcc/tree-nrv.c37
1 files changed, 17 insertions, 20 deletions
diff --git a/gcc/tree-nrv.c b/gcc/tree-nrv.c
index 5a0db897252..fe812a92ab6 100644
--- a/gcc/tree-nrv.c
+++ b/gcc/tree-nrv.c
@@ -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