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MUL+I / MUL+U simplification fixes. #21

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MUL+I / MUL+U simplification fixes. #21

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16 changes: 12 additions & 4 deletions src/simp.c
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Original file line number Diff line number Diff line change
Expand Up @@ -284,11 +284,14 @@ Tree simplify(int op, Type ty, Tree l, Tree r) {
break;

case MUL+U:
foldcnst(U,u,*);
commute(l,r);
if (l->op == CNST+U && (n = ispow2(l->u.v.u)) != 0)
return simplify(LSH, ty, r, cnsttree(inttype, (long)n));
foldcnst(U,u,*);
identity(r,l,U,u,1);
/* 0 * x => 0 */
if (l->op == CNST+U && l->u.v.u == 0)
return cnsttree(ty, 0L);
identity(l,r,U,u,1);
break;
case NE+I:
cfoldcnst(I,i,!=);
Expand Down Expand Up @@ -496,8 +499,8 @@ Tree simplify(int op, Type ty, Tree l, Tree r) {
commute(l,r);
break;
case MUL+I:
commute(l,r);
xfoldcnst(I,i,*,muli);
commute(l,r);
if (l->op == CNST+I && r->op == ADD+I && r->kids[1]->op == CNST+I)
/* c1*(x + c2) => c1*x + c1*c2 */
return simplify(ADD, ty, simplify(MUL, ty, l, r->kids[0]),
Expand All @@ -509,7 +512,12 @@ Tree simplify(int op, Type ty, Tree l, Tree r) {
if (l->op == CNST+I && l->u.v.i > 0 && (n = ispow2(l->u.v.i)) != 0)
/* 2^n * r => r<<n */
return simplify(LSH, ty, r, cnsttree(inttype, (long)n));
identity(r,l,I,i,1);

/* 0 * x => 0 */
if (l->op == CNST+I && l->u.v.i == 0)
return cnsttree(ty, 0L);

identity(l,r,I,i,1);
break;
case NE+F:
cfoldcnst(F,d,!=);
Expand Down