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ARM MachO: sort out isTargetDarwin/isTargetIOS/... checks.

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The ARM backend has been using most of the MachO related subtarget
checks almost interchangeably, and since the only target it's had to
run on has been IOS (which is all three of MachO, Darwin and IOS) it's
worked out OK so far.

But we'd like to support embedded targets under the "*-*-none-macho"
triple, which means everything starts falling apart and inconsistent
behaviours emerge.

This patch should pick a reasonably sensible set of behaviours for the
new triple (and any others that come along, with luck). Some choices
were debatable (notably FP == r7 or r11), but we can revisit those
later when deficiencies become apparent.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@198617 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Tim Northover
2014-01-06 14:28:05 +00:00
parent f1c1a7ce44
commit 0aba46f4cd
27 changed files with 201 additions and 94 deletions
Download Patch File Download Diff File Expand all files Collapse all files
lib/Target/ARM/ARMFastISel.cpp
+5 -5
View File
@@ -675,18 +675,18 @@ unsigned ARMFastISel::ARMMaterializeGV(const GlobalValue *GV, MVT VT) {
(const TargetRegisterClass*)&ARM::GPRRegClass;
unsigned DestReg = createResultReg(RC);
// FastISel TLS support on non-Darwin is broken, punt to SelectionDAG.
// FastISel TLS support on non-MachO is broken, punt to SelectionDAG.
const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV);
bool IsThreadLocal = GVar && GVar->isThreadLocal();
if (!Subtarget->isTargetDarwin() && IsThreadLocal) return 0;
if (!Subtarget->isTargetMachO() && IsThreadLocal) return 0;
// Use movw+movt when possible, it avoids constant pool entries.
// Non-darwin targets only support static movt relocations in FastISel.
if (Subtarget->useMovt() &&
(Subtarget->isTargetDarwin() || RelocM == Reloc::Static)) {
(Subtarget->isTargetMachO() || RelocM == Reloc::Static)) {
unsigned Opc;
unsigned char TF = 0;
if (Subtarget->isTargetDarwin())
if (Subtarget->isTargetMachO())
TF = ARMII::MO_NONLAZY;
switch (RelocM) {
@@ -3144,7 +3144,7 @@ namespace llvm {
const ARMSubtarget *Subtarget = &TM.getSubtarget<ARMSubtarget>();
// Thumb2 support on iOS; ARM support on iOS, Linux and NaCl.
bool UseFastISel = false;
UseFastISel |= Subtarget->isTargetIOS() && !Subtarget->isThumb1Only();
UseFastISel |= Subtarget->isTargetMachO() && !Subtarget->isThumb1Only();
UseFastISel |= Subtarget->isTargetLinux() && !Subtarget->isThumb();
UseFastISel |= Subtarget->isTargetNaCl() && !Subtarget->isThumb();