diff options
Diffstat (limited to 'gcc/loop-doloop.c')
| -rw-r--r-- | gcc/loop-doloop.c | 26 |
1 files changed, 7 insertions, 19 deletions
diff --git a/gcc/loop-doloop.c b/gcc/loop-doloop.c index c6ef37e..4a2bb87 100644 --- a/gcc/loop-doloop.c +++ b/gcc/loop-doloop.c @@ -33,6 +33,7 @@ Software Foundation, 59 Temple Place - Suite 330, Boston, MA #include "cfgloop.h" #include "output.h" #include "params.h" +#include "target.h" /* This module is used to modify loops with a determinable number of iterations to use special low-overhead looping instructions. @@ -187,27 +188,14 @@ doloop_valid_p (struct loop *loop, struct niter_desc *desc) insn != NEXT_INSN (BB_END (bb)); insn = NEXT_INSN (insn)) { - /* A called function may clobber any special registers required for - low-overhead looping. */ - if (CALL_P (insn)) - { - if (dump_file) - fprintf (dump_file, "Doloop: Function call in loop.\n"); + /* Different targets have different necessities for low-overhead + looping. Call the back end for each instruction within the loop + to let it decide whether the insn is valid. */ + if (!targetm.insn_valid_within_doloop (insn)) + { result = false; goto cleanup; - } - - /* Some targets (eg, PPC) use the count register for branch on table - instructions. ??? This should be a target specific check. */ - if (JUMP_P (insn) - && (GET_CODE (PATTERN (insn)) == ADDR_DIFF_VEC - || GET_CODE (PATTERN (insn)) == ADDR_VEC)) - { - if (dump_file) - fprintf (dump_file, "Doloop: Computed branch in the loop.\n"); - result = false; - goto cleanup; - } + } } } result = true; |