llvm-svn: 120696

For most intrinsics, there is no need to allocate a temporary to hold the
result value; just return it directly.

llvm-svn: 120695

This does not work so well with the -fno-lax-vector-conversions option for
testing the arm_neon.h header but that is a really useful test, so I split
this out to a separate Sema test to check for the warning.

llvm-svn: 120694

Since we're casting them for the calls to the builtins, we need this to
make sure their types get checked in the same way they would if the intrinsics
were implemented as inline functions.

llvm-svn: 120693

when an initializer is variable (I handled the constant case in a previous
patch).  This has three pieces:

1. Enhance AggValueSlot to have a 'isZeroed' bit to tell CGExprAgg that
   the memory being stored into has previously been memset to zero.
2. Teach CGExprAgg to not emit stores of zero to isZeroed memory.
3. Teach CodeGenFunction::EmitAggExpr to scan initializers to determine
   whether they are profitable to emit a memset + inividual stores vs
   stores for everything.

The heuristic used is that a global has to be more than 16 bytes and
has to be 3/4 zero to be candidate for this xform.  The two testcases
are illustrative of the scenarios this catches.  We now codegen test9 into:

 call void @llvm.memset.p0i8.i64(i8* %0, i8 0, i64 400, i32 4, i1 false)
 %.array = getelementptr inbounds [100 x i32]* %Arr, i32 0, i32 0
 %tmp = load i32* %X.addr, align 4
 store i32 %tmp, i32* %.array

and test10 into:

  call void @llvm.memset.p0i8.i64(i8* %0, i8 0, i64 392, i32 8, i1 false)
  %tmp = getelementptr inbounds %struct.b* %S, i32 0, i32 0
  %tmp1 = getelementptr inbounds %struct.a* %tmp, i32 0, i32 0
  %tmp2 = load i32* %X.addr, align 4
  store i32 %tmp2, i32* %tmp1, align 4
  %tmp5 = getelementptr inbounds %struct.b* %S, i32 0, i32 3
  %tmp10 = getelementptr inbounds %struct.a* %tmp5, i32 0, i32 4
  %tmp11 = load i32* %X.addr, align 4
  store i32 %tmp11, i32* %tmp10, align 4

Previously we produced 99 stores of zero for test9 and also tons for test10.
This xforms should substantially speed up -O0 builds when it kicks in as well
as reducing code size and optimizer heartburn on insane cases.  This resolves
PR279.

llvm-svn: 120692

llvm-svn: 120691

llvm-svn: 120690

llvm-svn: 120689

llvm-svn: 120688

contain only data. Handle them specially instead of using AddSectionToTheEnd.
This moves a hack from the generic assembler to the elf writer. It is also
a bit faster and should make other improvements easier.

llvm-svn: 120683

rdar://8560647

llvm-svn: 120650

This is in preparation for adding assignments to temporaries to ensure
that the proper type checking is done.

llvm-svn: 120649

llvm-svn: 120648

llvm-svn: 120647

llvm-svn: 120646

a global is larger than 32 bytes and has fewer than 6 non-zero values in the
initializer.  Previously we'd turn something like this:

char test8(int X) {
  char str[10000] = "abc";

into a 10K global variable which we then memcpy'd from.  Now we generate:

  %str = alloca [10000 x i8], align 16
  %tmp = getelementptr inbounds [10000 x i8]* %str, i64 0, i64 0
  call void @llvm.memset.p0i8.i64(i8* %tmp, i8 0, i64 10000, i32 16, i1 false)
  store i8 97, i8* %tmp, align 16
  %0 = getelementptr [10000 x i8]* %str, i64 0, i64 1
  store i8 98, i8* %0, align 1
  %1 = getelementptr [10000 x i8]* %str, i64 0, i64 2
  store i8 99, i8* %1, align 2

Which is much smaller in space and also likely faster.

This is part of PR279

llvm-svn: 120645

llvm-svn: 120644

into the latter.

llvm-svn: 120643

llvm-svn: 120642

llvm-svn: 120641

The bitwise operations are always done with unsigned values, but the result may
be signed.

llvm-svn: 120640

llvm-svn: 120639

We should not rely on lax-vector-conversions for these intrinsics to work.

llvm-svn: 120638

llvm-svn: 120637

Scan the MachineFunction for DBG_VALUE instructions, and replace them with a
data structure similar to LiveIntervals. The live range of a DBG_VALUE is
determined by propagating it down the dominator tree until a new DBG_VALUE is
found. When a DBG_VALUE lives in a register, its live range is confined to the
live range of the register's value.

LiveDebugVariables runs before coalescing, so DBG_VALUEs are not artificially
extended when registers are joined.

The missing half will recreate DBG_VALUE instructions from the intervals when
register allocation is complete.

The pass is disabled by default. It can be enabled with the temporary command
line option -live-debug-variables.

llvm-svn: 120636

pool entries (LEApcrel pseudo). Ongoing saga of rdar://8542291.

llvm-svn: 120635

Make sure the -Wvector-conversions does not cause unnecessary warnings when
using Neon intrinsics with the correct types.

llvm-svn: 120634

Check for compatible gcc, Altivec and Neon vectors before handling the
lax-vector-conversions case.  Otherwise there is no way to avoid the
warnings from -Wvector-conversions.

llvm-svn: 120633

llvm-svn: 120632

llvm-svn: 120631

llvm-svn: 120630

to be available in debug vs. release builds.

llvm-svn: 120629

llvm-svn: 120628

definition of an Objective-C class. Unlike with C/C++ classes, we
don't have a well-defined point in Sema where Objective-C classes are
checked for completeness, nor do we need to involve Sema when
completing a class. Therefore, we take the appropriate of having the
external AST source mark a particular Objective-C class as having an
external declaration; when using one of the accessors of an
Objective-C class that has an external declaration, we request that
the external AST source fill in the Objective-C class definition.

llvm-svn: 120627

    Don't overwhelm the expression mechanism.  Previously, there was no delay
    between successive invocations of 'expression' command.  The test suite
    run has experienced 'Resume timed out' or similar error messages.  Now we
    currently add a sleep of 1.0 second before issuing the next 'expression'
    command.

llvm-svn: 120626

cases when specifying '-w' to the test driver, by using an environment variable
LLDB_TIME_WAIT_BETWEEN_TEST_CASES.

llvm-svn: 120625

llvm-svn: 120624

before iterating on it.

llvm-svn: 120623

llvm-svn: 120622

llvm-svn: 120621