llvm-svn: 35729

work for PR 1171.

llvm-svn: 35728

on PR1171.

llvm-svn: 35726

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This is the beginning of work for PR1171.

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first and then range testing second.

llvm-svn: 35715

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SimplifyLibCalls/2007-04-06-strchr-miscompile.ll and PR1307

llvm-svn: 35706

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the start index of the array as well as the length.  No functionality change.

llvm-svn: 35703

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llvm-svn: 35689

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elsewhere.

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some constant exprs to apints).

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

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ldecod now passes.

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2. Use cheaper APInt methods.

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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.

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test/Transforms/InstCombine/xor.ll:test28

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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