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Commit 812f06b3 authored by Ken Thompson's avatar Ken Thompson
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another plateau - almost done 

only need to fix up certain
denominators

R=rsc
OCL=32928
CL=32928
parent 07044ba6
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Inline Side-by-side
Showing with 775 additions and 33 deletions
src/cmd/6g/ggen.c
View file @ 812f06b3
......@@ -601,16 +601,14 @@ cgen_div(int op, Node *nl, Node *nr, Node *res)
if(n < 0)
goto divbymul;
if(op == OMOD) {
// todo
goto longdiv;
}
switch(n) {
case 0:
// divide by 1
regalloc(&n1, nl->type, res);
cgen(nl, &n1);
if(op == OMOD) {
gins(optoas(OXOR, nl->type), &n1, &n1);
} else
if(s)
gins(optoas(OMINUS, nl->type), N, &n1);
gmove(&n1, res);
......@@ -618,6 +616,17 @@ cgen_div(int op, Node *nl, Node *nr, Node *res)
return;
case 1:
// divide by 2
if(op == OMOD) {
if(issigned[nl->type->etype])
goto longmod;
regalloc(&n1, nl->type, res);
cgen(nl, &n1);
nodconst(&n2, nl->type, 1);
gins(optoas(OAND, nl->type), &n2, &n1);
gmove(&n1, res);
regfree(&n1);
return;
}
regalloc(&n1, nl->type, res);
cgen(nl, &n1);
if(!issigned[nl->type->etype])
......@@ -632,6 +641,23 @@ cgen_div(int op, Node *nl, Node *nr, Node *res)
regfree(&n2);
break;
default:
if(op == OMOD) {
if(issigned[nl->type->etype])
goto longmod;
regalloc(&n1, nl->type, res);
cgen(nl, &n1);
nodconst(&n2, nl->type, mpgetfix(nr->val.u.xval)-1);
if(!smallintconst(&n2)) {
regalloc(&n3, nl->type, N);
gmove(&n2, &n3);
gins(optoas(OAND, nl->type), &n3, &n1);
regfree(&n3);
} else
gins(optoas(OAND, nl->type), &n2, &n1);
gmove(&n1, res);
regfree(&n1);
return;
}
regalloc(&n1, nl->type, res);
cgen(nl, &n1);
if(!issigned[nl->type->etype])
......@@ -657,6 +683,8 @@ cgen_div(int op, Node *nl, Node *nr, Node *res)
return;
divbymul:
// try to do division by multiply by (2^w)/d
// see hacker's delight chapter 10
switch(simtype[nl->type->etype]) {
default:
goto longdiv;
......@@ -669,14 +697,12 @@ divbymul:
umagic(&m);
if(m.bad)
break;
if(op == OMOD) {
// todo
break;
}
if(m.ua != 0) {
// todo fixup
break;
}
if(op == OMOD)
goto longmod;
savex(D_AX, &ax, &oldax, res, nl->type);
savex(D_DX, &dx, &olddx, res, nl->type);
......@@ -709,14 +735,12 @@ divbymul:
smagic(&m);
if(m.bad)
break;
if(op == OMOD) {
// todo
break;
}
if(m.sm < 0) {
// todo fixup
break;
}
if(op == OMOD)
goto longmod;
savex(D_AX, &ax, &oldax, res, nl->type);
savex(D_DX, &dx, &olddx, res, nl->type);
......@@ -751,11 +775,32 @@ divbymul:
goto longdiv;
longdiv:
// division and mod using (slow) hardware instruction
savex(D_AX, &ax, &oldax, res, nl->type);
savex(D_DX, &dx, &olddx, res, nl->type);
dodiv(op, nl, nr, res, &ax, &dx);
restx(&ax, &oldax);
restx(&dx, &olddx);
return;
longmod:
// mod using formula A%B = A-(A/B*B) but
// we know that there is a fast algorithm for A/B
regalloc(&n1, nl->type, res);
cgen(nl, &n1);
regalloc(&n2, nl->type, N);
cgen_div(ODIV, &n1, nr, &n2);
if(!smallintconst(nr)) {
regalloc(&n3, nl->type, N);
cgen(nr, &n3);
gins(optoas(OMUL, nl->type), &n3, &n2);
regfree(&n3);
} else
gins(optoas(OMUL, nl->type), nr, &n2);
gins(optoas(OSUB, nl->type), &n2, &n1);
gmove(&n1, res);
regfree(&n1);
regfree(&n2);
}
/*
......
test/ken/divconst.go
View file @ 812f06b3
......@@ -9,37 +9,363 @@ package main
import "rand"
func test(a,b,c int64);
const Count = 1e6
func
main()
i64rand() int64
{
for {
a := int64(rand.Uint32());
a = (a<<32) | int64(rand.Uint32());
a >>= uint(rand.Intn(64));
if -a != a {
return a;
}
}
return 0; // impossible
}
func
i64test(a,b,c int64)
{
d := a/c;
if d != b {
panicln("i64", a, b, c, d);
}
}
func
i64run()
{
var a, b int64;
for i:=0; i<1e6; i++ {
a := rand.Int63() - 1<<62;
b = a/1; test(a,b,1);
b = a/2; test(a,b,2);
b = a/3; test(a,b,3);
b = a/4; test(a,b,4);
b = a/5; test(a,b,5);
b = a/6; test(a,b,6);
b = a/7; test(a,b,7);
b = a/8; test(a,b,8);
b = a/16; test(a,b,16);
b = a/32; test(a,b,32);
b = a/64; test(a,b,64);
b = a/128; test(a,b,128);
b = a/256; test(a,b,256);
b = a/16384; test(a,b,16384);
for i:=0; i<Count; i++ {
a = i64rand();
b = a/1; i64test(a,b,1);
b = a/2; i64test(a,b,2);
b = a/3; i64test(a,b,3);
b = a/4; i64test(a,b,4);
b = a/5; i64test(a,b,5);
b = a/6; i64test(a,b,6);
b = a/7; i64test(a,b,7);
b = a/8; i64test(a,b,8);
b = a/10; i64test(a,b,10);
b = a/16; i64test(a,b,16);
b = a/20; i64test(a,b,20);
b = a/32; i64test(a,b,32);
b = a/60; i64test(a,b,60);
b = a/64; i64test(a,b,64);
b = a/128; i64test(a,b,128);
b = a/256; i64test(a,b,256);
b = a/16384; i64test(a,b,16384);
b = a/-1; i64test(a,b,-1);
b = a/-2; i64test(a,b,-2);
b = a/-3; i64test(a,b,-3);
b = a/-4; i64test(a,b,-4);
b = a/-5; i64test(a,b,-5);
b = a/-6; i64test(a,b,-6);
b = a/-7; i64test(a,b,-7);
b = a/-8; i64test(a,b,-8);
b = a/-10; i64test(a,b,-10);
b = a/-16; i64test(a,b,-16);
b = a/-20; i64test(a,b,-20);
b = a/-32; i64test(a,b,-32);
b = a/-60; i64test(a,b,-60);
b = a/-64; i64test(a,b,-64);
b = a/-128; i64test(a,b,-128);
b = a/-256; i64test(a,b,-256);
b = a/-16384; i64test(a,b,-16384);
}
}
func
u64rand() uint64
{
a := uint64(rand.Uint32());
a = (a<<32) | uint64(rand.Uint32());
a >>= uint(rand.Intn(64));
return a;
}
func
u64test(a,b,c uint64)
{
d := a/c;
if d != b {
panicln("u64", a, b, c, d);
}
}
func
u64run()
{
var a, b uint64;
for i:=0; i<Count; i++ {
a = u64rand();
b = a/1; u64test(a,b,1);
b = a/2; u64test(a,b,2);
b = a/3; u64test(a,b,3);
b = a/4; u64test(a,b,4);
b = a/5; u64test(a,b,5);
b = a/6; u64test(a,b,6);
b = a/7; u64test(a,b,7);
b = a/8; u64test(a,b,8);
b = a/10; u64test(a,b,10);
b = a/16; u64test(a,b,16);
b = a/20; u64test(a,b,20);
b = a/32; u64test(a,b,32);
b = a/60; u64test(a,b,60);
b = a/64; u64test(a,b,64);
b = a/128; u64test(a,b,128);
b = a/256; u64test(a,b,256);
b = a/16384; u64test(a,b,16384);
}
}
func
i32rand() int32
{
for {
a := int32(rand.Uint32());
a >>= uint(rand.Intn(32));
if -a != a {
return a;
}
}
return 0; // impossible
}
func
i32test(a,b,c int32)
{
d := a/c;
if d != b {
panicln("i32", a, b, c, d);
}
}
func
i32run()
{
var a, b int32;
for i:=0; i<Count; i++ {
a = i32rand();
b = a/1; i32test(a,b,1);
b = a/2; i32test(a,b,2);
b = a/3; i32test(a,b,3);
b = a/4; i32test(a,b,4);
b = a/5; i32test(a,b,5);
b = a/6; i32test(a,b,6);
b = a/7; i32test(a,b,7);
b = a/8; i32test(a,b,8);
b = a/10; i32test(a,b,10);
b = a/16; i32test(a,b,16);
b = a/20; i32test(a,b,20);
b = a/32; i32test(a,b,32);
b = a/60; i32test(a,b,60);
b = a/64; i32test(a,b,64);
b = a/128; i32test(a,b,128);
b = a/256; i32test(a,b,256);
b = a/16384; i32test(a,b,16384);
b = a/-1; i32test(a,b,-1);
b = a/-2; i32test(a,b,-2);
b = a/-3; i32test(a,b,-3);
b = a/-4; i32test(a,b,-4);
b = a/-5; i32test(a,b,-5);
b = a/-6; i32test(a,b,-6);
b = a/-7; i32test(a,b,-7);
b = a/-8; i32test(a,b,-8);
b = a/-10; i32test(a,b,-10);
b = a/-16; i32test(a,b,-16);
b = a/-20; i32test(a,b,-20);
b = a/-32; i32test(a,b,-32);
b = a/-60; i32test(a,b,-60);
b = a/-64; i32test(a,b,-64);
b = a/-128; i32test(a,b,-128);
b = a/-256; i32test(a,b,-256);
}
}
func
u32rand() uint32
{
a := uint32(rand.Uint32());
a >>= uint(rand.Intn(32));
return a;
}
func
u32test(a,b,c uint32)
{
d := a/c;
if d != b {
panicln("u32", a, b, c, d);
}
}
func
u32run()
{
var a, b uint32;
for i:=0; i<Count; i++ {
a = u32rand();
b = a/1; u32test(a,b,1);
b = a/2; u32test(a,b,2);
b = a/3; u32test(a,b,3);
b = a/4; u32test(a,b,4);
b = a/5; u32test(a,b,5);
b = a/6; u32test(a,b,6);
b = a/7; u32test(a,b,7);
b = a/8; u32test(a,b,8);
b = a/10; u32test(a,b,10);
b = a/16; u32test(a,b,16);
b = a/20; u32test(a,b,20);
b = a/32; u32test(a,b,32);
b = a/60; u32test(a,b,60);
b = a/64; u32test(a,b,64);
b = a/128; u32test(a,b,128);
b = a/256; u32test(a,b,256);
b = a/16384; u32test(a,b,16384);
}
}
func
i16rand() int16
{
for {
a := int16(rand.Uint32());
a >>= uint(rand.Intn(16));
if -a != a {
return a;
}
}
return 0; // impossible
}
func
i16test(a,b,c int16)
{
d := a/c;
if d != b {
panicln("i16", a, b, c, d);
}
}
func
i16run()
{
var a, b int16;
for i:=0; i<Count; i++ {
a = i16rand();
b = a/1; i16test(a,b,1);
b = a/2; i16test(a,b,2);
b = a/3; i16test(a,b,3);
b = a/4; i16test(a,b,4);
b = a/5; i16test(a,b,5);
b = a/6; i16test(a,b,6);
b = a/7; i16test(a,b,7);
b = a/8; i16test(a,b,8);
b = a/10; i16test(a,b,10);
b = a/16; i16test(a,b,16);
b = a/20; i16test(a,b,20);
b = a/32; i16test(a,b,32);
b = a/60; i16test(a,b,60);
b = a/64; i16test(a,b,64);
b = a/128; i16test(a,b,128);
b = a/256; i16test(a,b,256);
b = a/16384; i16test(a,b,16384);
b = a/-1; i16test(a,b,-1);
b = a/-2; i16test(a,b,-2);
b = a/-3; i16test(a,b,-3);
b = a/-4; i16test(a,b,-4);
b = a/-5; i16test(a,b,-5);
b = a/-6; i16test(a,b,-6);
b = a/-7; i16test(a,b,-7);
b = a/-8; i16test(a,b,-8);
b = a/-10; i16test(a,b,-10);
b = a/-16; i16test(a,b,-16);
b = a/-20; i16test(a,b,-20);
b = a/-32; i16test(a,b,-32);
b = a/-60; i16test(a,b,-60);
b = a/-64; i16test(a,b,-64);
b = a/-128; i16test(a,b,-128);
b = a/-256; i16test(a,b,-256);
b = a/-16384; i16test(a,b,-16384);
}
}
func
test(a,b,c int64)
u16rand() uint16
{
a := uint16(rand.Uint32());
a >>= uint(rand.Intn(16));
return a;
}
func
u16test(a,b,c uint16)
{
d := a/c;
if d != b {
panicln(a, b, c, d);
panicln("u16", a, b, c, d);
}
}
func
u16run()
{
var a, b uint16;
for i:=0; i<Count; i++ {
a = u16rand();
b = a/1; u16test(a,b,1);
b = a/2; u16test(a,b,2);
b = a/3; u16test(a,b,3);
b = a/4; u16test(a,b,4);
b = a/5; u16test(a,b,5);
b = a/6; u16test(a,b,6);
b = a/7; u16test(a,b,7);
b = a/8; u16test(a,b,8);
b = a/10; u16test(a,b,10);
b = a/16; u16test(a,b,16);
b = a/20; u16test(a,b,20);
b = a/32; u16test(a,b,32);
b = a/60; u16test(a,b,60);
b = a/64; u16test(a,b,64);
b = a/128; u16test(a,b,128);
b = a/256; u16test(a,b,256);
b = a/16384; u16test(a,b,16384);
}
}
func xtest()
func
main()
{
xtest();
i64run();
u64run();
i32run();
u32run();
i16run();
u16run();
}
func
xtest()
{
}
test/ken/modconst.go 0 → 100644
View file @ 812f06b3
// $G $D/$F.go && $L $F.$A && ./$A.out
// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package main
import "rand"
const Count = 1e6
func
i64rand() int64
{
for {
a := int64(rand.Uint32());
a = (a<<32) | int64(rand.Uint32());
a >>= uint(rand.Intn(64));
if -a != a {
return a;
}
}
return 0; // impossible
}
func
i64test(a,b,c int64)
{
d := a%c;
if d != b {
panicln("i64", a, b, c, d);
}
}
func
i64run()
{
var a, b int64;
for i:=0; i<Count; i++ {
a = i64rand();
b = a%1; i64test(a,b,1);
b = a%2; i64test(a,b,2);
b = a%3; i64test(a,b,3);
b = a%4; i64test(a,b,4);
b = a%5; i64test(a,b,5);
b = a%6; i64test(a,b,6);
b = a%7; i64test(a,b,7);
b = a%8; i64test(a,b,8);
b = a%10; i64test(a,b,10);
b = a%16; i64test(a,b,16);
b = a%20; i64test(a,b,20);
b = a%32; i64test(a,b,32);
b = a%60; i64test(a,b,60);
b = a%64; i64test(a,b,64);
b = a%128; i64test(a,b,128);
b = a%256; i64test(a,b,256);
b = a%16384; i64test(a,b,16384);
b = a%-1; i64test(a,b,-1);
b = a%-2; i64test(a,b,-2);
b = a%-3; i64test(a,b,-3);
b = a%-4; i64test(a,b,-4);
b = a%-5; i64test(a,b,-5);
b = a%-6; i64test(a,b,-6);
b = a%-7; i64test(a,b,-7);
b = a%-8; i64test(a,b,-8);
b = a%-10; i64test(a,b,-10);
b = a%-16; i64test(a,b,-16);
b = a%-20; i64test(a,b,-20);
b = a%-32; i64test(a,b,-32);
b = a%-60; i64test(a,b,-60);
b = a%-64; i64test(a,b,-64);
b = a%-128; i64test(a,b,-128);
b = a%-256; i64test(a,b,-256);
b = a%-16384; i64test(a,b,-16384);
}
}
func
u64rand() uint64
{
a := uint64(rand.Uint32());
a = (a<<32) | uint64(rand.Uint32());
a >>= uint(rand.Intn(64));
return a;
}
func
u64test(a,b,c uint64)
{
d := a%c;
if d != b {
panicln("u64", a, b, c, d);
}
}
func
u64run()
{
var a, b uint64;
for i:=0; i<Count; i++ {
a = u64rand();
b = a%1; u64test(a,b,1);
b = a%2; u64test(a,b,2);
b = a%3; u64test(a,b,3);
b = a%4; u64test(a,b,4);
b = a%5; u64test(a,b,5);
b = a%6; u64test(a,b,6);
b = a%7; u64test(a,b,7);
b = a%8; u64test(a,b,8);
b = a%10; u64test(a,b,10);
b = a%16; u64test(a,b,16);
b = a%20; u64test(a,b,20);
b = a%32; u64test(a,b,32);
b = a%60; u64test(a,b,60);
b = a%64; u64test(a,b,64);
b = a%128; u64test(a,b,128);
b = a%256; u64test(a,b,256);
b = a%16384; u64test(a,b,16384);
}
}
func
i32rand() int32
{
for {
a := int32(rand.Uint32());
a >>= uint(rand.Intn(32));
if -a != a {
return a;
}
}
return 0; // impossible
}
func
i32test(a,b,c int32)
{
d := a%c;
if d != b {
panicln("i32", a, b, c, d);
}
}
func
i32run()
{
var a, b int32;
for i:=0; i<Count; i++ {
a = i32rand();
b = a%1; i32test(a,b,1);
b = a%2; i32test(a,b,2);
b = a%3; i32test(a,b,3);
b = a%4; i32test(a,b,4);
b = a%5; i32test(a,b,5);
b = a%6; i32test(a,b,6);
b = a%7; i32test(a,b,7);
b = a%8; i32test(a,b,8);
b = a%10; i32test(a,b,10);
b = a%16; i32test(a,b,16);
b = a%20; i32test(a,b,20);
b = a%32; i32test(a,b,32);
b = a%60; i32test(a,b,60);
b = a%64; i32test(a,b,64);
b = a%128; i32test(a,b,128);
b = a%256; i32test(a,b,256);
b = a%16384; i32test(a,b,16384);
b = a%-1; i32test(a,b,-1);
b = a%-2; i32test(a,b,-2);
b = a%-3; i32test(a,b,-3);
b = a%-4; i32test(a,b,-4);
b = a%-5; i32test(a,b,-5);
b = a%-6; i32test(a,b,-6);
b = a%-7; i32test(a,b,-7);
b = a%-8; i32test(a,b,-8);
b = a%-10; i32test(a,b,-10);
b = a%-16; i32test(a,b,-16);
b = a%-20; i32test(a,b,-20);
b = a%-32; i32test(a,b,-32);
b = a%-60; i32test(a,b,-60);
b = a%-64; i32test(a,b,-64);
b = a%-128; i32test(a,b,-128);
b = a%-256; i32test(a,b,-256);
}
}
func
u32rand() uint32
{
a := uint32(rand.Uint32());
a >>= uint(rand.Intn(32));
return a;
}
func
u32test(a,b,c uint32)
{
d := a%c;
if d != b {
panicln("u32", a, b, c, d);
}
}
func
u32run()
{
var a, b uint32;
for i:=0; i<Count; i++ {
a = u32rand();
b = a%1; u32test(a,b,1);
b = a%2; u32test(a,b,2);
b = a%3; u32test(a,b,3);
b = a%4; u32test(a,b,4);
b = a%5; u32test(a,b,5);
b = a%6; u32test(a,b,6);
b = a%7; u32test(a,b,7);
b = a%8; u32test(a,b,8);
b = a%10; u32test(a,b,10);
b = a%16; u32test(a,b,16);
b = a%20; u32test(a,b,20);
b = a%32; u32test(a,b,32);
b = a%60; u32test(a,b,60);
b = a%64; u32test(a,b,64);
b = a%128; u32test(a,b,128);
b = a%256; u32test(a,b,256);
b = a%16384; u32test(a,b,16384);
}
}
func
i16rand() int16
{
for {
a := int16(rand.Uint32());
a >>= uint(rand.Intn(16));
if -a != a {
return a;
}
}
return 0; // impossible
}
func
i16test(a,b,c int16)
{
d := a%c;
if d != b {
panicln("i16", a, b, c, d);
}
}
func
i16run()
{
var a, b int16;
for i:=0; i<Count; i++ {
a = i16rand();
b = a%1; i16test(a,b,1);
b = a%2; i16test(a,b,2);
b = a%3; i16test(a,b,3);
b = a%4; i16test(a,b,4);
b = a%5; i16test(a,b,5);
b = a%6; i16test(a,b,6);
b = a%7; i16test(a,b,7);
b = a%8; i16test(a,b,8);
b = a%10; i16test(a,b,10);
b = a%16; i16test(a,b,16);
b = a%20; i16test(a,b,20);
b = a%32; i16test(a,b,32);
b = a%60; i16test(a,b,60);
b = a%64; i16test(a,b,64);
b = a%128; i16test(a,b,128);
b = a%256; i16test(a,b,256);
b = a%16384; i16test(a,b,16384);
b = a%-1; i16test(a,b,-1);
b = a%-2; i16test(a,b,-2);
b = a%-3; i16test(a,b,-3);
b = a%-4; i16test(a,b,-4);
b = a%-5; i16test(a,b,-5);
b = a%-6; i16test(a,b,-6);
b = a%-7; i16test(a,b,-7);
b = a%-8; i16test(a,b,-8);
b = a%-10; i16test(a,b,-10);
b = a%-16; i16test(a,b,-16);
b = a%-20; i16test(a,b,-20);
b = a%-32; i16test(a,b,-32);
b = a%-60; i16test(a,b,-60);
b = a%-64; i16test(a,b,-64);
b = a%-128; i16test(a,b,-128);
b = a%-256; i16test(a,b,-256);
b = a%-16384; i16test(a,b,-16384);
}
}
func
u16rand() uint16
{
a := uint16(rand.Uint32());
a >>= uint(rand.Intn(16));
return a;
}
func
u16test(a,b,c uint16)
{
d := a%c;
if d != b {
panicln("u16", a, b, c, d);
}
}
func
u16run()
{
var a, b uint16;
for i:=0; i<Count; i++ {
a = u16rand();
b = a%1; u16test(a,b,1);
b = a%2; u16test(a,b,2);
b = a%3; u16test(a,b,3);
b = a%4; u16test(a,b,4);
b = a%5; u16test(a,b,5);
b = a%6; u16test(a,b,6);
b = a%7; u16test(a,b,7);
b = a%8; u16test(a,b,8);
b = a%10; u16test(a,b,10);
b = a%16; u16test(a,b,16);
b = a%20; u16test(a,b,20);
b = a%32; u16test(a,b,32);
b = a%60; u16test(a,b,60);
b = a%64; u16test(a,b,64);
b = a%128; u16test(a,b,128);
b = a%256; u16test(a,b,256);
b = a%16384; u16test(a,b,16384);
}
}
func xtest()
func
main()
{
xtest();
i64run();
u64run();
i32run();
u32run();
i16run();
u16run();
}
func
xtest()
{
}
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