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Diffstat (limited to 'gcc/tree-ssa-copy.c')
| -rw-r--r-- | gcc/tree-ssa-copy.c | 7 |
1 files changed, 2 insertions, 5 deletions
diff --git a/gcc/tree-ssa-copy.c b/gcc/tree-ssa-copy.c index 1d404d2..0ba665b 100644 --- a/gcc/tree-ssa-copy.c +++ b/gcc/tree-ssa-copy.c @@ -401,11 +401,8 @@ copy_prop_visit_phi_node (gimple phi) arg_value = valueize_val (arg); /* Avoid copy propagation from an inner into an outer loop. - Otherwise, this may move loop variant variables outside of - their loops and prevent coalescing opportunities. If the - value was loop invariant, it will be hoisted by LICM and - exposed for copy propagation. - ??? The value will be always loop invariant. + Otherwise, this may introduce uses of loop variant variables + outside of their loops and prevent coalescing opportunities. In loop-closed SSA form do not copy-propagate through PHI nodes in blocks with a loop exit edge predecessor. */ if (TREE_CODE (arg_value) == SSA_NAME |