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<div style="direction: ltr;font-family: Tahoma;color: #000000;font-size: 10pt;">The following code is causing me problems in the Sparc back-end and I believe it's related to a lot of issues that I have, so I'd love to work out what I need to do to resolve this.
I'm currently not making much headway into it. I'm going to try to simplify this to the core problem I can see and hope I haven't missed anything relevant.
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<div>The original code I have is as follows:</div>
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<div><font face="Courier New">typedef char vec8 __attribute__((vector_size(4)));</font></div>
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<div><font face="Courier New">extern vec8 foo1_8(void);</font></div>
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<div><font face="Courier New">extern vec8 foo2_8(void);</font></div>
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<div><font face="Courier New">vec8 fun8(void)</font></div>
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<div><font face="Courier New">{</font></div>
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<div><font face="Courier New"> return foo1_8 () & foo2_8 ();</font></div>
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<div><font face="Courier New">}</font></div>
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<div>On x86, this compiles into this IR:</div>
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<div><font face="Courier New">; Function Attrs: nounwind uwtable</font></div>
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<div><font face="Courier New">define i32 @fun8() #0 !dbg !4 {</font></div>
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<div><font face="Courier New"> %1 = tail call i32 @foo1_8() #2, !dbg !23</font></div>
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<div><font face="Courier New"> %2 = tail call i32 @foo2_8() #2, !dbg !24</font></div>
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<div><font face="Courier New"> %3 = and i32 %2, %1, !dbg !26</font></div>
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<div><font face="Courier New"> ret i32 %3, !dbg !27</font></div>
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<div><font face="Courier New">}</font></div>
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<div>On Sparc, this compiles into this IR:</div>
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<div><font face="Courier New">; Function Attrs: nounwind</font></div>
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<div><font face="Courier New">define <4 x i8> @fun8() #0 !dbg !4 {</font></div>
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<div><font face="Courier New"> %1 = tail call <4 x i8> @foo1_8() #2, !dbg !23</font></div>
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<div><font face="Courier New"> %2 = tail call <4 x i8> @foo2_8() #2, !dbg !24</font></div>
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<div><font face="Courier New"> %3 = and <4 x i8> %2, %1, !dbg !26</font></div>
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<div><font face="Courier New"> ret <4 x i8> %3, !dbg !27</font></div>
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<div><font face="Courier New">}</font></div>
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<div>When I try to compile this down to an object file using llc, I get this error for Sparc (none for x86):</div>
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<div> LowerCall didn't emit the correct number of values!</div>
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<div>It appears that the Sparc system doesn't know how to lower calls using vectors. I need to either be able to (1) Work out how to get clang to compile the Sparc code into something more similar to the x86 code, or (2) to work out how to get the llc backend
for sparc to know how to lower calls containing vectors.</div>
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<div>I'd prefer to do the first of these and get the vectors represented as registers. This seems more efficient.</div>
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<div>Any help pointing me in the right direction will be greatly appreciated. I don't suppose there's anything as simple a a clang command-line flag that will do this???</div>
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<div>Chris Dewhurst,</div>
<div>LERO, The Irish Software Research Centre,</div>
<div>University of Limerick.</div>
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