diff options
Diffstat (limited to 'gcc-4.4.3/gcc/tree-ssa-sccvn.c')
| -rw-r--r-- | gcc-4.4.3/gcc/tree-ssa-sccvn.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/gcc-4.4.3/gcc/tree-ssa-sccvn.c b/gcc-4.4.3/gcc/tree-ssa-sccvn.c index aa70b94d5..c1f71da54 100644 --- a/gcc-4.4.3/gcc/tree-ssa-sccvn.c +++ b/gcc-4.4.3/gcc/tree-ssa-sccvn.c @@ -1625,6 +1625,36 @@ set_ssa_val_to (tree from, tree to) return false; } +/* Fix up references to VOP SSANAMEs defined by STMT + which is to be removed. This function does not + fix up references in VUSE/VDEFs which need to be + handled seperately. */ + +void +fixup_vdef_ssa_val_refs (gimple stmt) +{ + struct voptype_d *vdefs; + tree var; + int i; + + vdefs = gimple_vdef_ops (stmt); + while (vdefs) + { + tree def_nm; + tree prev_nm; + + def_nm = VDEF_RESULT (vdefs); + prev_nm = VDEF_OP (vdefs, 0); + + for (i = 0; VEC_iterate (tree, SSANAMES (cfun), i, var); i++) + { + if (var && SSA_VAL (var) == def_nm) + set_ssa_val_to (var, prev_nm); + } + vdefs = vdefs->next; + } +} + /* Set all definitions in STMT to value number to themselves. Return true if a value number changed. */ |