diff options
Diffstat (limited to 'gcc-4.9/gcc/df-problems.c')
-rw-r--r-- | gcc-4.9/gcc/df-problems.c | 26 |
1 files changed, 23 insertions, 3 deletions
diff --git a/gcc-4.9/gcc/df-problems.c b/gcc-4.9/gcc/df-problems.c index 77f8c9922..a0b2175d2 100644 --- a/gcc-4.9/gcc/df-problems.c +++ b/gcc-4.9/gcc/df-problems.c @@ -42,6 +42,7 @@ along with GCC; see the file COPYING3. If not see #include "df.h" #include "except.h" #include "dce.h" +#include "basic-block.h" #include "valtrack.h" #include "dumpfile.h" @@ -59,6 +60,28 @@ static bitmap_head seen_in_insn; Utility functions. ----------------------------------------------------------------------------*/ +/* A helper function checking if UD/DU is large and dense. It returns true + if UD/DU can potentially consume huge amount of memory. Returns false + otherwise +*/ + +bool +df_check_ud_du_memory_usage (void) +{ + /* TODO: make this a target hook. The heuristic applies only to x86 in + m32 mode with -Os. In that mode 'push' instruction is used in argument + passing, with sp adjustment instruction after each function call. The + side effect is that the DU/UD becomes really dense. */ +#define DF_LARGE_FUNC 20000 + + if (optimize_size + && n_basic_blocks_for_fn (cfun) > DF_LARGE_FUNC) + return true; + + return false; +} + + /* Generic versions to get the void* version of the block info. Only used inside the problem instance vectors. */ @@ -4507,6 +4530,3 @@ df_md_add_problem (void) { df_add_problem (&problem_MD); } - - - |