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Diffstat (limited to 'gcc/tree-ssa-live.c')
| -rw-r--r-- | gcc/tree-ssa-live.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/gcc/tree-ssa-live.c b/gcc/tree-ssa-live.c index 1effb43..22013e0 100644 --- a/gcc/tree-ssa-live.c +++ b/gcc/tree-ssa-live.c @@ -57,6 +57,7 @@ along with GCC; see the file COPYING3. If not see #include "diagnostic-core.h" #include "debug.h" #include "flags.h" +#include "tree-ssa.h" #ifdef ENABLE_CHECKING static void verify_live_on_entry (tree_live_info_p); @@ -1103,6 +1104,10 @@ set_var_live_on_entry (tree ssa_name, tree_live_info_p live) else def_bb = ENTRY_BLOCK_PTR_FOR_FN (cfun); + /* An undefined local variable does not need to be very alive. */ + if (ssa_undefined_value_p (ssa_name, false)) + return; + /* Visit each use of SSA_NAME and if it isn't in the same block as the def, add it to the list of live on entry blocks. */ FOR_EACH_IMM_USE_FAST (use, imm_iter, ssa_name) @@ -1439,6 +1444,11 @@ verify_live_on_entry (tree_live_info_p live) else if (d == var) { + /* An undefined local variable does not need to be very + alive. */ + if (ssa_undefined_value_p (var, false)) + continue; + /* The only way this var shouldn't be marked live on entry is if it occurs in a PHI argument of the block. */ size_t z; |