1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
|
//===-- ldctraits.cpp -----------------------------------------------------===//
//
// LDC – the LLVM D compiler
//
// This file is distributed under the BSD-style LDC license. See the LICENSE
// file for details.
//
//===----------------------------------------------------------------------===//
#include "gen/irstate.h"
#include "gen/ldctraits.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/MC/MCSubtargetInfo.h"
Dstring traitsGetTargetCPU() {
auto cpu = gTargetMachine->getTargetCPU();
return {cpu.size(), cpu.data()};
}
bool traitsTargetHasFeature(Dstring feature) {
auto feat = llvm::StringRef(feature.ptr, feature.length);
// This is a work-around to a missing interface in LLVM to query whether a
// feature is set.
// Copy MCSubtargetInfo so we can modify it.
llvm::MCSubtargetInfo mcinfo = *gTargetMachine->getMCSubtargetInfo();
auto savedFeatbits = mcinfo.getFeatureBits();
// Nothing will change if the feature string is not recognized or if the
// feature is disabled.
{
auto newFeatbits = mcinfo.ApplyFeatureFlag(("-" + feat).str());
if (savedFeatbits == newFeatbits) {
return false;
}
mcinfo.setFeatureBits(savedFeatbits);
}
{
// Now that unrecognized feature strings are excluded,
// nothing will change iff the feature and its implied features are enabled.
auto newFeatbits = mcinfo.ApplyFeatureFlag(("+" + feat).str());
return savedFeatbits == newFeatbits;
}
}
|
