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Unified Diff: src/runtime.cc

Issue 178583006: Introduce intrinsics for double values in Javascript. (Closed) Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge
Patch Set: test Created 6 years, 10 months ago
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Index: src/runtime.cc
diff --git a/src/runtime.cc b/src/runtime.cc
index 27e55779e565307010a280b80e9a44756654342d..24dc60f0bc5b76cbe3963a20e5bff4f958739afc 100644
--- a/src/runtime.cc
+++ b/src/runtime.cc
@@ -7680,6 +7680,34 @@ RUNTIME_UNARY_MATH(log)
#undef RUNTIME_UNARY_MATH
+RUNTIME_FUNCTION(MaybeObject*, Runtime_DoubleHi) {
+ SealHandleScope shs(isolate);
+ ASSERT(args.length() == 1);
+ CONVERT_DOUBLE_ARG_CHECKED(x, 0);
+ return isolate->heap()->NumberFromDouble(
+ static_cast<int32_t>(double_to_uint64(x) >> 32));
+}
+
+
+RUNTIME_FUNCTION(MaybeObject*, Runtime_DoubleLo) {
+ SealHandleScope shs(isolate);
+ ASSERT(args.length() == 1);
+ CONVERT_DOUBLE_ARG_CHECKED(x, 0);
+ return isolate->heap()->NumberFromDouble(
+ static_cast<int32_t>(double_to_uint64(x) & 0xFFFFFFFFu));
+}
+
+
+RUNTIME_FUNCTION(MaybeObject*, Runtime_ConstructDouble) {
+ SealHandleScope shs(isolate);
+ ASSERT(args.length() == 2);
+ CONVERT_NUMBER_CHECKED(uint32_t, hi, Uint32, args[0]);
+ CONVERT_NUMBER_CHECKED(uint32_t, lo, Uint32, args[1]);
+ uint64_t result = (static_cast<uint64_t>(hi) << 32) | lo;
+ return isolate->heap()->AllocateHeapNumber(uint64_to_double(result));
+}
+
+
// Cube root approximation, refer to: http://metamerist.com/cbrt/cbrt.htm
// Using initial approximation adapted from Kahan's cbrt and 4 iterations
// of Newton's method.
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