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| author | Armin Rigo <arigo@tunes.org> | 2004-06-17 10:22:40 (GMT) |
|---|---|---|
| committer | Armin Rigo <arigo@tunes.org> | 2004-06-17 10:22:40 (GMT) |
| commit | 8817fcdba5b43662787fb8d32f62e62a5fd61569 (patch) | |
| tree | f956455b65333e4cb399a74e636ea178c4d57790 /Python | |
| parent | 64af6c545c67972fc492af5a69223f6ac46982b5 (diff) | |
| download | cpython-8817fcdba5b43662787fb8d32f62e62a5fd61569.zip cpython-8817fcdba5b43662787fb8d32f62e62a5fd61569.tar.gz cpython-8817fcdba5b43662787fb8d32f62e62a5fd61569.tar.bz2 | |
Performance tweak: allow stack_pointer and oparg to be register variables.
SF patch #943898
Diffstat (limited to 'Python')
| -rw-r--r-- | Python/ceval.c | 23 |
1 files changed, 16 insertions, 7 deletions
diff --git a/Python/ceval.c b/Python/ceval.c index a52168c..f66e318 100644 --- a/Python/ceval.c +++ b/Python/ceval.c @@ -464,10 +464,10 @@ eval_frame(PyFrameObject *f) #ifdef DXPAIRS int lastopcode = 0; #endif - PyObject **stack_pointer; /* Next free slot in value stack */ + register PyObject **stack_pointer; /* Next free slot in value stack */ register unsigned char *next_instr; - register int opcode=0; /* Current opcode */ - register int oparg=0; /* Current opcode argument, if any */ + register int opcode; /* Current opcode */ + register int oparg; /* Current opcode argument, if any */ register enum why_code why; /* Reason for block stack unwind */ register int err; /* Error status -- nonzero if error */ register PyObject *x; /* Result object -- NULL if error */ @@ -807,6 +807,8 @@ eval_frame(PyFrameObject *f) /* Extract opcode and argument */ opcode = NEXTOP(); + oparg = 0; /* allows oparg to be stored in a register because + it doesn't have to be remembered across a full loop */ if (HAS_ARG(opcode)) oparg = NEXTARG(); dispatch_opcode: @@ -2095,16 +2097,21 @@ eval_frame(PyFrameObject *f) continue; case CALL_FUNCTION: + { + PyObject **sp; PCALL(PCALL_ALL); + sp = stack_pointer; #ifdef WITH_TSC - x = call_function(&stack_pointer, oparg, &intr0, &intr1); + x = call_function(&sp, oparg, &intr0, &intr1); #else - x = call_function(&stack_pointer, oparg); + x = call_function(&sp, oparg); #endif + stack_pointer = sp; PUSH(x); if (x != NULL) continue; break; + } case CALL_FUNCTION_VAR: case CALL_FUNCTION_KW: @@ -2114,7 +2121,7 @@ eval_frame(PyFrameObject *f) int nk = (oparg>>8) & 0xff; int flags = (opcode - CALL_FUNCTION) & 3; int n = na + 2 * nk; - PyObject **pfunc, *func; + PyObject **pfunc, *func, **sp; PCALL(PCALL_ALL); if (flags & CALL_FLAG_VAR) n++; @@ -2135,13 +2142,15 @@ eval_frame(PyFrameObject *f) n++; } else Py_INCREF(func); + sp = stack_pointer; #ifdef WITH_TSC rdtscll(intr0); #endif - x = ext_do_call(func, &stack_pointer, flags, na, nk); + x = ext_do_call(func, &sp, flags, na, nk); #ifdef WITH_TSC rdtscll(intr1); #endif + stack_pointer = sp; Py_DECREF(func); while (stack_pointer > pfunc) { |