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Diffstat (limited to 'gcc/tree-ssa-phiopt.c')
| -rw-r--r-- | gcc/tree-ssa-phiopt.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/gcc/tree-ssa-phiopt.c b/gcc/tree-ssa-phiopt.c index 633ccc7..d46ba62 100644 --- a/gcc/tree-ssa-phiopt.c +++ b/gcc/tree-ssa-phiopt.c @@ -1277,8 +1277,16 @@ minmax_replacement (basic_block cond_bb, basic_block middle_bb, gsi_move_before (&gsi_from, &gsi); } + /* Create an SSA var to hold the min/max result. If we're the only + things setting the target PHI, then we can clone the PHI + variable. Otherwise we must create a new one. */ + result = PHI_RESULT (phi); + if (EDGE_COUNT (gimple_bb (phi)->preds) == 2) + result = duplicate_ssa_name (result, NULL); + else + result = make_ssa_name (TREE_TYPE (result)); + /* Emit the statement to compute min/max. */ - result = duplicate_ssa_name (PHI_RESULT (phi), NULL); new_stmt = gimple_build_assign (result, minmax, arg0, arg1); gsi = gsi_last_bb (cond_bb); gsi_insert_before (&gsi, new_stmt, GSI_NEW_STMT); |