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Prepare for SP-addressed locals

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* libguile/vm-engine.c: Renumber opcodes, and take the opportunity to
  fold recent additions into more logical places.  Be more precise when
  describing the encoding of operands, to shuffle local references only
  and not constants, immediates, or other such values.
  (SP_REF, SP_SET): New helpers.
  (BR_BINARY, BR_ARITHMETIC): Take full 24-bit operands.  Our shuffle
  strategy is to emit push when needed to bring far locals near, then
  pop afterwards, shuffling away far destination values as needed; but
  that doesn't work for conditionals, unless we introduce a trampoline.
  Let's just do the simple thing for now.  Native compilation will use
  condition codes.
  (push, pop, drop): Back from the dead!  We'll only use these for
  temporary shuffling though, when an opcode can't address the full
  24-bit range.
  (long-fmov): New instruction, like long-mov but relative to the frame
  pointer.
  (load-typed-array, make-array): Don't use a compressed encoding so
  that we can avoid the shuffling case.  It would be a pain, given that
  they have so many operands already.

* module/language/bytecode.scm (compute-instruction-arity): Update for
  new instrution word encodings.

* module/system/vm/assembler.scm: Update to expose some opcodes
  directly, without the need for shuffling wrappers.  Adapt to
  instruction word encodings change.

* module/system/vm/disassembler.scm (disassembler): Adapt to instruction
  coding change.
This commit is contained in:
Andy Wingo 2015-10-20 20:06:40 +02:00
parent 72353de77d
commit 0da0308b84
5 changed files with 494 additions and 386 deletions
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135
module/system/vm/assembler.scm
View file

@ -89,13 +89,13 @@
emit-br-if-struct
emit-br-if-char
emit-br-if-tc7
(emit-br-if-eq* . emit-br-if-eq)
(emit-br-if-eqv* . emit-br-if-eqv)
(emit-br-if-equal* . emit-br-if-equal)
(emit-br-if-=* . emit-br-if-=)
(emit-br-if-<* . emit-br-if-<)
(emit-br-if-<=* . emit-br-if-<=)
(emit-br-if-logtest* . emit-br-if-logtest)
emit-br-if-eq
emit-br-if-eqv
emit-br-if-equal
emit-br-if-=
emit-br-if-<
emit-br-if-<=
emit-br-if-logtest
(emit-mov* . emit-mov)
(emit-box* . emit-box)
(emit-box-ref* . emit-box-ref)
@ -153,7 +153,7 @@
(emit-struct-ref* . emit-struct-ref)
(emit-struct-set!* . emit-struct-set!)
(emit-class-of* . emit-class-of)
(emit-make-array* . emit-make-array)
emit-make-array
(emit-bv-u8-ref* . emit-bv-u8-ref)
(emit-bv-s8-ref* . emit-bv-s8-ref)
(emit-bv-u16-ref* . emit-bv-u16-ref)
@ -510,29 +510,38 @@ later by the linker."
(with-syntax ((opcode opcode))
(op-case
asm type
((U8_X24)
((X32)
(emit asm opcode))
((U8_U24 arg)
((X8_S24 arg)
(emit asm (pack-u8-u24 opcode arg)))
((U8_L24 label)
((X8_F24 arg)
(emit asm (pack-u8-u24 opcode arg)))
((X8_C24 arg)
(emit asm (pack-u8-u24 opcode arg)))
((X8_L24 label)
(record-label-reference asm label)
(emit asm opcode))
((U8_U8_I16 a imm)
((X8_S8_I16 a imm)
(emit asm (pack-u8-u8-u16 opcode a (object-address imm))))
((U8_U12_U12 a b)
((X8_S12_S12 a b)
(emit asm (pack-u8-u12-u12 opcode a b)))
((U8_U8_U8_U8 a b c)
((X8_S12_C12 a b)
(emit asm (pack-u8-u12-u12 opcode a b)))
((X8_C12_C12 a b)
(emit asm (pack-u8-u12-u12 opcode a b)))
((X8_F12_F12 a b)
(emit asm (pack-u8-u12-u12 opcode a b)))
((X8_S8_S8_S8 a b c)
(emit asm (pack-u8-u8-u8-u8 opcode a b c)))
((X8_S8_S8_C8 a b c)
(emit asm (pack-u8-u8-u8-u8 opcode a b c)))
((X8_S8_C8_S8 a b c)
(emit asm (pack-u8-u8-u8-u8 opcode a b c))))))
(define (pack-tail-word asm type)
(op-case
asm type
((U8_U24 a b)
(emit asm (pack-u8-u24 a b)))
((U8_L24 a label)
(record-label-reference asm label)
(emit asm a))
((U32 a)
((C32 a)
(emit asm a))
((I32 imm)
(let ((val (object-address imm)))
@ -548,7 +557,7 @@ later by the linker."
((N32 label)
(record-far-label-reference asm label)
(emit asm 0))
((S32 label)
((R32 label)
(record-far-label-reference asm label)
(emit asm 0))
((L32 label)
@ -558,21 +567,31 @@ later by the linker."
(record-far-label-reference asm label
(* offset (/ (asm-word-size asm) 4)))
(emit asm 0))
((X8_U24 a)
(emit asm (pack-u8-u24 0 a)))
((X8_L24 label)
(record-label-reference asm label)
(emit asm 0))
((C8_C24 a b)
(emit asm (pack-u8-u24 a b)))
((B1_X7_L24 a label)
(record-label-reference asm label)
(emit asm (pack-u1-u7-u24 (if a 1 0) 0 0)))
((B1_U7_L24 a b label)
((B1_C7_L24 a b label)
(record-label-reference asm label)
(emit asm (pack-u1-u7-u24 (if a 1 0) b 0)))
((B1_X31 a)
(emit asm (pack-u1-u7-u24 (if a 1 0) 0 0)))
((B1_X7_U24 a b)
(emit asm (pack-u1-u7-u24 (if a 1 0) 0 b)))))
((B1_X7_S24 a b)
(emit asm (pack-u1-u7-u24 (if a 1 0) 0 b)))
((B1_X7_F24 a b)
(emit asm (pack-u1-u7-u24 (if a 1 0) 0 b)))
((B1_X7_C24 a b)
(emit asm (pack-u1-u7-u24 (if a 1 0) 0 b)))
((X8_S24 a)
(emit asm (pack-u8-u24 0 a)))
((X8_F24 a)
(emit asm (pack-u8-u24 0 a)))
((X8_C24 a)
(emit asm (pack-u8-u24 0 a)))
((X8_L24 label)
(record-label-reference asm label)
(emit asm 0))))
(syntax-case x ()
((_ name opcode word0 word* ...)
@ -651,25 +670,44 @@ later by the linker."
#f)))
(op-case
word0
((U8_U8_I16 ! a imm)
(values (if (< a (ash 1 8)) a (begin (emit-mov* asm 253 a) 253))
imm))
((U8_U8_I16 <- a imm)
((X8_S8_I16 <- a imm)
(values (if (< a (ash 1 8)) a 253)
imm))
((U8_U12_U12 ! a b)
((X8_S12_S12 ! a b)
(values (if (< a (ash 1 12)) a (begin (emit-mov* asm 253 a) 253))
(if (< b (ash 1 12)) b (begin (emit-mov* asm 254 b) 254))))
((U8_U12_U12 <- a b)
((X8_S12_S12 <- a b)
(values (if (< a (ash 1 12)) a 253)
(if (< b (ash 1 12)) b (begin (emit-mov* asm 254 b) 254))))
((U8_U8_U8_U8 ! a b c)
((X8_S12_C12 <- a b)
(values (if (< a (ash 1 12)) a 253)
b))
((X8_S8_S8_S8 ! a b c)
(values (if (< a (ash 1 8)) a (begin (emit-mov* asm 253 a) 253))
(if (< b (ash 1 8)) b (begin (emit-mov* asm 254 b) 254))
(if (< c (ash 1 8)) c (begin (emit-mov* asm 255 c) 255))))
((U8_U8_U8_U8 <- a b c)
((X8_S8_S8_S8 <- a b c)
(values (if (< a (ash 1 8)) a 253)
(if (< b (ash 1 8)) b (begin (emit-mov* asm 254 b) 254))
(if (< c (ash 1 8)) c (begin (emit-mov* asm 255 c) 255))))
((X8_S8_S8_C8 ! a b c)
(values (if (< a (ash 1 8)) a (begin (emit-mov* asm 253 a) 253))
(if (< b (ash 1 8)) b (begin (emit-mov* asm 254 b) 254))
c))
((X8_S8_S8_C8 <- a b c)
(values (if (< a (ash 1 8)) a 253)
(if (< b (ash 1 8)) b (begin (emit-mov* asm 254 b) 254))
c))
((X8_S8_C8_S8 ! a b c)
(values (if (< a (ash 1 8)) a (begin (emit-mov* asm 253 a) 253))
b
(if (< c (ash 1 8)) c (begin (emit-mov* asm 255 c) 255))))
((X8_S8_C8_S8 <- a b c)
(values (if (< a (ash 1 8)) a 253)
b
(if (< c (ash 1 8)) c (begin (emit-mov* asm 255 c) 255))))))
(define (tail-formals type)
@ -682,22 +720,25 @@ later by the linker."
((op-case type)
(error "unmatched type" type))))
(op-case type
(U8_U24 a b)
(U8_L24 a label)
(U32 a)
(C32 a)
(I32 imm)
(A32 imm)
(B32)
(N32 label)
(S32 label)
(R32 label)
(L32 label)
(LO32 label offset)
(X8_U24 a)
(X8_L24 label)
(C8_C24 a b)
(B1_C7_L24 a b label)
(B1_X7_S24 a b)
(B1_X7_F24 a b)
(B1_X7_C24 a b)
(B1_X7_L24 a label)
(B1_U7_L24 a b label)
(B1_X31 a)
(B1_X7_U24 a b)))
(X8_S24 a)
(X8_F24 a)
(X8_C24 a)
(X8_L24 label)))
(define (shuffle-up dst)
(define-syntax op-case
@ -711,10 +752,10 @@ later by the linker."
(with-syntax ((dst dst))
(op-case
word0
((U8_U8_I16 U8_U8_U8_U8)
((X8_S8_I16 X8_S8_S8_S8 X8_S8_S8_C8 X8_S8_C8_S8)
(unless (< dst (ash 1 8))
(emit-mov* asm dst 253)))
((U8_U12_U12)
((X8_S12_S12 X8_S12_C12)
(unless (< dst (ash 1 12))
(emit-mov* asm dst 253))))))