llvm-svn: 41051

llvm-svn: 41050

see if the base register is already occupied before assuming it can be
used. This fixes bogus code generation in the accompanying testcase.

llvm-svn: 41049

llvm-svn: 41048

llvm-svn: 41047

Into: inttoptr (i64 0 to i8*)  -> null

This occurs in the example in PR1602.  With this fixed, we now compile
the example in PR1602 into fully "devirtualized" code:

define void @_Z1g1S(%struct.S* noalias  %s) {
entry:        %tmp131415 = getelementptr %struct.S* %s, i32 0, i32 0          ; <i32 (...)***> [#uses=1]        %tmp16 = load i32 (...)*** %tmp131415, align 4          ; <i32 (...)**> [#uses=1]
        %tmp26277 = load i32 (...)** %tmp16             ; <i32 (...)*> [#uses=1]
        %tmp2829 = bitcast i32 (...)* %tmp26277 to void (%struct.S*)*           ; <void (%struct.S*)*> [#uses=1]
        tail call void %tmp2829( %struct.S* %s )
        ret void
}

This still has the vtable dispatch (as required) but does not have any pointer
to method cruft left.

llvm-svn: 41046

llvm-svn: 41043

the list of link time passes to be run, just as for opt, with the
-debug-pass=Arguments option.

llvm-svn: 41040

llvm-svn: 41039

llvm-svn: 41034

better, gives the compiler a chance to validate the cast and reduces warnings
if the user turns on -Wold-style-cast option.

llvm-svn: 41033

llvm-svn: 41029

llvm-svn: 41028

llvm-svn: 41024

us to fold the entry block of PR1602 to false instead of:

br i1 icmp eq (i32 and (i32 ptrtoint (void (%struct.S*)* inttoptr (i64
1 to void (%struct.S*)*) to i32), i32 1), i32 0), label %cond_next, label
%cond_true

llvm-svn: 41023

have complex pointer manipulation going on.  This allows us to compile
stuff like this:

__m128i foo(__m128i x){
                static const unsigned int c_0[4] = { 0, 0, 0, 0 };
                __m128i v_Zero = _mm_loadu_si128((__m128i*)c_0);
                x  = _mm_unpacklo_epi8(x,  v_Zero);
                return x;
}

into:

_foo:
        xorps   %xmm1, %xmm1
        punpcklbw       %xmm1, %xmm0
        ret

llvm-svn: 41022

llvm-svn: 41021

able to 3-addressify away stuff like this:

        movl    %ecx, %eax
        decl    %eax

llvm-svn: 41020

the pass arguments that it supports.

llvm-svn: 41019

llvm-svn: 41018

Make a 'memop' pattern just for them.

llvm-svn: 41017

llvm-svn: 41016

llvm-svn: 41013

llvm-svn: 41012

Increase efficiency of sign_extend_inreg by using subregisters for truncation. As the README suggests sign_extend_subreg is selected to (sext(trunc)).

llvm-svn: 41010

llvm-svn: 41009

Add 2-addr to 3-addr promotion code that allows 32-bit LEA to be used via subregisters when 16-bit LEA is disabled.

llvm-svn: 41007

Move isSubRegOf into MRegisterInfo. Fix a missed move elimination in LowerSubregs and add more debugging output there.

llvm-svn: 41005

llvm-svn: 41001

llvm-svn: 40998

llvm-svn: 40997

llvm-svn: 40991

llvm-svn: 40990

llvm-svn: 40989

"| grep foo | wc -l | grep 2" idiom used by many tests, so that, for
example, tests don't mistakenly accept a count of 12 when 2 is
expected. Also, the new form is more consice: "| grep foo | count 2".

llvm-svn: 40988

use an intptr ValueType instead of i32 for the index operand in
getCopyToParts.

llvm-svn: 40987

llvm-svn: 40986

llvm-svn: 40985

memcpy with zero length is hugely expensive, so avoid it.  This speeds up coallescing from 1.17s to 0.88s on siod.

llvm-svn: 40984

an empty vector.  This speeds up llc slightly.

llvm-svn: 40983