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A 2% speed improvement with gcc on low-endian machines. My guess is that this 

new pattern for NEXTARG() is detected and optimized as a single (*short)
loading.
This commit is contained in:
Armin Rigo 2004-03-20 20:03:17 +00:00
parent 09240f65f8
commit 1515fc2a01
1 changed files with 10 additions and 6 deletions
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16
Python/ceval.c
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@ -627,7 +627,8 @@ eval_frame(PyFrameObject *f)
#define INSTR_OFFSET() (next_instr - first_instr)
#define NEXTOP() (*next_instr++)
#define NEXTARG() (next_instr += 2, (next_instr[-1]<<8) + next_instr[-2])
#define OPARG() (next_instr[0] + (next_instr[1]<<8))
#define OPARG_SIZE 2
#define JUMPTO(x) (next_instr = first_instr + (x))
#define JUMPBY(x) (next_instr += (x))
@ -658,8 +659,7 @@ eval_frame(PyFrameObject *f)
#endif
#define PREDICTED(op) PRED_##op: next_instr++
#define PREDICTED_WITH_ARG(op) PRED_##op: oparg = (next_instr[2]<<8) + \
next_instr[1]; next_instr += 3
#define PREDICTED_WITH_ARG(op) PRED_##op: next_instr++; oparg = OPARG(); next_instr += OPARG_SIZE
/* Stack manipulation macros */
@ -862,8 +862,11 @@ eval_frame(PyFrameObject *f)
/* Extract opcode and argument */
opcode = NEXTOP();
if (HAS_ARG(opcode))
oparg = NEXTARG();
if (HAS_ARG(opcode)) {
oparg = OPARG();
next_instr += OPARG_SIZE;
}
dispatch_opcode:
#ifdef DYNAMIC_EXECUTION_PROFILE
#ifdef DXPAIRS
@ -2249,7 +2252,8 @@ eval_frame(PyFrameObject *f)
case EXTENDED_ARG:
opcode = NEXTOP();
oparg = oparg<<16 | NEXTARG();
oparg = oparg<<16 | OPARG();
next_instr += OPARG_SIZE;
goto dispatch_opcode;
default: