[LLVMdev] Whole-function isel

[Christopher Lamb]

My mistake Evan, they are SEME regions. I had a chat with a friend  
about hyper-blocks the other day and got confused in my email. =)

--
Chris

On Apr 22, 2008, at 12:27 AM, Evan Cheng wrote:

> Very nice! Why did you decide on hyperblock instead of SEME region and
> how are you forming the blocks?
>
> Evan
>
> On Apr 20, 2008, at 9:59 PM, Christopher Lamb wrote:
>
>> I thought I'd share a little bit of progress I made this weekend.
>> I've gotten the first interesting test-case (a simple switch)
>> through hyperblock-based DAGISel, and there's a pretty picture too!
>> Each part of the switch is emitted directly into the DAG, rather
>> than being deferred.
>>
>> This is the function:
>> define i32 @foo(i32 %x, i32 %z) nounwind  {
>> entry:
>>        switch i32 %x, label %UnifiedReturnBlock [
>>                 i32 0, label %bb
>>                 i32 1, label %bb5
>>        ]
>> bb:             ; preds = %entry
>>        %tmp4 = mul i32 %z, %x          ; <i32> [#uses=1]
>>        ret i32 %tmp4
>> bb5:            ; preds = %entry
>>        %tmp8 = add i32 %z, %x          ; <i32> [#uses=1]
>>        ret i32 %tmp8
>> UnifiedReturnBlock:             ; preds = %entry
>>        ret i32 %z
>> }
>>
>> And here's the X86 DAG right before it gets fed one BB at a time
>> into pre-RA scheduling. Each color is a different basic block.
>>
>> Cheers!
>> --
>> Chris
>>
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--
Christopher Lamb



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