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PPC: Add instruction/call decode + dispatch macros.

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Mike Pall 2010-08-31 00:05:10 +02:00
parent c7f91f8cd1
commit 4ef6564f2e
1 changed files with 67 additions and 0 deletions
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67
src/buildvm_ppc.dasc
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@ -139,6 +139,73 @@
|
|//-----------------------------------------------------------------------
|
|// Access to frame relative to BASE.
|.define FRAME_PC, -8
|.define FRAME_FUNC, -4
|
|// Instruction decode.
|.macro decode_OP4, dst, ins; rlwinm dst, ins, 2, 22, 29; .endmacro
|.macro decode_RA8, dst, ins; rlwinm dst, ins, 27, 21, 28; .endmacro
|.macro decode_RB8, dst, ins; rlwinm dst, ins, 11, 21, 28; .endmacro
|.macro decode_RC8, dst, ins; rlwinm dst, ins, 19, 21, 28; .endmacro
|.macro decode_RD8, dst, ins; rlwinm dst, ins, 19, 13, 28; .endmacro
|
|.macro decode_OP1, dst, ins; rlwinm dst, ins, 0, 24, 31; .endmacro
|.macro decode_RD4, dst, ins; rlwinm dst, ins, 18, 14, 29; .endmacro
|
|// Instruction decode+dispatch.
|.macro ins_NEXT
| lwz INS, 0(PC)
| addi PC, PC, 4
| decode_OP4 TMP0, INS
| decode_RB8 RB, INS
| lwzx TMP0, DISPATCH, TMP0
| decode_RD8 RD, INS
| decode_RC8 RC, INS
| mtctr TMP0
| decode_RA8 RA, INS
| bctr
|.endmacro
|
|// Instruction footer.
|.if 1
| // Replicated dispatch. Less unpredictable branches, but higher I-Cache use.
| .define ins_next, ins_NEXT
| .define ins_next_, ins_NEXT
|.else
| // Common dispatch. Lower I-Cache use, only one (very) unpredictable branch.
| // Affects only certain kinds of benchmarks (and only with -j off).
| .macro ins_next
| b ->ins_next
| .endmacro
| .macro ins_next_
| ->ins_next:
| ins_NEXT
| .endmacro
|.endif
|
|// Call decode and dispatch.
|.macro ins_callt
| // BASE = new base, RB = LFUNC/CFUNC, RC = nargs*8, FRAME_PC(BASE) = PC
| lwz PC, LFUNC:RB->pc
| lwz INS, 0(PC)
| addi PC, PC, 4
| decode_OP4 TMP0, INS
| decode_RA8 RA, INS
| lwzx TMP0, DISPATCH, TMP0
| add RA, RA, BASE
| mtctr TMP0
| bctr
|.endmacro
|
|.macro ins_call
| // BASE = new base, RB = LFUNC/CFUNC, RC = nargs*8, PC = caller PC
| stw PC, FRAME_PC(BASE)
| ins_callt
|.endmacro
|
|//-----------------------------------------------------------------------
|
|// Assumes DISPATCH is relative to GL.
#define DISPATCH_GL(field) (GG_DISP2G + (int)offsetof(global_State, field))
#define DISPATCH_J(field) (GG_DISP2J + (int)offsetof(jit_State, field))