diff options
Diffstat (limited to 'gcc/ifcvt.c')
| -rw-r--r-- | gcc/ifcvt.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/gcc/ifcvt.c b/gcc/ifcvt.c index e8fa0bd..ce60ce2 100644 --- a/gcc/ifcvt.c +++ b/gcc/ifcvt.c @@ -4167,13 +4167,14 @@ dead_or_predicable (basic_block test_bb, basic_block merge_bb, if (NONDEBUG_INSN_P (insn)) df_simulate_find_defs (insn, merge_set); +#ifdef HAVE_simple_return /* If shrink-wrapping, disable this optimization when test_bb is the first basic block and merge_bb exits. The idea is to not move code setting up a return register as that may clobber a register used to pass function parameters, which then must be saved in caller-saved regs. A caller-saved reg requires the prologue, killing a shrink-wrap opportunity. */ - if ((flag_shrink_wrap && !epilogue_completed) + if ((flag_shrink_wrap && HAVE_simple_return && !epilogue_completed) && ENTRY_BLOCK_PTR->next_bb == test_bb && single_succ_p (new_dest) && single_succ (new_dest) == EXIT_BLOCK_PTR @@ -4224,6 +4225,7 @@ dead_or_predicable (basic_block test_bb, basic_block merge_bb, } BITMAP_FREE (return_regs); } +#endif } no_body: |