Revision: 25164
Author: [email protected]
Date: Wed Nov 5 15:19:30 2014 UTC
Log: Revert "[turbofan] Compute tighter ranges for modulus in Typer."
This reverts commit 482586747ca6bc0c94cc23f916fd190931d3a836.
[email protected]
BUG=
Review URL: https://codereview.chromium.org/702893002
https://code.google.com/p/v8/source/detail?r=25164
Modified:
/branches/bleeding_edge/src/compiler/typer.cc
/branches/bleeding_edge/test/cctest/compiler/test-typer.cc
=======================================
--- /branches/bleeding_edge/src/compiler/typer.cc Wed Nov 5 14:56:46 2014
UTC
+++ /branches/bleeding_edge/src/compiler/typer.cc Wed Nov 5 15:19:30 2014
UTC
@@ -232,7 +232,6 @@
static Type* JSSubtractRanger(Type::RangeType*, Type::RangeType*,
Typer*);
static Type* JSMultiplyRanger(Type::RangeType*, Type::RangeType*,
Typer*);
static Type* JSDivideRanger(Type::RangeType*, Type::RangeType*, Typer*);
- static Type* JSModulusRanger(Type::RangeType*, Type::RangeType*, Typer*);
static Type* JSCompareTyper(Type*, Type*, Typer*);
@@ -983,59 +982,19 @@
(rhs->Min() == -V8_INFINITY || rhs->Max() == +V8_INFINITY));
return maybe_nan ? Type::Number() : Type::OrderedNumber();
}
-
-
-Type* Typer::Visitor::JSModulusRanger(Type::RangeType* lhs,
- Type::RangeType* rhs, Typer* t) {
- double lmin = lhs->Min()->Number();
- double lmax = lhs->Max()->Number();
- double rmin = rhs->Min()->Number();
- double rmax = rhs->Max()->Number();
-
- double labs = std::max(std::abs(lmin), std::abs(lmax));
- double rabs = std::max(std::abs(rmin), std::abs(rmax)) - 1;
- double abs = std::min(labs, rabs);
- bool maybe_minus_zero = false;
- double omin = 0;
- double omax = 0;
- if (lmin >= 0) { // {lhs} positive.
- omin = 0;
- omax = abs;
- } else if (lmax <= 0) { // {lhs} negative.
- omin = 0 - abs;
- omax = 0;
- maybe_minus_zero = lmin <= omin;
- } else {
- omin = 0 - abs;
- omax = abs;
- maybe_minus_zero = lmin <= omin;
- }
-
- Factory* f = t->isolate()->factory();
- Type* result = Type::Range(f->NewNumber(omin), f->NewNumber(omax),
t->zone());
- if (maybe_minus_zero)
- result = Type::Union(result, Type::MinusZero(), t->zone());
- return result;
-}
Type* Typer::Visitor::JSModulusTyper(Type* lhs, Type* rhs, Typer* t) {
lhs = ToNumber(lhs, t);
rhs = ToNumber(rhs, t);
if (lhs->Is(Type::NaN()) || rhs->Is(Type::NaN())) return Type::NaN();
-
- if (lhs->Maybe(Type::NaN()) || rhs->Maybe(t->zeroish) ||
- lhs->Min() == -V8_INFINITY || lhs->Max() == +V8_INFINITY) {
- // Result maybe NaN.
- return Type::Number();
- }
-
- lhs = Rangify(lhs, t);
- rhs = Rangify(rhs, t);
- if (lhs->IsRange() && rhs->IsRange()) {
- return JSModulusRanger(lhs->AsRange(), rhs->AsRange(), t);
- }
- return Type::OrderedNumber();
+ // Division is tricky, so all we do is try ruling out nan.
+ // TODO(neis): try ruling out -0 as well?
+ bool maybe_nan =
+ lhs->Maybe(Type::NaN()) || rhs->Maybe(t->zeroish) ||
+ ((lhs->Min() == -V8_INFINITY || lhs->Max() == +V8_INFINITY) &&
+ (rhs->Min() == -V8_INFINITY || rhs->Max() == +V8_INFINITY));
+ return maybe_nan ? Type::Number() : Type::OrderedNumber();
}
=======================================
--- /branches/bleeding_edge/test/cctest/compiler/test-typer.cc Wed Nov 5
14:56:46 2014 UTC
+++ /branches/bleeding_edge/test/cctest/compiler/test-typer.cc Wed Nov 5
15:19:30 2014 UTC
@@ -4,7 +4,6 @@
#include <functional>
-#include "src/codegen.h"
#include "src/compiler/node-properties-inl.h"
#include "src/compiler/typer.h"
#include "test/cctest/cctest.h"
@@ -215,12 +214,6 @@
TyperTester t;
t.TestBinaryArithOp(t.javascript_.Divide(), std::divides<double>());
}
-
-
-TEST(TypeJSModulus) {
- TyperTester t;
- t.TestBinaryArithOp(t.javascript_.Modulus(), modulo);
-}
TEST(TypeJSBitwiseOr) {
--
--
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