diff options
| author | Andrew Waterman <waterman@cs.berkeley.edu> | 2015-07-06 23:37:56 -0700 |
|---|---|---|
| committer | Andrew Waterman <waterman@cs.berkeley.edu> | 2015-07-06 23:41:14 -0700 |
| commit | 49af88237073e0b656d2144356ae853a7574db8d (patch) | |
| tree | fba0281b4a9a7aa563471c4302fd08a7cbbed97d /gcc | |
| parent | b84d3753bf481903e7fa7f2a5f882686da1b7e9d (diff) | |
| download | riscv-gnu-toolchain-49af88237073e0b656d2144356ae853a7574db8d.zip riscv-gnu-toolchain-49af88237073e0b656d2144356ae853a7574db8d.tar.gz riscv-gnu-toolchain-49af88237073e0b656d2144356ae853a7574db8d.tar.bz2 | |
gcc: for -Os, avoid sibcalls when they hurt code size
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/gcc/config/riscv/riscv.c | 22 |
1 files changed, 21 insertions, 1 deletions
diff --git a/gcc/gcc/config/riscv/riscv.c b/gcc/gcc/config/riscv/riscv.c index d07814b..3ccb56d 100644 --- a/gcc/gcc/config/riscv/riscv.c +++ b/gcc/gcc/config/riscv/riscv.c @@ -216,6 +216,9 @@ struct GTY(()) machine_function { This area is allocated by the callee at the very top of the frame. */ int varargs_size; + /* Cached return value of leaf_function_p. <0 if false, >0 if true. */ + int is_leaf; + /* The current frame information, calculated by riscv_compute_frame_info. */ struct riscv_frame_info frame; }; @@ -4278,6 +4281,23 @@ riscv_trampoline_init (rtx m_tramp, tree fndecl, rtx chain_value) emit_insn (gen_clear_cache (addr, end_addr)); } +/* Implement TARGET_FUNCTION_OK_FOR_SIBCALL. */ + +static bool +riscv_function_ok_for_sibcall (tree decl, tree exp ATTRIBUTE_UNUSED) +{ + if (TARGET_SAVE_RESTORE) + { + /* When optimzing for size, don't use sibcalls in non-leaf routines */ + if (cfun->machine->is_leaf == 0) + cfun->machine->is_leaf = leaf_function_p () ? 1 : -1; + + return cfun->machine->is_leaf > 0; + } + + return true; +} + static bool riscv_lra_p (void) { @@ -4304,7 +4324,7 @@ riscv_lra_p (void) #define TARGET_SCHED_ISSUE_RATE riscv_issue_rate #undef TARGET_FUNCTION_OK_FOR_SIBCALL -#define TARGET_FUNCTION_OK_FOR_SIBCALL hook_bool_tree_tree_true +#define TARGET_FUNCTION_OK_FOR_SIBCALL riscv_function_ok_for_sibcall #undef TARGET_REGISTER_MOVE_COST #define TARGET_REGISTER_MOVE_COST riscv_register_move_cost |