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cmd/[568]g: explain the purpose of various Reg fields.

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R=golang-dev, rsc
CC=golang-dev, remy
https://golang.org/cl/6554062
This commit is contained in:
Rémy Oudompheng 2012-09-24 20:55:11 +02:00
parent afa233a893
commit 5e3fb887a3
3 changed files with 36 additions and 24 deletions
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20
src/cmd/5g/opt.h
View File

@ -49,12 +49,16 @@
typedef struct Reg Reg; typedef struct Reg Reg;
typedef struct Rgn Rgn; typedef struct Rgn Rgn;
// A Reg is a wrapper around a single Prog (one instruction) that holds
// register optimization information while the optimizer runs.
// r->prog is the instruction.
// r->prog->regp points back to r.
struct Reg struct Reg
{ {
Bits set; Bits set; // variables written by this instruction.
Bits use1; Bits use1; // variables read by prog->from.
Bits use2; Bits use2; // variables read by prog->to.
Bits refbehind; Bits refbehind;
Bits refahead; Bits refahead;
@ -70,13 +74,13 @@ struct Reg
uint16 loop; // x5 for every loop uint16 loop; // x5 for every loop
uchar refset; // diagnostic generated uchar refset; // diagnostic generated
Reg* p1; Reg* p1; // predecessors of this instruction: p1,
Reg* p2; Reg* p2; // and then p2 linked though p2link.
Reg* p2link; Reg* p2link;
Reg* s1; Reg* s1; // successors of this instruction (at most two: s1 and s2).
Reg* s2; Reg* s2;
Reg* link; Reg* link; // next instruction in function code
Prog* prog; Prog* prog; // actual instruction
}; };
#define R ((Reg*)0) #define R ((Reg*)0)

20
src/cmd/6g/opt.h
View File

@ -49,12 +49,16 @@
typedef struct Reg Reg; typedef struct Reg Reg;
typedef struct Rgn Rgn; typedef struct Rgn Rgn;
// A Reg is a wrapper around a single Prog (one instruction) that holds
// register optimization information while the optimizer runs.
// r->prog is the instruction.
// r->prog->regp points back to r.
struct Reg struct Reg
{ {
Bits set; Bits set; // variables written by this instruction.
Bits use1; Bits use1; // variables read by prog->from.
Bits use2; Bits use2; // variables read by prog->to.
Bits refbehind; Bits refbehind;
Bits refahead; Bits refahead;
@ -70,13 +74,13 @@ struct Reg
uint16 loop; // x5 for every loop uint16 loop; // x5 for every loop
uchar refset; // diagnostic generated uchar refset; // diagnostic generated
Reg* p1; Reg* p1; // predecessors of this instruction: p1,
Reg* p2; Reg* p2; // and then p2 linked though p2link.
Reg* p2link; Reg* p2link;
Reg* s1; Reg* s1; // successors of this instruction (at most two: s1 and s2).
Reg* s2; Reg* s2;
Reg* link; Reg* link; // next instruction in function code
Prog* prog; Prog* prog; // actual instruction
}; };
#define R ((Reg*)0) #define R ((Reg*)0)

20
src/cmd/8g/opt.h
View File

@ -47,12 +47,16 @@
typedef struct Reg Reg; typedef struct Reg Reg;
typedef struct Rgn Rgn; typedef struct Rgn Rgn;
// A Reg is a wrapper around a single Prog (one instruction) that holds
// register optimization information while the optimizer runs.
// r->prog is the instruction.
// r->prog->regp points back to r.
struct Reg struct Reg
{ {
Bits set; Bits set; // variables written by this instruction.
Bits use1; Bits use1; // variables read by prog->from.
Bits use2; Bits use2; // variables read by prog->to.
Bits refbehind; Bits refbehind;
Bits refahead; Bits refahead;
@ -68,13 +72,13 @@ struct Reg
uint16 loop; // x5 for every loop uint16 loop; // x5 for every loop
uchar refset; // diagnostic generated uchar refset; // diagnostic generated
Reg* p1; Reg* p1; // predecessors of this instruction: p1,
Reg* p2; Reg* p2; // and then p2 linked though p2link.
Reg* p2link; Reg* p2link;
Reg* s1; Reg* s1; // successors of this instruction (at most two: s1 and s2).
Reg* s2; Reg* s2;
Reg* link; Reg* link; // next instruction in function code
Prog* prog; Prog* prog; // actual instruction
}; };
#define R ((Reg*)0) #define R ((Reg*)0)