Unity-Technologies
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emscripten
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fix registerize semantics to treat each arm of ifs and switches separately

This commit is contained in:
Alon Zakai 2013-05-25 18:52:57 -07:00
Родитель 7011aa3831
Коммит d5299a3bbf
3 изменённых файлов: 186 добавлений и 11 удалений
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61
tools/js-optimizer.js
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@ -1596,7 +1596,15 @@ function registerize(ast) {
var varLevels = {};
var possibles = {};
var unoptimizables = {};
traverse(fun, function(node, type) {
function purgeLevel() {
// Invalidate all dominating on this level, further users make it unoptimizable
for (var name in levelDominations[level]) {
varLevels[name] = 0;
}
levelDominations[level] = null;
level--;
}
traverse(fun, function possibilifier(node, type) {
if (type == 'name') {
var name = node[1];
if (localVars[name]) {
@ -1617,16 +1625,49 @@ function registerize(ast) {
}
}
} else if (type in CONTROL_FLOW) {
// recurse children, in the context of a loop
switch(type) {
case 'while': case 'do': {
traverse(node[1], possibilifier);
level++;
traverse(node[2], possibilifier);
purgeLevel();
break;
}
}, function(node, type) {
if (type in CONTROL_FLOW) {
// Invalidate all dominating on this level, further users make it unoptimizable
for (var name in levelDominations[level]) {
varLevels[name] = 0;
case 'for': {
traverse(node[1], possibilifier);
for (var i = 2; i <= 4; i++) {
level++;
traverse(node[i], possibilifier);
purgeLevel();
}
levelDominations[level] = null;
level--;
break;
}
case 'if': {
traverse(node[1], possibilifier);
level++;
traverse(node[2], possibilifier);
purgeLevel();
if (node[3]) {
level++;
traverse(node[3], possibilifier);
purgeLevel();
}
break;
}
case 'switch': {
traverse(node[1], possibilifier);
var cases = node[2];
for (var i = 0; i < cases.length; i++) {
level++;
traverse(cases[i][1], possibilifier);
purgeLevel();
}
break;
}
default: throw dumpAst(node);
}
return null; // prevent recursion into children, which we already did
}
});
var optimizables = {};
@ -1635,6 +1676,10 @@ function registerize(ast) {
if (!unoptimizables[possible]) optimizables[possible] = 1;
}
}
//printErr('optimizables: ' + JSON.stringify(optimizables));
//printErr('unoptimizables: ' + JSON.stringify(unoptimizables));
// Go through the function's code, assigning 'registers'.
// The only tricky bit is to keep variables locked on a register through loops,
// since they can potentially be returned to. Optimizable variables lock onto

65
tools/test-js-optimizer-asm-regs-output.js
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@ -38,4 +38,69 @@ function switchey(d1, i2) {
return 20;
}
}
function switchey2() {
var i1 = 0, i2 = 0, i3 = 0, i4 = 0, i5 = 0, d6 = +0, d7 = +0, i8 = 0, i9 = 0;
i1 = STACKTOP;
STACKTOP = STACKTOP + 8 | 0;
i2 = 1;
while (1) switch (i2 | 0) {
case 1:
i3 = i1 | 0;
__ZN6RandomC1Ev(i3);
i4 = 0;
i5 = 0;
i2 = 2;
break;
case 2:
d6 = +__ZN6Random3getEf(8, +1);
d7 = +__ZN6Random3getEf(i3, +1);
_printf(24, (tempInt = STACKTOP, STACKTOP = STACKTOP + 16 | 0, HEAPF64[CHECK_ALIGN_8(tempInt | 0) >> 3] = d6, HEAPF64[CHECK_ALIGN_8(tempInt + 8 | 0) >> 3] = d7, tempInt) | 0);
i8 = (d6 != d7 & 1) + i5 | 0;
i9 = i4 + 1 | 0;
if ((i9 | 0) < 100) {
i4 = i9;
i5 = i8;
i2 = 2;
break;
} else {
i2 = 3;
break;
}
case 3:
_printf(16, (tempInt = STACKTOP, STACKTOP = STACKTOP + 8 | 0, HEAP32[CHECK_ALIGN_4(tempInt | 0) >> 2] = i8, tempInt) | 0);
STACKTOP = i1;
return 0;
}
return 0;
}
function iffey() {
var i1 = 0, i2 = 0, i3 = 0, i4 = 0, i5 = 0, d6 = +0, d7 = +0, i8 = 0, i9 = 0;
i1 = STACKTOP;
STACKTOP = STACKTOP + 8 | 0;
i2 = 1;
while (1) {
if (i2 | 0) {
i3 = i1 | 0;
__ZN6RandomC1Ev(i3);
i4 = 0;
i5 = 0;
i2 = 2;
} else {
d6 = +__ZN6Random3getEf(8, +1);
d7 = +__ZN6Random3getEf(i3, +1);
_printf(24, (tempInt = STACKTOP, STACKTOP = STACKTOP + 16 | 0, HEAPF64[CHECK_ALIGN_8(tempInt | 0) >> 3] = d6, HEAPF64[CHECK_ALIGN_8(tempInt + 8 | 0) >> 3] = d7, tempInt) | 0);
i8 = (d6 != d7 & 1) + i5 | 0;
i9 = i4 + 1 | 0;
if ((i9 | 0) < 100) {
i4 = i9;
i5 = i8;
i2 = 2;
} else {
i2 = 3;
return 10;
}
}
}
return 0;
}

67
tools/test-js-optimizer-asm-regs.js
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@ -41,5 +41,70 @@ function switchey(x, y) {
return 20;
}
}
// EMSCRIPTEN_GENERATED_FUNCTIONS: ["asm", "_doit", "stackRestore", "switchey"]
function switchey2() {
var $rng2 = 0, $count_06 = 0, $i_05 = 0, $2 = +0, $3 = +0, $count_1 = 0, $9 = 0, label = 0, __stackBase__ = 0;
__stackBase__ = STACKTOP;
STACKTOP = STACKTOP + 8 | 0;
label = 1;
while (1) switch (label | 0) {
case 1:
$rng2 = __stackBase__ | 0;
__ZN6RandomC1Ev($rng2);
$i_05 = 0;
$count_06 = 0;
label = 2;
break;
case 2:
$2 = +__ZN6Random3getEf(8, +1);
$3 = +__ZN6Random3getEf($rng2, +1);
_printf(24, (tempInt = STACKTOP, STACKTOP = STACKTOP + 16 | 0, HEAPF64[CHECK_ALIGN_8(tempInt | 0) >> 3] = $2, HEAPF64[CHECK_ALIGN_8(tempInt + 8 | 0) >> 3] = $3, tempInt) | 0);
$count_1 = ($2 != $3 & 1) + $count_06 | 0;
$9 = $i_05 + 1 | 0;
if (($9 | 0) < 100) {
$i_05 = $9;
$count_06 = $count_1;
label = 2;
break;
} else {
label = 3;
break;
}
case 3:
_printf(16, (tempInt = STACKTOP, STACKTOP = STACKTOP + 8 | 0, HEAP32[CHECK_ALIGN_4(tempInt | 0) >> 2] = $count_1, tempInt) | 0);
STACKTOP = __stackBase__;
return 0;
}
return 0;
}
function iffey() {
var $rng2 = 0, $count_06 = 0, $i_05 = 0, $2 = +0, $3 = +0, $count_1 = 0, $9 = 0, label = 0, __stackBase__ = 0;
__stackBase__ = STACKTOP;
STACKTOP = STACKTOP + 8 | 0;
label = 1;
while (1) {
if (label | 0) {
$rng2 = __stackBase__ | 0;
__ZN6RandomC1Ev($rng2);
$i_05 = 0;
$count_06 = 0;
label = 2;
} else {
$2 = +__ZN6Random3getEf(8, +1);
$3 = +__ZN6Random3getEf($rng2, +1);
_printf(24, (tempInt = STACKTOP, STACKTOP = STACKTOP + 16 | 0, HEAPF64[CHECK_ALIGN_8(tempInt | 0) >> 3] = $2, HEAPF64[CHECK_ALIGN_8(tempInt + 8 | 0) >> 3] = $3, tempInt) | 0);
$count_1 = ($2 != $3 & 1) + $count_06 | 0;
$9 = $i_05 + 1 | 0;
if (($9 | 0) < 100) {
$i_05 = $9;
$count_06 = $count_1;
label = 2;
} else {
label = 3;
return 10;
}
}
}
return 0;
}
// EMSCRIPTEN_GENERATED_FUNCTIONS: ["asm", "_doit", "stackRestore", "switchey", "switchey2", "iffey"]