[clang-tools-extra] [clang] [llvm] [X86] Emit Warnings for frontend options to enable knl/knm specific ISAs. (PR #75580)

[Freddy Ye via cfe-commits]

https://github.com/FreddyLeaf closed 
https://github.com/llvm/llvm-project/pull/75580
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[clang-tools-extra] [clang] [llvm] [X86] Emit Warnings for frontend options to enable knl/knm specific ISAs. (PR #75580)

[Freddy Ye via cfe-commits]

FreddyLeaf wrote:

Thank you all!

https://github.com/llvm/llvm-project/pull/75580
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[clang-tools-extra] [clang] [llvm] [X86] Emit Warnings for frontend options to enable knl/knm specific ISAs. (PR #75580)

[Freddy Ye via cfe-commits]

https://github.com/FreddyLeaf edited 
https://github.com/llvm/llvm-project/pull/75580
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[clang-tools-extra] [clang] [llvm] [X86] Emit Warnings for frontend options to enable knl/knm specific ISAs. (PR #75580)

[Shengchen Kan via cfe-commits]

https://github.com/KanRobert approved this pull request.


https://github.com/llvm/llvm-project/pull/75580
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[clang-tools-extra] [clang] [llvm] [X86] Emit Warnings for frontend options to enable knl/knm specific ISAs. (PR #75580)

[Phoebe Wang via cfe-commits]

@@ -933,6 +933,14 @@ X86 Support
 - Support ISA of ``AVX10.1``.
 - ``-march=pantherlake`` and ``-march=clearwaterforest`` are now supported.
 - Added ABI handling for ``__float128`` to match with GCC.
+- Emit warnings for options to enable knl/knm specific ISAs: AVX512PF, AVX512ER
+  and PREFETCHWT1. From next version (LLVM 19), these ISAs' intrinsic supports
+  will be deprecated:
+  * intrinsic series of *_exp2a23_*
+  * intrinsic series of *_rsqrt28_*
+  * intrinsic series of *_rcp28_*
+  * intrinsic series of *_prefetch_i[3|6][2|4]gather_*
+  * intrinsic series of *_prefetch_i[3|6][2|4]scatter_*

phoebewang wrote:

Thanks @topperc ! You are correct, I forgot that.
KNL has a seperate feature called `prefetchwt1`, but the intrinsic/mnemonic is 
the same.

https://github.com/llvm/llvm-project/pull/75580
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[clang-tools-extra] [clang] [llvm] [X86] Emit Warnings for frontend options to enable knl/knm specific ISAs. (PR #75580)

[Phoebe Wang via cfe-commits]

@@ -933,6 +933,14 @@ X86 Support
 - Support ISA of ``AVX10.1``.
 - ``-march=pantherlake`` and ``-march=clearwaterforest`` are now supported.
 - Added ABI handling for ``__float128`` to match with GCC.
+- Emit warnings for options to enable knl/knm specific ISAs: AVX512PF, AVX512ER
+  and PREFETCHWT1. From next version (LLVM 19), these ISAs' intrinsic supports
+  will be deprecated:
+  * intrinsic series of *_exp2a23_*
+  * intrinsic series of *_rsqrt28_*
+  * intrinsic series of *_rcp28_*
+  * intrinsic series of *_prefetch_i[3|6][2|4]gather_*
+  * intrinsic series of *_prefetch_i[3|6][2|4]scatter_*

phoebewang wrote:

And `_m_prefetchw`

https://github.com/llvm/llvm-project/pull/75580
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[clang-tools-extra] [clang] [llvm] [X86] Emit Warnings for frontend options to enable knl/knm specific ISAs. (PR #75580)

[Phoebe Wang via cfe-commits]

@@ -69,7 +69,10 @@
 // RUN: %clang_cl -m32 -arch:avx2 --target=i386-pc-windows -### -- 2>&1 %s | 
FileCheck -check-prefix=avx2 %s
 // avx2: invalid /arch: argument
 
-// RUN: %clang_cl -m32 -arch:AVX512F --target=i386-pc-windows /c /Fo%t.obj 
-Xclang -verify -DTEST_32_ARCH_AVX512F -- %s
+// RUN: %clang_cl -m32 -arch:AVX512F --target=i386-pc-windows /c /Fo%t.obj 
-Xclang -verify=KNL1 -DTEST_32_ARCH_AVX512F -- %s

phoebewang wrote:

Do you mean AVX512PF? By clang-cl?

https://github.com/llvm/llvm-project/pull/75580
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[clang-tools-extra] [clang] [llvm] [X86] Emit Warnings for frontend options to enable knl/knm specific ISAs. (PR #75580)

[Simon Pilgrim via cfe-commits]

@@ -933,6 +933,9 @@ X86 Support
 - Support ISA of ``AVX10.1``.
 - ``-march=pantherlake`` and ``-march=clearwaterforest`` are now supported.
 - Added ABI handling for ``__float128`` to match with GCC.
+- Emit Warnings for clang options to enable knl/knm. From next version
+  (LLVM 19), all-end supports on knl/knm and other Xeon Phi targets will be
+  removed.

RKSimon wrote:

This needs rephrasing - to list all the ISAs that are deprecated and the 
intrinsics will be removed.

https://github.com/llvm/llvm-project/pull/75580
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