mirror of
https://github.com/Gericom/teak-llvm.git
synced 2025-06-23 13:35:42 -04:00
cdd48b8a6b
This adds code to protect WebAssembly's `trunc_s` family of opcodes from values outside their domain. Even though such conversions have full undefined behavior in C/C++, LLVM IR's `fptosi` and `fptoui` do not, and only return undef. This also implements the proposed non-trapping float-to-int conversion feature and uses that instead when available. llvm-svn: 319128
57 lines
2.0 KiB
C++
57 lines
2.0 KiB
C++
//===-- WebAssemblySubtarget.cpp - WebAssembly Subtarget Information ------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
///
|
|
/// \file
|
|
/// \brief This file implements the WebAssembly-specific subclass of
|
|
/// TargetSubtarget.
|
|
///
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "WebAssemblySubtarget.h"
|
|
#include "MCTargetDesc/WebAssemblyMCTargetDesc.h"
|
|
#include "WebAssemblyInstrInfo.h"
|
|
#include "llvm/Support/TargetRegistry.h"
|
|
using namespace llvm;
|
|
|
|
#define DEBUG_TYPE "wasm-subtarget"
|
|
|
|
#define GET_SUBTARGETINFO_CTOR
|
|
#define GET_SUBTARGETINFO_TARGET_DESC
|
|
#include "WebAssemblyGenSubtargetInfo.inc"
|
|
|
|
WebAssemblySubtarget &
|
|
WebAssemblySubtarget::initializeSubtargetDependencies(StringRef FS) {
|
|
// Determine default and user-specified characteristics
|
|
|
|
if (CPUString.empty())
|
|
CPUString = "generic";
|
|
|
|
ParseSubtargetFeatures(CPUString, FS);
|
|
return *this;
|
|
}
|
|
|
|
WebAssemblySubtarget::WebAssemblySubtarget(const Triple &TT,
|
|
const std::string &CPU,
|
|
const std::string &FS,
|
|
const TargetMachine &TM)
|
|
: WebAssemblyGenSubtargetInfo(TT, CPU, FS), HasSIMD128(false),
|
|
HasAtomics(false), HasNontrappingFPToInt(false), CPUString(CPU),
|
|
TargetTriple(TT), FrameLowering(),
|
|
InstrInfo(initializeSubtargetDependencies(FS)), TSInfo(),
|
|
TLInfo(TM, *this) {}
|
|
|
|
bool WebAssemblySubtarget::enableMachineScheduler() const {
|
|
// Disable the MachineScheduler for now. Even with ShouldTrackPressure set and
|
|
// enableMachineSchedDefaultSched overridden, it appears to have an overall
|
|
// negative effect for the kinds of register optimizations we're doing.
|
|
return false;
|
|
}
|
|
|
|
bool WebAssemblySubtarget::useAA() const { return true; }
|