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JIT compiler update.

This commit is contained in:
Zoltán Herczeg 2018-08-13 09:21:18 +00:00
parent 1a8cc3dab6
commit 438446ebe7
4 changed files with 21 additions and 13 deletions
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3
src/config.h.in
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@ -144,7 +144,8 @@ sure both macros are undefined; an emulation function will then be used. */
instead. This allows for longer patterns in extreme cases. */ instead. This allows for longer patterns in extreme cases. */
#undef LINK_SIZE #undef LINK_SIZE
/* Define to the sub-directory where libtool stores uninstalled libraries. */ /* Define to the sub-directory in which libtool stores uninstalled libraries.
*/
#undef LT_OBJDIR #undef LT_OBJDIR
/* The value of MATCH_LIMIT determines the default number of times the /* The value of MATCH_LIMIT determines the default number of times the

2
src/sljit/sljitConfigInternal.h
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@ -66,7 +66,7 @@
SLJIT_RETURN_ADDRESS_OFFSET : a return instruction always adds this offset to the return address SLJIT_RETURN_ADDRESS_OFFSET : a return instruction always adds this offset to the return address
Other macros: Other macros:
SLJIT_FUNC : calling convention attribute for both calling JIT form C and C calling back from JIT SLJIT_FUNC : calling convention attribute for both calling JIT from C and C calling back from JIT
SLJIT_W(number) : defining 64 bit constants on 64 bit architectures (compiler independent helper) SLJIT_W(number) : defining 64 bit constants on 64 bit architectures (compiler independent helper)
*/ */

9
src/sljit/sljitExecAllocator.c
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@ -99,7 +99,14 @@ static SLJIT_INLINE void* alloc_chunk(sljit_uw size)
void *retval; void *retval;
#ifdef MAP_ANON #ifdef MAP_ANON
retval = mmap(NULL, size, PROT_READ | PROT_WRITE | PROT_EXEC, MAP_PRIVATE | MAP_ANON, -1, 0);
int flags = MAP_PRIVATE | MAP_ANON;
#ifdef MAP_JIT
flags |= MAP_JIT;
#endif
retval = mmap(NULL, size, PROT_READ | PROT_WRITE | PROT_EXEC, flags, -1, 0);
#else #else
if (dev_zero < 0) { if (dev_zero < 0) {
if (open_dev_zero()) if (open_dev_zero())

20
src/sljit/sljitLir.h
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@ -138,7 +138,7 @@ of sljitConfigInternal.h */
be specified as scratch registers and the fifth one as saved register be specified as scratch registers and the fifth one as saved register
on the CPU above and any user code which requires four scratch on the CPU above and any user code which requires four scratch
registers can run unmodified. The SLJIT compiler automatically saves registers can run unmodified. The SLJIT compiler automatically saves
the content of the two extra scrath register on the stack. Scratch the content of the two extra scratch register on the stack. Scratch
registers can also be preserved by saving their value on the stack registers can also be preserved by saving their value on the stack
but this needs to be done manually. but this needs to be done manually.
@ -746,7 +746,7 @@ SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_fast_return(struct sljit_compiler
be mixed. The only exception is SLJIT_MOV32 and SLJIT_MOVU32 whose source be mixed. The only exception is SLJIT_MOV32 and SLJIT_MOVU32 whose source
register can hold any 32 or 64 bit value, and it is converted to a 32 bit register can hold any 32 or 64 bit value, and it is converted to a 32 bit
compatible format first. This conversion is free (no instructions are compatible format first. This conversion is free (no instructions are
emitted) on most CPUs. A 32 bit value can also be coverted to a 64 bit emitted) on most CPUs. A 32 bit value can also be converted to a 64 bit
value by SLJIT_MOV_S32 (sign extension) or SLJIT_MOV_U32 (zero extension). value by SLJIT_MOV_S32 (sign extension) or SLJIT_MOV_U32 (zero extension).
Note: memory addressing always uses 64 bit values on 64 bit systems so Note: memory addressing always uses 64 bit values on 64 bit systems so
@ -773,8 +773,8 @@ SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_fast_return(struct sljit_compiler
*/ */
#define SLJIT_F32_OP SLJIT_I32_OP #define SLJIT_F32_OP SLJIT_I32_OP
/* Many CPUs (x86, ARM, PPC) has status flags which can be set according /* Many CPUs (x86, ARM, PPC) have status flags which can be set according
to the result of an operation. Other CPUs (MIPS) does not have status to the result of an operation. Other CPUs (MIPS) do not have status
flags, and results must be stored in registers. To cover both architecture flags, and results must be stored in registers. To cover both architecture
types efficiently only two flags are defined by SLJIT: types efficiently only two flags are defined by SLJIT:
@ -810,14 +810,14 @@ SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_fast_return(struct sljit_compiler
Using these flags can reduce the number of emitted instructions. E.g. a Using these flags can reduce the number of emitted instructions. E.g. a
fast loop can be implemented by decreasing a counter register and set the fast loop can be implemented by decreasing a counter register and set the
zero flag to jump back if the counter register is not reached zero. zero flag to jump back if the counter register has not reached zero.
Motivation: although CPUs can set a large number of flags, usually their Motivation: although CPUs can set a large number of flags, usually their
values are ignored or only one of them is used. Emulating a large number values are ignored or only one of them is used. Emulating a large number
of flags on systems without flag register is complicated so SLJIT of flags on systems without flag register is complicated so SLJIT
instructions must specify the flag they want to use and only that flag instructions must specify the flag they want to use and only that flag
will be emulated. The last arithmetic instruction can be repeated if will be emulated. The last arithmetic instruction can be repeated if
multiple flags needs to be checked. multiple flags need to be checked.
*/ */
/* Set Zero status flag. */ /* Set Zero status flag. */
@ -884,7 +884,7 @@ SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_op0(struct sljit_compiler *compile
/* Starting index of opcodes for sljit_emit_op1. */ /* Starting index of opcodes for sljit_emit_op1. */
#define SLJIT_OP1_BASE 32 #define SLJIT_OP1_BASE 32
/* The MOV instruction transfer data from source to destination. /* The MOV instruction transfers data from source to destination.
MOV instruction suffixes: MOV instruction suffixes:
@ -1156,7 +1156,7 @@ SLJIT_API_FUNC_ATTRIBUTE struct sljit_label* sljit_emit_label(struct sljit_compi
#define SLJIT_FAST_CALL 25 #define SLJIT_FAST_CALL 25
/* Called function must be declared with the SLJIT_FUNC attribute. */ /* Called function must be declared with the SLJIT_FUNC attribute. */
#define SLJIT_CALL 26 #define SLJIT_CALL 26
/* Called function must be decalred with cdecl attribute. /* Called function must be declared with cdecl attribute.
This is the default attribute for C functions. */ This is the default attribute for C functions. */
#define SLJIT_CALL_CDECL 27 #define SLJIT_CALL_CDECL 27
@ -1210,7 +1210,7 @@ SLJIT_API_FUNC_ATTRIBUTE void sljit_set_label(struct sljit_jump *jump, struct sl
/* Set the destination address of the jump to this label. */ /* Set the destination address of the jump to this label. */
SLJIT_API_FUNC_ATTRIBUTE void sljit_set_target(struct sljit_jump *jump, sljit_uw target); SLJIT_API_FUNC_ATTRIBUTE void sljit_set_target(struct sljit_jump *jump, sljit_uw target);
/* Emit an indirect jump or fast call. Both direct and indirect form /* Emit an indirect jump or fast call.
Direct form: set src to SLJIT_IMM() and srcw to the address Direct form: set src to SLJIT_IMM() and srcw to the address
Indirect form: any other valid addressing mode Indirect form: any other valid addressing mode
type must be between SLJIT_JUMP and SLJIT_FAST_CALL type must be between SLJIT_JUMP and SLJIT_FAST_CALL
@ -1274,7 +1274,7 @@ SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_cmov(struct sljit_compiler *compil
#define SLJIT_MEM_POST 0x1000 #define SLJIT_MEM_POST 0x1000
/* Emit a single memory load or store with update instruction. When the /* Emit a single memory load or store with update instruction. When the
requested instruction from is not supported by the CPU, it returns requested instruction form is not supported by the CPU, it returns
with SLJIT_ERR_UNSUPPORTED instead of emulating the instruction. This with SLJIT_ERR_UNSUPPORTED instead of emulating the instruction. This
allows specializing tight loops based on the supported instruction allows specializing tight loops based on the supported instruction
forms (see SLJIT_MEM_SUPP flag). forms (see SLJIT_MEM_SUPP flag).