webrev for Graal HSAIL backend

[Christian Thalinger]

Before I'm going into review details, how are we going to handle this review?  Like any other OpenJDK review which means we do review-change iterations until we all agree it's good?

-- Chris

On Jun 11, 2013, at 3:16 PM, "Venkatachalam, Vasanth" <Vasanth.Venkatachalam at amd.com> wrote:

> 
> Hi,
> 
> The AMD Sumatra team has submitted a webrev (http://cr.openjdk.java.net/~ecaspole/graal_hsail/) that adds HSAIL code generation support for Graal, allowing Java programs to be compiled and executed on HSAIL-enabled GPU/APU devices. While this work is a prototype, we have included several working unit test cases, including Mandelbrot and NBody.
> 
> Features
> 
> Arithmetic operations for integers, longs, doubles, and floats
> Loads, stores and move operations
> Min/max/rem/carry operations for integers and longs
> Conversion operations - (currently support conversions between integers and floats, integers and doubles, integers and longs, floats and doubles).
> Some math library operations (e.g., square root).
> Support for JDK8 lambda constructs.
> 
> Known Issues
> 
> -The logic to handle register spilling is work-in-progress, so not all test cases that induce spilling are guaranteed to work.
> -X86 register encodings are being passed to the HSAIL backend. The calling convention returned by getCallingConvention() currently returns an x86 calling convention
> -Function call support has yet to be implemented.
> 
> For a detailed list of unsupported features, refer to the routines that are emitting "NYI" in HSAILLIRGenerator.java
> 
> The test cases (except for BasicHSAILTest) require an HSAIL simulator or hardware to execute, but in lieu of a simulator or hardware they will output the HSAIL code generated, which is useful for debugging. Moreover, BasicHSAILTest provides a template for adding Java code snippets and viewing the HSAIL generated code without executing the code.
> 
> We encourage the community to support this new backend and extend it with additional features.
> 
> Vasanth
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