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| author | vmakarov <vmakarov@138bc75d-0d04-0410-961f-82ee72b054a4> | 2012-12-21 21:20:48 +0000 |
|---|---|---|
| committer | vmakarov <vmakarov@138bc75d-0d04-0410-961f-82ee72b054a4> | 2012-12-21 21:20:48 +0000 |
| commit | 47f6add2ea4f4bc1b9e7bcc817dad9b903568f18 (patch) | |
| tree | 710b9ff07f324f4591594dc3249e961c1dbf9d4c /gcc/lra-int.h | |
| parent | 4cadf1070f286debc2c1614d26fa9b581040641c (diff) | |
| download | gcc-47f6add2ea4f4bc1b9e7bcc817dad9b903568f18.tar.gz | |
2012-12-21 Vladimir Makarov <vmakarov@redhat.com>
PR middle-end/55775
* lra-assigns.c (improve_inheritance): Do nothing after
LRA_MAX_INHERITANCE_PASSES pass.
* lra-constraints.c (MAX_CONSTRAINT_ITERATION_NUMBER): Rename to
LRA_MAX_CONSTRAINT_ITERATION_NUMBER. Move to lra-int.h.
(MAX_INHERITANCE_PASSES): Rename to LRA_MAX_INHERITANCE_PASSES.
Move to lra-int.h.
* lra-int.h (LRA_MAX_CONSTRAINT_ITERATION_NUMBER): Move from
lra-constraints.c.
(LRA_MAX_INHERITANCE_PASSES): Ditto.
2012-12-21 Vladimir Makarov <vmakarov@redhat.com>
PR middle-end/55775
* gcc.target/i386/pr55775.c: New test.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@194680 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/lra-int.h')
| -rw-r--r-- | gcc/lra-int.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/gcc/lra-int.h b/gcc/lra-int.h index 8e89518bae0..064722936ba 100644 --- a/gcc/lra-int.h +++ b/gcc/lra-int.h @@ -249,6 +249,25 @@ typedef struct lra_insn_recog_data *lra_insn_recog_data_t; #define LRA_LOSER_COST_FACTOR 6 #define LRA_MAX_REJECT 600 +/* Maximum allowed number of constraint pass iterations after the last + spill pass. It is for preventing LRA cycling in a bug case. */ +#define LRA_MAX_CONSTRAINT_ITERATION_NUMBER 30 + +/* The maximal number of inheritance/split passes in LRA. It should + be more 1 in order to perform caller saves transformations and much + less MAX_CONSTRAINT_ITERATION_NUMBER to prevent LRA to do as many + as permitted constraint passes in some complicated cases. The + first inheritance/split pass has a biggest impact on generated code + quality. Each subsequent affects generated code in less degree. + For example, the 3rd pass does not change generated SPEC2000 code + at all on x86-64. */ +#define LRA_MAX_INHERITANCE_PASSES 2 + +#if LRA_MAX_INHERITANCE_PASSES <= 0 \ + || LRA_MAX_INHERITANCE_PASSES >= LRA_MAX_CONSTRAINT_ITERATION_NUMBER - 8 +#error wrong LRA_MAX_INHERITANCE_PASSES value +#endif + /* lra.c: */ extern FILE *lra_dump_file; |