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kc: import various changes from charles forsyth

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This commit is contained in:
cinap_lenrek 2015-10-06 06:55:05 +02:00
parent fe3430ea99
commit 4a916ba86e
1 changed files with 45 additions and 26 deletions
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71
sys/src/cmd/kc/cgen.c
View file

@ -1,5 +1,7 @@
#include "gc.h"
static void genasop(int, Node*, Node*, Node*);
void
cgen(Node *n, Node *nn)
{
@ -217,6 +219,8 @@ cgen(Node *n, Node *nn)
regfree(&nod2);
break;
}
genasop(o, l, r, nn);
break;
case OASLMUL:
case OASLDIV:
@ -226,29 +230,7 @@ cgen(Node *n, Node *nn)
case OASMOD:
if(l->op == OBIT)
goto asbitop;
if(l->complex >= r->complex) {
if(l->addable < INDEXED)
reglcgen(&nod2, l, Z);
else
nod2 = *l;
regalloc(&nod, n, nn);
cgen(r, &nod);
} else {
regalloc(&nod, n, nn);
cgen(r, &nod);
if(l->addable < INDEXED)
reglcgen(&nod2, l, Z);
else
nod2 = *l;
}
regalloc(&nod1, n, Z);
gopcode(OAS, &nod2, Z, &nod1);
gopcode(o, &nod, &nod1, &nod);
gopcode(OAS, &nod, Z, &nod2);
regfree(&nod);
regfree(&nod1);
if(l->addable < INDEXED)
regfree(&nod2);
genasop(o, l, r, nn);
break;
asbitop:
@ -517,6 +499,43 @@ cgen(Node *n, Node *nn)
cursafe = curs;
}
static void
genasop(int o, Node *l, Node *r, Node *nn)
{
Node nod, nod1, nod2;
int hardleft;
hardleft = l->addable < INDEXED || l->complex >= FNX;
if(l->complex >= r->complex) {
if(hardleft)
reglcgen(&nod2, l, Z);
else
nod2 = *l;
regalloc(&nod1, r, Z);
cgen(r, &nod1);
} else {
regalloc(&nod1, r, Z);
cgen(r, &nod1);
if(hardleft)
reglcgen(&nod2, l, Z);
else
nod2 = *l;
}
if(nod1.type == nod2.type || !typefd[nod1.type->etype])
regalloc(&nod, &nod2, nn);
else
regalloc(&nod, &nod1, Z);
gmove(&nod2, &nod);
gopcode(o, &nod1, Z, &nod);
gmove(&nod, &nod2);
if(nn != Z)
gmove(&nod2, nn);
regfree(&nod);
regfree(&nod1);
if(hardleft)
regfree(&nod2);
}
void
reglcgen(Node *t, Node *n, Node *nn)
{
@ -835,12 +854,12 @@ sugen(Node *n, Node *nn, long w)
case OSTRUCT:
/*
* rewrite so lhs has no fn call
* rewrite so lhs has no side effects
*/
if(nn != Z && nn->complex >= FNX) {
if(nn != Z && side(nn)) {
nod1 = *n;
nod1.type = typ(TIND, n->type);
regret(&nod2, &nod1);
regalloc(&nod2, &nod1, Z);
lcgen(nn, &nod2);
regsalloc(&nod0, &nod1);
gopcode(OAS, &nod2, Z, &nod0);