diff options
Diffstat (limited to 'gcc/tree-if-conv.c')
| -rw-r--r-- | gcc/tree-if-conv.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/gcc/tree-if-conv.c b/gcc/tree-if-conv.c index 6e298d3..36a879d 100644 --- a/gcc/tree-if-conv.c +++ b/gcc/tree-if-conv.c @@ -1409,6 +1409,8 @@ is_cond_scalar_reduction (gimple phi, gimple *reduc, enum tree_code reduction_op; struct loop *loop = gimple_bb (phi)->loop_father; edge latch_e = loop_latch_edge (loop); + imm_use_iterator imm_iter; + use_operand_p use_p; arg_0 = PHI_ARG_DEF (phi, 0); arg_1 = PHI_ARG_DEF (phi, 1); @@ -1465,6 +1467,18 @@ is_cond_scalar_reduction (gimple phi, gimple *reduc, else if (r_op1 != PHI_RESULT (header_phi)) return false; + /* Check that R_OP1 is used in reduction stmt or in PHI only. */ + FOR_EACH_IMM_USE_FAST (use_p, imm_iter, r_op1) + { + gimple use_stmt = USE_STMT (use_p); + if (is_gimple_debug (use_stmt)) + continue; + if (use_stmt == stmt) + continue; + if (gimple_code (use_stmt) != GIMPLE_PHI) + return false; + } + *op0 = r_op1; *op1 = r_op2; *reduc = stmt; return true; |