Squash a warning from the Solaris assembler by aligning the stack
on a double-word boundary instead of a single-word boundary.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14177 91177308-0d34-0410-b5e6-96231b3b80d8

Allow special-casing of operand printing based on opcode.  Print
non-register, non-immed. arguments to SETHI and OR using %hi() and
%lo() respectively.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14176 91177308-0d34-0410-b5e6-96231b3b80d8

Support constant GEP expressions.
Support copying long constants to register pairs.
Support copying ConstantPointerNulls and ConstantPointerRefs to registers.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14175 91177308-0d34-0410-b5e6-96231b3b80d8

The correct prototype is `int atoi(CONST char*)'.  Unbroke AIX build.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14173 91177308-0d34-0410-b5e6-96231b3b80d8

Add file comment.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14172 91177308-0d34-0410-b5e6-96231b3b80d8

Quick hack to get this file compiling again on Mac OS X.  The right thing to do
is write an autoconf macro that checks whether __isnan or isnan actually works
**using the C++ compiler after #include <cmath>**, instead of doing it the easy
way with AC_CHECK_FUNCS().

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14171 91177308-0d34-0410-b5e6-96231b3b80d8

Make -print-machineinstrs even stronger. You get to see the final code after
peepholing, and make it work the same way in the JIT as in LLC.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14170 91177308-0d34-0410-b5e6-96231b3b80d8

Get rid of "might be uninitialized" warnings when compiling with GCC 3.3.2

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14169 91177308-0d34-0410-b5e6-96231b3b80d8

Add constant folding capabilities to the isunordered intrinsic.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14168 91177308-0d34-0410-b5e6-96231b3b80d8

Really add the docs this time :-)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14167 91177308-0d34-0410-b5e6-96231b3b80d8

Make assertions more consistent with the rest of the intrinsic
function verification and make it a requirement that both arguments to
llvm.isunordered are of the same type.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14165 91177308-0d34-0410-b5e6-96231b3b80d8

Add the isunordered intrinsic.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14159 91177308-0d34-0410-b5e6-96231b3b80d8

Reduce the number of columns in the alpha index to 4 so that it fits
on a 1280x1024 screen!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14158 91177308-0d34-0410-b5e6-96231b3b80d8

It is no longer 2001

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14157 91177308-0d34-0410-b5e6-96231b3b80d8

Don't trim @PrevDays (causing an error) if it isn't long enough.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14156 91177308-0d34-0410-b5e6-96231b3b80d8

Fix grammar: 's is for possessive only.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14155 91177308-0d34-0410-b5e6-96231b3b80d8

Implement tracking of bytecode instruction size and the number of long
instructions generated.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14154 91177308-0d34-0410-b5e6-96231b3b80d8

Add two options to the program:
-release causes ENABLE_OPTIMIZED=1 to be added to the make line so that
         the test runs against optimized code.
-pedantic causes the CompileOptimizeOpts variable to be overridden to
          add several additional warnings not picked up by -Wall. This
  should help catch additional programming faux pas. See the diff
  for the specific details.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14153 91177308-0d34-0410-b5e6-96231b3b80d8

Fix fallout from getOffsetOfLocalArea() being negated.  Debugging dumps were being
printed incorrectly, and we were reserving 8 extra bytes of stack space for functions
on X86.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14152 91177308-0d34-0410-b5e6-96231b3b80d8

llvm.isnan doesn't access memory

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14151 91177308-0d34-0410-b5e6-96231b3b80d8

Constant fold the isnan intrinsic

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14150 91177308-0d34-0410-b5e6-96231b3b80d8

Add tests for isnan

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14149 91177308-0d34-0410-b5e6-96231b3b80d8

By far, one of the most common uses of isnan is to make 'isunordered'
comparisons.  In an 'isunordered' predicate, which looks like this at
the LLVM level:

        %a = call bool %llvm.isnan(double %X)
        %b = call bool %llvm.isnan(double %Y)
        %COM = or bool %a, %b

We used to generate this code:

        fxch %ST(1)
        fucomip %ST(0), %ST(0)
        setp %AL
        fucomip %ST(0), %ST(0)
        setp %AH
        or %AL, %AH

With this patch, we generate this code:

        fucomip %ST(0), %ST(1)
        fstp %ST(0)
        setp %AL

Which should make alkis happy.  Tested as X86/compare_folding.llx:test1

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14148 91177308-0d34-0410-b5e6-96231b3b80d8

Test that the X86 backend is only emitting one fucom instruction
for each 'COM =' line.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14147 91177308-0d34-0410-b5e6-96231b3b80d8

Fix bug in previous checkin

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14146 91177308-0d34-0410-b5e6-96231b3b80d8

No really, these are dead now

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14145 91177308-0d34-0410-b5e6-96231b3b80d8

Now that compare instructions aren't lumped in with the other twoargfp instructions,
we can get rid of the FpUCOM/FpUCOMi pseudo instructions, which makes stuff simpler
and faster.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14144 91177308-0d34-0410-b5e6-96231b3b80d8

Introduce a new FP instruction type to separate the compare cases from the
twoarg cases.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14143 91177308-0d34-0410-b5e6-96231b3b80d8

Bug fixed, new feature

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14142 91177308-0d34-0410-b5e6-96231b3b80d8

Add direct support for the isnan intrinsic, implementing test/Regression/CodeGen/X86/isnan.llx
testcase

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14141 91177308-0d34-0410-b5e6-96231b3b80d8

Add support for the setp instructions

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14140 91177308-0d34-0410-b5e6-96231b3b80d8

Split compare instruction handling OUT of handleTwoArgFP into handleCompareFP.
This makes the code much simpler, and the two cases really do belong apart.
Once we do it, it's pretty obvious how flawed the logic was for A != A case,
so I fixed it (fixing PR369).

This also uses freeStackSlotAfter instead of inserting an fxchg then
popStackAfter'ing in the case where there is a dead result (unlikely, but
possible), producing better code.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14139 91177308-0d34-0410-b5e6-96231b3b80d8

Change tags rule to pipe output from find through etags command so that it
doesn't break on machines with limited command line lengths.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14138 91177308-0d34-0410-b5e6-96231b3b80d8

Revert an unneeded interface change to Instruction.h

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14137 91177308-0d34-0410-b5e6-96231b3b80d8

Testcase for PR369

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14136 91177308-0d34-0410-b5e6-96231b3b80d8

Check to make sure that isnan doesn't require calling a function

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14135 91177308-0d34-0410-b5e6-96231b3b80d8

Fix lowering to work correctly

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14134 91177308-0d34-0410-b5e6-96231b3b80d8

I misled Alkis: LLVM should have isnan, not isunordered.
  isunordered(X, Y) === isnan(X) | isnan(Y)

Remove isunordered, add isnan.

Modernize testcase

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14133 91177308-0d34-0410-b5e6-96231b3b80d8

I misled Alkis: LLVM should have isnan, not isunordered.
  isunordered(X, Y) === isnan(X) | isnan(Y)

Remove isunordered, add isnan.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14132 91177308-0d34-0410-b5e6-96231b3b80d8

Document the llvm.isnan intrinsic

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14131 91177308-0d34-0410-b5e6-96231b3b80d8

Bug fixed.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14130 91177308-0d34-0410-b5e6-96231b3b80d8

Test case for PR368

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14129 91177308-0d34-0410-b5e6-96231b3b80d8

Turn loads of ConstantPointerNulls into loads of zero... don't spill
them into the constant pool.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14128 91177308-0d34-0410-b5e6-96231b3b80d8

Add the isunordered intrinsic.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14127 91177308-0d34-0410-b5e6-96231b3b80d8

Add feature test for llvm intrinsics. It currently contains only the "isunordered" intrinsic

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14126 91177308-0d34-0410-b5e6-96231b3b80d8

Updated the BytecodeAnalysis data structure to contain additional fields
needed for analysis of individual functions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14125 91177308-0d34-0410-b5e6-96231b3b80d8

Added an isPhiNode(unsigned) static method to determine if an opcode is
a PhiNode or not. Needed by Bytecode Analyzer.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14124 91177308-0d34-0410-b5e6-96231b3b80d8

Remove tabs.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14123 91177308-0d34-0410-b5e6-96231b3b80d8

Implement detailed function level data collection and reporting.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14122 91177308-0d34-0410-b5e6-96231b3b80d8

Adjust prototypes to new Handler interface.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14121 91177308-0d34-0410-b5e6-96231b3b80d8

Make the parser deal with functions instead of just function types.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14120 91177308-0d34-0410-b5e6-96231b3b80d8

Clean up documentation and naming of variables.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14119 91177308-0d34-0410-b5e6-96231b3b80d8

Remove extra space.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14117 91177308-0d34-0410-b5e6-96231b3b80d8

Doxygenize a comment.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14115 91177308-0d34-0410-b5e6-96231b3b80d8

Made detailed output the default and changed -details option to -nodetails.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14114 91177308-0d34-0410-b5e6-96231b3b80d8

Implemented the bulk of the functionality. Cleaned up the code.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14113 91177308-0d34-0410-b5e6-96231b3b80d8

Allow dates with slashes in them in $DateRE.
Don't match on $Filename (which will be unset) if we hit 'UNMATCHABLE:'.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14112 91177308-0d34-0410-b5e6-96231b3b80d8

Fix the prolog epilog code inserter to match the documentation and support
targets whose stack grows up.

Patch contributed by Vladimir Prus

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14111 91177308-0d34-0410-b5e6-96231b3b80d8

Fix the fixed stack offset, patch contributed by Vladimir Prus

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14110 91177308-0d34-0410-b5e6-96231b3b80d8

Fix a bug in my checkin from last night that caused miscompilations of
186.crafty, fhourstones and 132.ijpeg.

Bugpoint makes really nasty miscompilations embarassingly easy to find.  It
narrowed it down to the instcombiner and this testcase (from fhourstones):

bool %l7153_l4706_htstat_loopentry_2E_4_no_exit_2E_4(int* %i, [32 x int]* %works, int* %tmp.98.out) {
newFuncRoot:
        %tmp.96 = load int* %i          ; <int> [#uses=1]
        %tmp.97 = getelementptr [32 x int]* %works, long 0, int %tmp.96         ; <int*> [#uses=1]
        %tmp.98 = load int* %tmp.97             ; <int> [#uses=2]
        %tmp.99 = load int* %i          ; <int> [#uses=1]
        %tmp.100 = and int %tmp.99, 7           ; <int> [#uses=1]
        %tmp.101 = seteq int %tmp.100, 7                ; <bool> [#uses=2]
        %tmp.102 = cast bool %tmp.101 to int            ; <int> [#uses=0]
        br bool %tmp.101, label %codeRepl4.exitStub, label %codeRepl3.exitStub

codeRepl4.exitStub:             ; preds = %newFuncRoot
        store int %tmp.98, int* %tmp.98.out
        ret bool true

codeRepl3.exitStub:             ; preds = %newFuncRoot
        store int %tmp.98, int* %tmp.98.out
        ret bool false
}

... which only has one combination performed on it:

$ llvm-as < t.ll | opt -instcombine -debug | llvm-dis
IC: Old =       %tmp.101 = seteq int %tmp.100, 7                ; <bool> [#uses=1]
    New =       setne int %tmp.100, 0           ; <bool>:<badref> [#uses=0]
IC: MOD =       br bool %tmp.101, label %codeRepl3.exitStub, label %codeRepl4.exitStub
IC: MOD =       %tmp.97 = getelementptr [32 x int]* %works, uint 0, int %tmp.96         ; <int*> [#uses=1]

It doesn't get much better than this.  :)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14109 91177308-0d34-0410-b5e6-96231b3b80d8

More minor cleanups

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14108 91177308-0d34-0410-b5e6-96231b3b80d8

Eliminate many occurrances of Instruction::

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14107 91177308-0d34-0410-b5e6-96231b3b80d8

Share some code

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14106 91177308-0d34-0410-b5e6-96231b3b80d8

Add new BinaryOperator::createAdd/Sub/... methods to avoid having to type
llvm::Instruction:: all of the time.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14105 91177308-0d34-0410-b5e6-96231b3b80d8

Tolerate more errors

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14104 91177308-0d34-0410-b5e6-96231b3b80d8

Encode %fsr correctly; don't fail an assertion.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14103 91177308-0d34-0410-b5e6-96231b3b80d8

Fix encoding of ST*FSR instructions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14102 91177308-0d34-0410-b5e6-96231b3b80d8

Fix assertion failure message to have the right method name.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14101 91177308-0d34-0410-b5e6-96231b3b80d8

Make the asmwriter much more tolerant of errors (which are common when working
on new front-ends and stuff).  Also get rid of some tabs that snuck in.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14100 91177308-0d34-0410-b5e6-96231b3b80d8

Columnized the compilation statistics for easier reading.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14099 91177308-0d34-0410-b5e6-96231b3b80d8

Fix the really bizarre stuff that happened last night in the tester
due to non-numeric diff failures that caused fpcmp to go into infinite loops

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14098 91177308-0d34-0410-b5e6-96231b3b80d8

Made it possible for the printInfoComment method to invoke getSlot in
such a way that if the Value being printed is standalone that we don't
assert and abort but just print ":??" for the slot number instead.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14097 91177308-0d34-0410-b5e6-96231b3b80d8

Fix for PR#366.  We use getClassB() so that we can handle cast instructions
that cast to bool.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14096 91177308-0d34-0410-b5e6-96231b3b80d8

Implement InstCombine/select.ll:test15*

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14095 91177308-0d34-0410-b5e6-96231b3b80d8

More instcombine testcases

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14094 91177308-0d34-0410-b5e6-96231b3b80d8

Cleanup alignment of output.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14093 91177308-0d34-0410-b5e6-96231b3b80d8

Add some new fields for bytecode analysis.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14092 91177308-0d34-0410-b5e6-96231b3b80d8

Implement analysis output. Don't dump function details unless requested.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14091 91177308-0d34-0410-b5e6-96231b3b80d8

Implement some rudimentary analysis.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14090 91177308-0d34-0410-b5e6-96231b3b80d8

Clean up indentation of file body output.
Don't dump functions unless "detailedResults" is requested.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14089 91177308-0d34-0410-b5e6-96231b3b80d8

Move parsing details to Parser.cpp.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14088 91177308-0d34-0410-b5e6-96231b3b80d8

Bring some things out of header files that belong only in this file.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14087 91177308-0d34-0410-b5e6-96231b3b80d8

Be more careful about the order we put stuff onto the worklist.  This allow us to
collapse this:
bool %le(int %A, int %B) {
        %c1 = setgt int %A, %B
        %tmp = select bool %c1, int 1, int 0
        %c2 = setlt int %A, %B
        %result = select bool %c2, int -1, int %tmp
        %c3 = setle int %result, 0
        ret bool %c3
}

into:

bool %le(int %A, int %B) {
        %c3 = setle int %A, %B          ; <bool> [#uses=1]
        ret bool %c3
}

which is handy, because the Java FE makes these sequences all over the place.

This is tested as: test/Regression/Transforms/InstCombine/JavaCompare.ll

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14086 91177308-0d34-0410-b5e6-96231b3b80d8

New testcase that is important for the Java FE

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14085 91177308-0d34-0410-b5e6-96231b3b80d8

Cleaned up a dead header file to prevent duplicate definition warnings
in doxygen.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14084 91177308-0d34-0410-b5e6-96231b3b80d8

Implement select.ll:test14*

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14083 91177308-0d34-0410-b5e6-96231b3b80d8

New testcase for the instruction combiner that happen often in the Java FE

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14082 91177308-0d34-0410-b5e6-96231b3b80d8

Minor tweaks

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14081 91177308-0d34-0410-b5e6-96231b3b80d8

Regularize title of Regression Test section. Clean up some blank space.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14080 91177308-0d34-0410-b5e6-96231b3b80d8

Bug fixed

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14079 91177308-0d34-0410-b5e6-96231b3b80d8

Workaround or a VS miscompilation bug

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14078 91177308-0d34-0410-b5e6-96231b3b80d8

I checked and no clients expect this to return null for unconditional branches
Simplify code and make it more uniform.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14077 91177308-0d34-0410-b5e6-96231b3b80d8

Don't grab the condition of unconditional branches!
This fixes PR363

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14076 91177308-0d34-0410-b5e6-96231b3b80d8

Fix a minor bug in the map - since this pass adds a global symbol, it must be
accounted for in the map (at least, in its current format).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14075 91177308-0d34-0410-b5e6-96231b3b80d8

Add a forwarding method pop_front() that allows you to delete instructions
from the beginning of a MBB.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14074 91177308-0d34-0410-b5e6-96231b3b80d8

Add a TmpInstruction ctor that doesn't take a MCFI.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14073 91177308-0d34-0410-b5e6-96231b3b80d8

Explicitly specify libtool tag "CXX" so that if you setenv CXX to something
libtool can't parse, e.g., "/path/to/g++ -some-funny-options",
then it will still be able to compile and link.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14072 91177308-0d34-0410-b5e6-96231b3b80d8

Fix a link error using VS8.0

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14071 91177308-0d34-0410-b5e6-96231b3b80d8

Apparently a particular vendor compiler uses the struct/class tag to MANGLE
symbols with.  Therefore, if you do not use struct/class consistently, you can
get LINK ERRORS.  grr.

This fixes the link errors for libsupport and vmcore.

-Chris

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14070 91177308-0d34-0410-b5e6-96231b3b80d8

Fix case of doxygen directive `\p': it's lowercase.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14068 91177308-0d34-0410-b5e6-96231b3b80d8