llvm-svn: 35792

Transforms/InstCombine/vec_insertelt.ll and fixes PR1286.

We now compile the code from that bug into:

_foo:
        movl 4(%esp), %eax
        movdqa (%eax), %xmm0
        movl 8(%esp), %ecx
        psllw (%ecx), %xmm0
        movdqa %xmm0, (%eax)
        ret

instead of:

_foo:
        subl $4, %esp
        movl %ebp, (%esp)
        movl %esp, %ebp
        movl 12(%ebp), %eax
        movdqa (%eax), %xmm0
        #IMPLICIT_DEF %eax
        pinsrw $2, %eax, %xmm0
        xorl %ecx, %ecx
        pinsrw $3, %ecx, %xmm0
        pinsrw $4, %eax, %xmm0
        pinsrw $5, %ecx, %xmm0
        pinsrw $6, %eax, %xmm0
        pinsrw $7, %ecx, %xmm0
        movl 8(%ebp), %eax
        movdqa (%eax), %xmm1
        psllw %xmm0, %xmm1
        movdqa %xmm1, (%eax)
        movl %ebp, %esp
        popl %ebp
        ret

woo :)

llvm-svn: 35788

llvm-svn: 35765

llvm-svn: 35763

Add a new xform to simplify (A&B)|(~A&C).  THis implements InstCombine/or2.ll:test1

llvm-svn: 35760

llvm-svn: 35734

llvm-svn: 35731

llvm-svn: 35724

llvm-svn: 35719

llvm-svn: 35718

first and then range testing second.

llvm-svn: 35715

llvm-svn: 35714

llvm-svn: 35700

llvm-svn: 35680

elsewhere.

llvm-svn: 35668

llvm-svn: 35665

llvm-svn: 35655

some constant exprs to apints).

Thanks to Anton for tracking down a small testcase that triggered this!

llvm-svn: 35633

ldecod now passes.

llvm-svn: 35626

llvm-svn: 35620

llvm-svn: 35615

llvm-svn: 35614

llvm-svn: 35612

llvm-svn: 35607

2. Use cheaper APInt methods.

llvm-svn: 35594

llvm-svn: 35593

target hook.  This allows us to codegen a loop as:

LBB1_1: @cond_next
        mov r2, #0
        str r2, [r0, +r3, lsl #2]
        add r3, r3, #1
        cmn r3, #1
        bne LBB1_1      @cond_next

instead of:

LBB1_1: @cond_next
        mov r2, #0
        str r2, [r0], #+4
        add r3, r3, #1
        cmn r3, #1
        bne LBB1_1      @cond_next

This looks the same, but has one fewer induction variable (and therefore,
one fewer register) live in the loop.

llvm-svn: 35592

llvm-svn: 35588

llvm-svn: 35587

test/Transforms/InstCombine/xor.ll:test28

llvm-svn: 35584

isel has its own particular features that it wants in the CFG, in order to
reduce the number of times a constant is computed, etc.  Make sure that we
clean up the CFG before doing any other things for isel.  Doing so can
dramatically reduce the number of split edges and reduce the number of
places that constants get computed.  For example, this shrinks
CodeGen/Generic/phi-immediate-factoring.ll from 44 to 37 instructions on X86,
and from 21 to 17 MBB's in the output.  This is primarily a code size win,
not a performance win.

This implements CodeGen/Generic/phi-immediate-factoring.ll and PR1296.

llvm-svn: 35575

llvm-svn: 35563

llvm-svn: 35561

llvm-svn: 35555

Support overloaded intrinsics bswap, ctpop, cttz, ctlz.

llvm-svn: 35547

llvm-svn: 35536

llvm-svn: 35528

llvm-svn: 35525

llvm-svn: 35524

llvm-svn: 35510