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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Keane, Erich <erich.keane@intel.com><br>
<b>Sent:</b> Tuesday, May 19, 2020 8:10 AM<br>
<b>To:</b> Finkel, Hal J. <hfinkel@anl.gov>; Min-Yih Hsu <minyihh@uci.edu><br>
<b>Cc:</b> cfe-dev@lists.llvm.org <cfe-dev@lists.llvm.org><br>
<b>Subject:</b> RE: [cfe-dev] [RFC] Ternary operator with vector type predicate</font>
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What is the intent with the ext-vector-types? </p>
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That's a really good question. I've always thought of them as a slightly-more-convenient version of the vector types, although I suppose that they're really supposed to be OpenCL vectors. The Clang extension docs say, "OpenCL vector types are created using
the ext_vector_type attribute. It supports the V.xyzw syntax and other tidbits as seen in OpenCL." Thus, for OpenCL, I suppose that it is supposed to do this: <a href="https://www.khronos.org/registry/OpenCL/specs/2.2/html/OpenCL_C.html#operators-ternary-selection" id="LPlnk297614">https://www.khronos.org/registry/OpenCL/specs/2.2/html/OpenCL_C.html#operators-ternary-selection</a></p>
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-Hal</p>
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It seems to me that it is an incompatible extension without anyone really maintaining them, and slightly different SEMA rules (for seemingly no reason).</p>
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The conditional operator for the vector_size value was implemented as a GCC compatibility option, but no such motivation existed for ext-vetctor-types.</p>
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That said, the semantic analysis for this in ext-vector-types is sufficiently different that it wasn’t possible to combine implementations. The rules had diverged significantly at one point, so there wasn’t really a way to do so compatibly.</p>
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<b>From:</b> Finkel, Hal J. <hfinkel@anl.gov> <br>
<b>Sent:</b> Tuesday, May 19, 2020 6:05 AM<br>
<b>To:</b> Keane, Erich <erich.keane@intel.com>; Min-Yih Hsu <minyihh@uci.edu><br>
<b>Cc:</b> cfe-dev@lists.llvm.org<br>
<b>Subject:</b> Re: [cfe-dev] [RFC] Ternary operator with vector type predicate</p>
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<span style="font-size:12.0pt; color:black">In general, I don't like to see features supported by not-ext-vector types that are not supported by ext-vector types.</span></p>
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<span style="font-size:12.0pt; color:black">That having been said, is this related to our discussion on bool vectors:</span></p>
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<span style="font-size:12.0pt; color:black"> <a href="http://lists.llvm.org/pipermail/cfe-dev/2020-May/065434.html">http://lists.llvm.org/pipermail/cfe-dev/2020-May/065434.html</a></span></p>
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<span style="font-size:12.0pt; color:black"> -Hal</span></p>
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<span style="font-size:10.0pt">Hal Finkel<br>
Lead, Compiler Technology and Programming Languages<br>
Leadership Computing Facility<br>
Argonne National Laboratory</span></p>
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<b><span style="color:black">From:</span></b><span style="color:black"> cfe-dev <<a href="mailto:cfe-dev-bounces@lists.llvm.org">cfe-dev-bounces@lists.llvm.org</a>> on behalf of Min-Yih Hsu via cfe-dev <<a href="mailto:cfe-dev@lists.llvm.org">cfe-dev@lists.llvm.org</a>><br>
<b>Sent:</b> Friday, May 8, 2020 1:17 PM<br>
<b>To:</b> Keane, Erich <<a href="mailto:erich.keane@intel.com">erich.keane@intel.com</a>><br>
<b>Cc:</b> <a href="mailto:cfe-dev@lists.llvm.org">cfe-dev@lists.llvm.org</a> <<a href="mailto:cfe-dev@lists.llvm.org">cfe-dev@lists.llvm.org</a>><br>
<b>Subject:</b> Re: [cfe-dev] [RFC] Ternary operator with vector type predicate</span>
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Interesting….then I think the question simply becomes whether we should support it in ext_vector_type as well.
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Thanks for the pointer</p>
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-Min</p>
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On May 8, 2020, at 11:04 AM, Keane, Erich <<a href="mailto:erich.keane@intel.com">erich.keane@intel.com</a>> wrote:</p>
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Note that this was implemented for non-ext-vector types here:</p>
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<a href="https://github.com/llvm/llvm-project/commit/349636d2bfc39a5c81a835a95d203a42d9f9301a"><span style="color:purple">https://github.com/llvm/llvm-project/commit/349636d2bfc39a5c81a835a95d203a42d9f9301a</span></a></p>
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Which matches the GCC version. <span class="x_xapple-converted-space"> </span></p>
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The attribute is vector_size, not ext_vector_type however.</p>
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Otherwise, it does everything you’re proposing (like I said, just with a more portable vector-type definition).</p>
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<b>From:</b><span class="x_xapple-converted-space"> </span>cfe-dev <<a href="mailto:cfe-dev-bounces@lists.llvm.org">cfe-dev-bounces@lists.llvm.org</a>><span class="x_xapple-converted-space"> </span><b>On Behalf Of<span class="x_xapple-converted-space"> </span></b>Min-Yih
Hsu via cfe-dev<br>
<b>Sent:</b><span class="x_xapple-converted-space"> </span>Friday, May 8, 2020 10:58 AM<br>
<b>To:</b><span class="x_xapple-converted-space"> </span><a href="mailto:cfe-dev@lists.llvm.org">cfe-dev@lists.llvm.org</a><br>
<b>Subject:</b><span class="x_xapple-converted-space"> </span>[cfe-dev] [RFC] Ternary operator with vector type predicate</p>
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Hi folks,</p>
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In clang’s vector extension, the ternary operator (?:) is able to select from two vector type values based on the boolean type predicate. For example:</p>
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```</p>
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typedef float float4 __attribute__((ext_vector_type(4)));</p>
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float4 foo(bool cond, float4 a, float4 b) {</p>
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return cond? a : b;</p>
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}</p>
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```</p>
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However, clang currently doesn’t support vector type values as the predicates. So code shown below won’t compile:</p>
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```</p>
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float4 foo(float4 a, float4 b) {</p>
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return a > b? a : b;</p>
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}</p>
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```</p>
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Which is essentially just a max function that can be implemented by hardware instructions (vmaxps in Intel AVX for example) efficiently.</p>
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I’m proposing to support vector type values as predicates in the ternary operator: If the predicate value has vector type, each of its element would be converted to bool before being used to select corresponding elements from the second or third operands. Note
that this is exactly what GCC is doing right now [1] in their vector extensions.</p>
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On the (IR) codegen side, since the IR `select`, `icmp`, and `fcmp` instruction all support vector type values as the operands, I don’t think there are much trouble in it.</p>
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Here are the reasons and some advantages:</p>
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1. It provides more flexibility for programmers to do conditional selections on vectors. Especially for cases that can be optimized by hardware instructions like the motivated example above.</p>
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2. It will not break the current usages of ternary operator: If the predicate is a scalar value, it’s still sticking to the current model.</p>
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3. If the goal of our extensions is aiming to “support a broad range of GCC extensions”. Then the behavior should also be as consistent as possible.</p>
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I’ll try to come up with a patch for preview as soon as possible.</p>
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Also a slightly off-topic thing: In our document [2], the ternary operator has always been mis-typed as ‘:?’ Maybe we should fix it some times.</p>
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Thanks for the feedbacks in advance.</p>
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-Min</p>
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[1]: <a href="https://gcc.gnu.org/onlinedocs/gcc/Vector-Extensions.html"><span style="color:purple">https://gcc.gnu.org/onlinedocs/gcc/Vector-Extensions.html</span></a></p>
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[2]: <a href="https://clang.llvm.org/docs/LanguageExtensions.html#vectors-and-extended-vectors"><span style="color:purple">https://clang.llvm.org/docs/LanguageExtensions.html#vectors-and-extended-vectors</span></a></p>
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