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[dev.power64] cmd/9g: introduce ginscon2 for CMP/CMPU, use ginscon to ADD constants

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LGTM=rsc
R=rsc, iant
CC=golang-codereviews
https://golang.org/cl/125170043
This commit is contained in:
Shenghou Ma 2014-08-12 23:57:02 -04:00
parent 9b88857f75
commit 893f28ca16
3 changed files with 37 additions and 4 deletions
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6
src/cmd/9g/cgen.c
View File

@ -690,8 +690,7 @@ agenr(Node *n, Node *a, Node *res)
n1.xoffset = Array_nel;
regalloc(&n4, n1.type, N);
gmove(&n1, &n4);
nodconst(&n2, types[TUINT64], v);
gins(optoas(OCMP, types[TUINT64]), &n4, &n2);
ginscon2(optoas(OCMP, types[TUINT64]), &n4, v);
regfree(&n4);
p1 = gbranch(optoas(OGT, types[TUINT64]), T, +1);
ginscall(panicindex, 0);
@ -706,8 +705,7 @@ agenr(Node *n, Node *a, Node *res)
}
if (v*w != 0) {
nodconst(&n2, types[tptr], v*w);
gins(optoas(OADD, types[tptr]), &n2, &n3);
ginscon(optoas(OADD, types[tptr]), v*w, &n3);
}
*a = n3;
break;

1
src/cmd/9g/gg.h
View File

@ -87,6 +87,7 @@ Node* nodarg(Type*, int);
void nodreg(Node*, Type*, int);
void nodindreg(Node*, Type*, int);
void ginscon(int, vlong, Node*);
void ginscon2(int, Node*, vlong);
void buildtxt(void);
Plist* newplist(void);
int isfat(Type*);

34
src/cmd/9g/gsubr.c
View File

@ -562,6 +562,40 @@ ginscon(int as, vlong c, Node *n2)
gins(as, &n1, n2);
}
/*
* generate
* as n, $c (CMP/CMPU)
*/
void
ginscon2(int as, Node *n2, vlong c)
{
Node n1, ntmp;
nodconst(&n1, types[TINT64], c);
switch(as) {
default:
fatal("ginscon2");
case ACMP:
if(-BIG <= c && c <= BIG) {
gins(as, n2, &n1);
return;
}
break;
case ACMPU:
if(0 <= c && c <= 2*BIG) {
gins(as, n2, &n1);
return;
}
break;
}
// MOV n1 into register first
regalloc(&ntmp, types[TINT64], N);
gins(AMOVD, &n1, &ntmp);
gins(as, n2, &ntmp);
regfree(&ntmp);
}
#define CASE(a,b) (((a)<<16)|((b)<<0))
/*c2go int CASE(int, int); */