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Unified Diff: src/x64/codegen-x64.cc

Issue 9572009: Ensure consistent result of transcendental functions. (Closed) Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge
Patch Set: Fix compile errors for arm and mips. Created 8 years, 10 months ago
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Index: src/x64/codegen-x64.cc
diff --git a/src/x64/codegen-x64.cc b/src/x64/codegen-x64.cc
index 8947f70055f64745333a35e1b840480e1c0a1796..2584889f087d56ff0fffd6f6521b47a7cf315326 100644
--- a/src/x64/codegen-x64.cc
+++ b/src/x64/codegen-x64.cc
@@ -54,6 +54,52 @@ void StubRuntimeCallHelper::AfterCall(MacroAssembler* masm) const {
#define __ masm.
+
+TranscendentalFunction CreateTranscendentalFunction(
+ TranscendentalCache::Type type) {
+ size_t actual_size;
+ // Allocate buffer in executable space.
+ byte* buffer = static_cast<byte*>(OS::Allocate(1 * KB,
+ &actual_size,
+ true));
+ if (buffer == NULL) {
+ // Fallback to library function if function cannot be created.
+ switch (type) {
+ case TranscendentalCache::SIN: return &sin;
+ case TranscendentalCache::COS: return &cos;
+ case TranscendentalCache::TAN: return &tan;
+ case TranscendentalCache::LOG: return &log;
+ default: UNIMPLEMENTED();
+ }
+ }
+
+ MacroAssembler masm(NULL, buffer, static_cast<int>(actual_size));
+ // xmm0: raw double input.
+ // Move double input into registers.
+ __ push(rbx);
+ __ push(rdi);
+ __ movq(rbx, xmm0);
+ __ push(rbx);
+ __ fld_d(Operand(rsp, 0));
+ TranscendentalCacheStub::GenerateOperation(&masm, type);
+ // The return value is expected to be in xmm0.
+ __ fstp_d(Operand(rsp, 0));
+ __ pop(rbx);
+ __ movq(xmm0, rbx);
+ __ pop(rdi);
+ __ pop(rbx);
+ __ Ret();
+
+ CodeDesc desc;
+ masm.GetCode(&desc);
+ ASSERT(desc.reloc_size == 0);
+
+ CPU::FlushICache(buffer, actual_size);
+ OS::ProtectCode(buffer, actual_size);
+ return FUNCTION_CAST<TranscendentalFunction>(buffer);
+}
+
+
#ifdef _WIN64
typedef double (*ModuloFunction)(double, double);
// Define custom fmod implementation.
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