add/sub instructions.

llvm-svn: 151415

reserving a physical register ($gp or $28) for that purpose.

This will completely eliminate loads that restore the value of $gp after every
function call, if the register allocator assigns a callee-saved register, or
eliminate unnecessary loads if it assigns a temporary register. 

example:

.cpload $25       // set $gp.
...
.cprestore 16     // store $gp to stack slot 16($sp).
...
jalr $25          // function call. clobbers $gp.
lw $gp, 16($sp)   // not emitted if callee-saved reg is chosen.
...
lw $2, 4($gp)
...
jalr $25          // function call.
lw $gp, 16($sp)   // not emitted if $gp is not live after this instruction.
...

llvm-svn: 151402

llvm-svn: 151341

llvm-svn: 151340

llvm-svn: 151337

llvm-svn: 151332

Make all pointers to TargetRegisterClass const since they are all pointers to static data that should not be modified.

llvm-svn: 151134

llvm-svn: 151107

llvm-svn: 150918

llvm-svn: 150805

instructions to be emitted.

llvm-svn: 150782

llvm-svn: 150775

llvm-svn: 150739

llvm-svn: 150706

llvm-svn: 149961

llvm-svn: 149814

Passes prior to instructon selection are now split into separate configurable stages.
Header dependencies are simplified.
The bulk of this diff is simply removal of the silly DisableVerify flags.

Sorry for the target header churn. Attempting to stabilize them.

llvm-svn: 149754

Allows command line overrides to be centralized in LLVMTargetMachine.cpp.
LLVMTargetMachine can intercept common passes and give precedence to command line overrides.
Allows adding "internal" target configuration options without touching TargetOptions.
Encapsulates the PassManager.
Provides a good point to initialize all CodeGen passes so that Pass ID's can be used in APIs.
Allows modifying the target configuration hooks without rebuilding the world.

llvm-svn: 149672

needed to emit a 64-bit gp-relative relocation entry. Make changes necessary
for emitting jump tables which have entries with directive .gpdword. This patch
does not implement the parts needed for direct object emission or JIT.

llvm-svn: 149668

 

llvm-svn: 149585

selector registers.
 

llvm-svn: 149584

 

llvm-svn: 149583

Fixes PR11877

llvm-svn: 149180

 

llvm-svn: 148918

- Use MipsAnalyzeImmediate to expand immediates that do not fit in 16-bit.
- Change the types of variables so that they are sufficiently large to handle
  64-bit pointers.
- Emit instructions to set register $28 in a function prologue after
  instructions which store callee-saved registers have been emitted. 
 

llvm-svn: 148917

expand offsets that do not fit in the 16-bit immediate field of load and store
instructions. Also change the types of variables so that they are sufficiently
large to handle 64-bit pointers.

llvm-svn: 148916

inttypes.h is not supplied in msvc.

llvm-svn: 148912

llvm-svn: 148909

Add a test case to show fewer instructions are needed to load an immediate
with the new way of loading immediates.

llvm-svn: 148908

load an immediate. 

llvm-svn: 148900

which is what N32/64 does.

llvm-svn: 148875

llvm-svn: 148871

llvm-svn: 148869

llvm-svn: 148862

Widen the instruction encoder that TblGen emits to a 64 bits, which should accomodate every target I can think of offhand.

llvm-svn: 148833

llvm-svn: 148578

This is similar to implicit register operands.  MC doesn't understand
register liveness and call clobbers.

llvm-svn: 148437

llvm-svn: 148400

When set, this bit indicates that a register is completely defined by
the value of its sub-registers.

Use the CoveredBySubRegs property to infer which super-registers are
call-preserved given a list of callee-saved registers.  For example, the
ARM registers D8-D15 are callee-saved.  This now automatically implies
that Q4-Q7 are call-preserved.

Conversely, Win64 callees save XMM6-XMM15, but the corresponding
YMM6-YMM15 registers are not call-preserved because they are not fully
defined by their sub-registers.

llvm-svn: 148363

Removing unused default switch cases in switches over enums that already account for all enumeration values explicitly.

(This time I believe I've checked all the -Wreturn-type warnings from GCC & added the couple of llvm_unreachables necessary to silence them. If I've missed any, I'll happily fix them as soon as I know about them)

llvm-svn: 148262