llvm-svn: 35595

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: 35591

equality comparisons of a constant.  This allows us to codegen the 'sintzero'
loop in PR1288 as:

LBB1_1: ;cond_next
        li r4, 0
        addi r2, r2, 1
        stw r4, 0(r3)
        addi r3, r3, 4
        cmpwi cr0, r2, -1
        bne cr0, LBB1_1 ;cond_next

instead of:

LBB1_1: ;cond_next
        addi r2, r2, 1
        li r4, 0
        xoris r5, r2, 65535
        stw r4, 0(r3)
        addi r3, r3, 4
        cmplwi cr0, r5, 65535
        bne cr0, LBB1_1 ;cond_next

This implements CodeGen/PowerPC/compare-simm.ll, and also cuts 74
instructions out of kc++.

llvm-svn: 35590

llvm-svn: 35589

llvm-svn: 35588

llvm-svn: 35587

llvm-svn: 35586

llvm-svn: 35585

test/Transforms/InstCombine/xor.ll:test28

llvm-svn: 35584

llvm-svn: 35583

llvm-svn: 35582

llvm-svn: 35581

llvm-svn: 35580

llvm-svn: 35579

llvm-svn: 35578

intrinsics works.

llvm-svn: 35577

llvm-svn: 35576

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: 35574

flags (ARMISD::CMPNZ) and comparisons that use all flags (ARMISD::CMP).
- Defines the instructions: TST, TEQ (ARM) and TST (Thumb).

llvm-svn: 35573

llvm-svn: 35572

llvm-svn: 35571

llvm-svn: 35570

llvm-svn: 35569

llvm-svn: 35568

Make sure that the CTPOP result is casted to i32 as the bit counting
intrinsics all return i32 now (this affects CTLZ and CTTZ as well).

llvm-svn: 35567

this intrinsic.

llvm-svn: 35566

rules for overloaded intrinsic functions.

llvm-svn: 35565

llvm-svn: 35564

llvm-svn: 35563

llvm-svn: 35562

llvm-svn: 35561

llvm-svn: 35560

llvm-svn: 35559

llvm-svn: 35558

llvm-svn: 35557

last night's regression in SingleSource/UnitTests/2005-05-11-Popcount-ffs-fls

llvm-svn: 35556