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253 Commits

Author SHA1 Message Date
Longsheng Mou
000f2b5163 [X86_64] fix arg pass error in struct. (#86902) 
```
typedef long long t67 __attribute__((aligned (4)));
struct s67 {
  int a;
  t67 b;
};
void f67(struct s67 x) {
}
```
When classify:
a: Lo = Integer, Hi = NoClass
b: Lo = Integer, Hi = NoClass
struct S: Lo = Integer, Hi = NoClass

```
define dso_local void @f67(i64 %x.coerce) {
```
In this case, only one i64 register is used when the structure parameter
is transferred, which is obviously incorrect.So we need to treat the
split case specially. fix
https://github.com/llvm/llvm-project/issues/85387.
 2024-04-09 19:57:35 -07:00
Alex Voicu
ab7dba233a [CodeGen][LLVM] Make the va_list related intrinsics generic. (#85460) 
Currently, the builtins used for implementing `va_list` handling
unconditionally take their arguments as unqualified `ptr`s i.e. pointers
to AS 0. This does not work for targets where the default AS is not 0 or
AS 0 is not a viable AS (for example, a target might choose 0 to
represent the constant address space). This patch changes the builtins'
signature to take generic `anyptr` args, which corrects this issue. It
is noisy due to the number of tests affected. A test for an upstream
target which does not use 0 as its default AS (SPIRV for HIP device
compilations) is added as well.
 2024-03-27 11:41:34 +00:00
Longsheng Mou
9c8dd5e6f6 [X86_64] fix SSE type error in vaarg. (#86377) 
tweak the position of the ++neededSSE when Lo is NoClass and Hi is SSE.
Fix #86371.
 2024-03-26 09:19:42 +08:00
Zahira Ammarguellat
d9c4c312d8 [CLANG] Full support of complex multiplication and division. (#81514) 
In clang there are two options `-f[no]cx-limited-range` and
`-f[no]cx-fortran-rules` that control the range of complex
multiplication and division. However, it is unclear how these options
interact with one another. For instance, what should happen when the
users compile with `-fcx-fortran-rules -fno-cx-limited-range` or
`-fcx-limited-range -fno-cx-fortran-rules`?

In this patch we are introducing a new option to solve the issue and
give a greater flexibility to the user to control the behavior of the
compiler when performing multiplication and division of complex
floating-point values.

`-fcomplex-arihmetic=[full|improved|promoted|basic]`

`full`: Implementation of complex division and multiplication using a
call to runtime library functions (generally the case, but the BE might
sometimes replace the library call if it knows enough about the
potential range of the inputs). Overflow and non-finite values are
handled by the library implementation. For the case of multiplication
overflow will occur in accordance with normal floating-point rules. This
is the default value.

`improved`: Implementation of complex division using the Smith algorithm
at source precision. Smith's algorithm for complex division. See SMITH,
R. L. Algorithm 116: Complex division. Commun. ACM 5, 8 (1962). This
value offers improved handling for overflow in intermediate
calculations, but overflow may occur. NaN and infinite values are not
handled in some cases.

`promoted`: Implementation of complex division using algebraic formulas
at higher precision. Overflow is handled. Non-finite values are handled
in some cases. If the target does not have native support for a higher
precision data type, the implementation for the complex operation using
the Smith algorithm will be used. Overflow may still occur in some
cases. NaN and infinite values are not handled.

`basic`: Implementation of complex division and multiplication using
algebraic formulas at source precision. No special handling to avoid
overflow. NaN and infinite values are not handled.

`fcx-limited-range` will alias `-fcomplex-arithmetic=basic`
`-fcx-fortran-rules` will alias `-fcomplex-arithmetic=improved`
`-fno-cx-limited-range` and `-fno-cx-fortran-rules` will alias
`-fcomplex-arithmetic=full`

The complex division and multiplication will be implemented as follows
depending on the option used.

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<!--StartFragment-->


-fcomplex-arithmetic | div | mul
-- | -- | --
basic | algebraic form | algebraic form
improved | smith's algorithm | algebraic form
full | libcall | libcall + nan processing
promoted | algebraic form + higher precision | algebraic form



<!--EndFragment-->
</body>

</html>
 2024-03-20 12:14:09 -07:00
Simon Pilgrim
25d61be8a5 [X86] avx-shuffle-builtins.c - limit to x86 targets 
Attempt to fix issue with non-x86 buildbots (sorry its blind but I can't test this)
 2024-03-20 16:59:11 +00:00
Simon Pilgrim
7812fcf3d7 [VectorCombine] foldBitcastShuf - add support for binary shuffles (REAPPLIED) 
Generalise fold to "bitcast (shuf V0, V1, MaskC) --> shuf (bitcast V0), (bitcast V1), MaskC'".

Reapplied with a clang codegen test fix.

Further prep work for #67803
 2024-03-20 15:06:19 +00:00
Freddy Ye
fc0fc768cc [X86] Finally handle target of __builtin_ia32_cmp[p|s][s|d] from avx into sse/sse2/avx (#84136) 
This patch relands #67410 and fixes the cmpfail below:
#include <immintrin.h>
__attribute__((target("avx"))) void test(__m128 a, __m128 b) {
  _mm_cmp_ps(a, b, 14);
}

According to Intel SDM, SSE/SSE2 instructions cmp[p|s][s|d] are
supported when imm8 is in range of [0, 7]
 2024-03-09 13:49:15 +08:00
Fangrui Song
d4cb5d9f2b [X86] Add "Ws" constraint and "p" modifier for symbolic address/label reference (#77886) 
Printing the raw symbol is useful in inline asm (e.g. getting the C++
mangled name, referencing a symbol in a custom way while ensuring it is
not optimized out even if internal). Similar constraints are available
in other targets (e.g. "S" for aarch64/riscv, "Cs" for m68k).

```
namespace ns { extern int var, a[4]; }
void foo() {
  asm(".pushsection .xxx,\"aw\"; .dc.a %p0; .popsection" :: "Ws"(&ns::var));
  asm(".reloc ., BFD_RELOC_NONE, %p0" :: "Ws"(&ns::a[3]));
}
```

Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105576
 2024-01-16 23:57:42 -08:00
Phoebe Wang
8d6e82d501 [X86] Use vXi1 for k constraint in inline asm (#77733) 
Fixes #77172
 2024-01-17 11:40:32 +08:00
Fangrui Song
7e604485e1 [test] Improve x86 inline asm tests 
Reorganize *asm-modifier* and make other cleanups.
 2024-01-11 23:35:46 -08:00
Nikita Popov
158d72d728 [Clang] Set writable and dead_on_unwind attributes on sret arguments (#77116) 
Set the writable and dead_on_unwind attributes for sret arguments. These
indicate that the argument points to writable memory (and it's legal to
introduce spurious writes to it on entry to the function) and that the
argument memory will not be used if the call unwinds.

This enables additional MemCpyOpt/DSE/LICM optimizations.
 2024-01-11 09:46:54 +01:00
Freddy Ye
19870ed9c3 [X86] Emit Warnings for frontend options to enable knl/knm specific ISAs. (#75580) 
Since Knight Landing and Knight Mill microarchitectures are EOL, we
would like to remove intrinsic supports for its specific ISA in LLVM 19.
In LLVM 18, we will first emit a warning for the usage.
 2024-01-09 19:43:14 +08:00
Phoebe Wang
f07aba4bc1 [X86] Add ABI handling for __float128 to match with GCC (#75156) 
Fixes #74601
 2024-01-05 21:53:47 +08:00
Yingwei Zheng
1228becf7d [FuncAttrs] Deduce noundef attributes for return values (#76553) 
This patch deduces `noundef` attributes for return values.
IIUC, a function returns `noundef` values iff all of its return values
are guaranteed not to be `undef` or `poison`.
Definition of `noundef` from LangRef:
```
noundef
This attribute applies to parameters and return values. If the value representation contains any 
undefined or poison bits, the behavior is undefined. Note that this does not refer to padding 
introduced by the type’s storage representation.
```
Alive2: https://alive2.llvm.org/ce/z/g8Eis6

Compile-time impact: http://llvm-compile-time-tracker.com/compare.php?from=30dcc33c4ea3ab50397a7adbe85fe977d4a400bd&to=c5e8738d4bfbf1e97e3f455fded90b791f223d74&stat=instructions:u
|stage1-O3|stage1-ReleaseThinLTO|stage1-ReleaseLTO-g|stage1-O0-g|stage2-O3|stage2-O0-g|stage2-clang|
|--|--|--|--|--|--|--|
|+0.01%|+0.01%|-0.01%|+0.01%|+0.03%|-0.04%|+0.01%|

The motivation of this patch is to reduce the number of `freeze` insts
and enable more optimizations.
 2023-12-31 20:44:48 +08:00
Nikita Popov
a3d2d34e84 [Clang] Use poison as base for vector literals 
When constructing vectors from elements, use poison instead of
undef as the base value. These literals always initialize all
elements (padding the remainder with zero), so that the choice
of base value does not affect semantics.
 2023-12-19 11:53:18 +01:00
Phoebe Wang
f5e48fed04 [X86][AVX10] Allow 64-bit mask register used without EVEX512 (#75571) 
This is to reflect new document change that 64-bit mask is support by
AVX10 256-bit targets.

Latest documents can be found in:
https://cdrdv2.intel.com/v1/dl/getContent/784267
https://cdrdv2.intel.com/v1/dl/getContent/784343
 2023-12-15 20:41:42 +08:00
Brad Smith
357b8b46b1 [Driver] Remove tests for NetBSD 7. No longer supported. 2023-12-01 18:56:22 -05:00
Ramkumar Ramachandra
083a539717 clang/CodeGen/RISCV: test lowering of math builtins (#71399) 
Ever since 98c90a1 (ISel: introduce vector ISD::LRINT, ISD::LLRINT;
custom RISCV lowering) landed, there have been several discussions on
how the lrint and llrint libcalls would lower to LLVM IR via clang on
RV32 and RV64, in an effort to enable vectorization of lrint and llrint
via SLPVectorizer and LoopVectorize. This patch adds a new
math-builtins.c test to the RISC-V target to test the lowering of all
math libcalls, including lrint and llrint.
 2023-11-23 07:39:32 +00:00
Phoebe Wang
e96eddec5e Reland "[X86][AVX10] Fix a bug when using -march with no-evex512 attribute (#72126)" 
Fixes #72106
 2023-11-14 15:39:30 +08:00
Phoebe Wang
17dd0c70c8 Revert "[X86][AVX10] Fix a bug when using -march with no-evex512 attribute (#72126)" 
This reverts commit 451c594bcb.

Revert due to buildbot fails.
 2023-11-14 15:34:38 +08:00
Phoebe Wang
451c594bcb [X86][AVX10] Fix a bug when using -march with no-evex512 attribute (#72126) 
#71318 failed to clear EVEX512 feature for intended intrinsics.

Fixes #72106
 2023-11-14 15:15:34 +08:00
Phoebe Wang
f229ba4e8d [X86][AVX10] Permit AVX512 options/features used together with AVX10 (#71318) 
This patch relaxes the driver logic to permit combinations between
AVX512 and AVX10 options and makes sure we have a unified behavior
between options and features combination.

Here are rules we are following when handle these combinations:
1. evex512 can only be used for avx512xxx options/features. It will be
ignored if used without them;
2. avx512xxx and avx10.xxx are options in two worlds. Avoid to use them
together in any case. It will enable a common super set when they are
used together. E.g., "-mavx512f -mavx10.1-256" euqals "-mavx10.1-512".

Compiler emits warnings when user using combinations like "-mavx512f
-mavx10.1-256" in case they won't get unexpected result silently.

Function target feature attribute follows the same rule now. We have to
add "no-evex512" feature for intrinsics shared between AVX512 and AVX10.
We also add "no-evex512" for early ISAs like AVX etc., because some of
them are called by AVX512 intrinsics.
 2023-11-10 15:21:05 +08:00
Phoebe Wang
cfbf0a500f [X86][RFC] Support AVX10 options (#67278) 
AVX10 Architecture Specification:
https://cdrdv2.intel.com/v1/dl/getContent/784267
AVX10 Technical Paper: https://cdrdv2.intel.com/v1/dl/getContent/784343
RFC:
https://discourse.llvm.org/t/rfc-design-for-avx10-options-support/73672
 2023-10-19 07:52:50 +08:00
Freddy Ye
819ac45d1c [X86] Add USER_MSR instructions. (#68944) 
For more details about this instruction, please refer to the latest ISE
document:
https://www.intel.com/content/www/us/en/develop/download/intel-architecture-instruction-set-extensions-programming-reference.html
 2023-10-16 10:12:53 +08:00
Simon Pilgrim
32a9c09609 [clang][CodeGen] Regenerate tests checks after 94795a37e8 
These were missed as I didn't expect clang codegen to be updated
 2023-10-06 13:27:31 +01:00
Bogdan Graur
821dfc392a Revert "[X86] Change target of __builtin_ia32_cmp[p|s][s|d] from avx into sse/sse2 (#67410)" 
Does not respect `__attribute__((target("avx"))`.

This reverts commit ccd5b8db48.
 2023-10-05 10:33:44 +00:00
Noah Goldstein
2da4960f20 [Inliner] Also propagate noundef and align ret attributes during inlining 
Both of these can potentially be lost otherwise.
 2023-10-03 16:12:19 -05:00
Freddy Ye
ccd5b8db48 [X86] Change target of __builtin_ia32_cmp[p|s][s|d] from avx into sse/sse2 (#67410) 2023-09-27 21:24:22 +08:00
Phoebe Wang
31631d307f [X86][FP16] Add missing handling for FP16 constrained cmp intrinsics (#67400) 2023-09-26 19:27:57 +08:00
Freddy Ye
632d13ce84 [X86] Align other variants to use void * as 512 variants. (#66310) 
For *_stream_* series intrinsics
 2023-09-20 20:59:25 +08:00
Reid Kleckner
c8c075e876 [MS] Follow up fix to pass aligned args to variadic x86_32 functions (#65692) 
MSVC allows users to pass structures with required alignments greater
than 4 to variadic functions. It does not pass them indirectly to
correctly align them. Instead, it passes them directly with the usual 4
byte stack alignment.

This change implements the same logic in clang on the passing side. The
receiving side (va_arg) never implemented any of this indirect logic, so
it doesn't need to be updated.

This issue pre-existed, but @aaron.ballman noticed it when we started
passing structs containing aligned fields indirectly in D152752.
 2023-09-13 16:29:11 -07:00
Dmitri Gribenko
e94e790e46 [clang][test] Don't write temporary (actually, unused) outputs into CWD 2023-09-08 23:54:41 +02:00
Phoebe Wang
24194090e1 [X86][RFC] Add new option -m[no-]evex512 to disable ZMM and 64-bit mask instructions for AVX512 features 
This is an alternative of D157485 and a pre-feature to support AVX10.

AVX10 Architecture Specification: https://cdrdv2.intel.com/v1/dl/getContent/784267
AVX10 Technical Paper: https://cdrdv2.intel.com/v1/dl/getContent/784343
RFC: https://discourse.llvm.org/t/rfc-design-for-avx10-feature-support/72661

Based on the feedbacks from LLVM and GCC community, we have agreed to
start from supporting `-m[no-]evex512` on existing AVX512 features.
The option `-mno-evex512` can be used with `-mavx512xxx` to build
binaries that can run on both legacy AVX512 targets and AVX10-256.

There're still arguments about what's the expected behavior when this
option as well as `-mavx512xxx` used together with `-mavx10.1-256`. We
decided to defer the support of `-mavx10.1` after we made consensus.
Or furthermore, we start from supporting AVX10.2 and not providing any
AVX10.1 options.

Reviewed By: RKSimon, skan

Differential Revision: https://reviews.llvm.org/D159250
 2023-09-08 22:47:22 +08:00
Phoebe Wang
0856efbf88 Revert "[X86][RFC] Add new option -m[no-]evex512 to disable ZMM and 64-bit mask instructions for AVX512 features" 
This reverts commit 7dd48cc24d.

Causing buildbot failure.
 2023-09-07 21:59:01 +08:00
Phoebe Wang
7dd48cc24d [X86][RFC] Add new option -m[no-]evex512 to disable ZMM and 64-bit mask instructions for AVX512 features 
This is an alternative of D157485 and a pre-feature to support AVX10.

AVX10 Architecture Specification: https://cdrdv2.intel.com/v1/dl/getContent/784267
AVX10 Technical Paper: https://cdrdv2.intel.com/v1/dl/getContent/784343
RFC: https://discourse.llvm.org/t/rfc-design-for-avx10-feature-support/72661

Based on the feedbacks from LLVM and GCC community, we have agreed to
start from supporting `-m[no-]evex512` on existing AVX512 features.
The option `-mno-evex512` can be used with `-mavx512xxx` to build
binaries that can run on both legacy AVX512 targets and AVX10-256.

There're still arguments about what's the expected behavior when this
option as well as `-mavx512xxx` used together with `-mavx10.1-256`. We
decided to defer the support of `-mavx10.1` after we made consensus.
Or furthermore, we start from supporting AVX10.2 and not providing any
AVX10.1 options.

Reviewed By: RKSimon, skan

Differential Revision: https://reviews.llvm.org/D159250
 2023-09-07 21:38:35 +08:00
Aaron Ballman
0f1c1be196 [clang] Remove rdar links; NFC 
We have a new policy in place making links to private resources
something we try to avoid in source and test files. Normally, we'd
organically switch to the new policy rather than make a sweeping change
across a project. However, Clang is in a somewhat special circumstance
currently: recently, I've had several new contributors run into rdar
links around test code which their patch was changing the behavior of.
This turns out to be a surprisingly bad experience, especially for
newer folks, for a handful of reasons: not understanding what the link
is and feeling intimidated by it, wondering whether their changes are
actually breaking something important to a downstream in some way,
having to hunt down strangers not involved with the patch to impose on
them for help, accidental pressure from asking for potentially private
IP to be made public, etc. Because folks run into these links entirely
by chance (through fixing bugs or working on new features), there's not
really a set of problematic links to focus on -- all of the links have
basically the same potential for causing these problems. As a result,
this is an omnibus patch to remove all such links.

This was not a mechanical change; it was done by manually searching for
rdar, radar, radr, and other variants to find all the various
problematic links. From there, I tried to retain or reword the
surrounding comments so that we would lose as little context as
possible. However, because most links were just a plain link with no
supporting context, the majority of the changes are simple removals.

Differential Review: https://reviews.llvm.org/D158071
 2023-08-28 12:13:42 -04:00
Freddy Ye
1c154bd755 [X86] Add AVX-VNNI-INT16 instructions. 
For more details about these instructions, please refer to the latest ISE document: https://www.intel.com/content/www/us/en/develop/download/intel-architecture-instruction-set-extensions-programming-reference.html

Reviewed By: pengfei, skan

Differential Revision: https://reviews.llvm.org/D155145
 2023-07-20 14:31:16 +08:00
Freddy Ye
049d6a3f42 [X86] Add SM4 instructions. 
For more details about these instructions, please refer to the latest ISE document: https://www.intel.com/content/www/us/en/develop/download/intel-architecture-instruction-set-extensions-programming-reference.html

Reviewed By: pengfei, skan

Differential Revision: https://reviews.llvm.org/D155148
 2023-07-20 13:35:15 +08:00
Freddy Ye
c6f66de21a [X86] Add SM3 instructions. 
For more details about these instructions, please refer to the latest ISE document: https://www.intel.com/content/www/us/en/develop/download/intel-architecture-instruction-set-extensions-programming-reference.html

Reviewed By: pengfei

Differential Revision: https://reviews.llvm.org/D155147
 2023-07-20 10:24:16 +08:00
Freddy Ye
fc3b7874b6 [X86] Add SHA512 instructions. 
For more details about this instruction, please refer to the latest ISE document: https://www.intel.com/content/www/us/en/develop/download/intel-architecture-instruction-set-extensions-programming-reference.html

Reviewed By: RKSimon, skan

Differential Revision: https://reviews.llvm.org/D155146
 2023-07-20 09:44:44 +08:00
Mehdi Amini
e0ac46e69d Revert "Remove rdar links; NFC" 
This reverts commit d618f1c3b1.
This commit wasn't reviewed ahead of time and significant concerns were
raised immediately after it landed. According to our developer policy
this warrants immediate revert of the commit.

https://llvm.org/docs/DeveloperPolicy.html#patch-reversion-policy

Differential Revision: https://reviews.llvm.org/D155509
 2023-07-17 18:08:04 -07:00
Serge Pavlov
7d6c2e1811 [clang] Use llvm.is_fpclass to implement FP classification functions 
Builtin floating-point number classification functions:

    - __builtin_isnan,
    - __builtin_isinf,
    - __builtin_finite, and
    - __builtin_isnormal

now are implemented using `llvm.is_fpclass`.

This change makes the target callback `TargetCodeGenInfo::testFPKind`
unneeded. It is preserved in this change and should be removed later.

Differential Revision: https://reviews.llvm.org/D112932
 2023-07-11 21:34:53 +07:00
Aaron Ballman
d618f1c3b1 Remove rdar links; NFC 
This removes links to rdar, which is an internal bug tracker that the
community doesn't have visibility into.

See further discussion at:
https://discourse.llvm.org/t/code-review-reminder-about-links-in-code-commit-messages/71847
 2023-07-07 08:41:11 -04:00
Simon Pilgrim
d9634205d9 [Headers][X86] Ensure all AVX broadcast scalar load intrinsics are unaligned 
Similar to the existing _mm_load1_pd/_mm_loaddup_pd and broadcast vector loads, these intrinsic should ensure the loads are unaligned and not assume type alignment

Fixes #62325
 2023-07-03 14:04:50 +01:00
Freddy Ye
3cf2f5c4cd [NFC][X86] Correct tests with wrong locations before. 2023-06-30 14:14:31 +08:00
Reid Kleckner
651e5ae62d [MS] Fix passing aligned records by value in some cases 
It's not exactly clear what the meaning of TypeInfo::AlignRequirement
is, so go directly to the ASTRecordLayout for records and check the
required alignment there. Compare that number with the stack alignment
value of 4.

This fixes cases when the alignment attribute does not appear directly
on the record [1], or when the attribute on the record is underaligned
[2].

[1]: `struct Foo { int __declspec(align(16)) x; };`
[2]: `struct __declspec(align(1)) Bar { int x; };`

Fixes https://llvm.org/pr63257

Differential Revision: https://reviews.llvm.org/D152752
 2023-06-13 12:54:23 -07:00
Noah Goldstein
3391bdc255 Revert "[FunctionAttrs] Propagate some func/arg/ret attributes from caller to callsite (WIP)" 
Accidental commit/push!

This reverts commit 4fa971ff62.
 2023-06-13 00:53:31 -05:00
Noah Goldstein
4fa971ff62 [FunctionAttrs] Propagate some func/arg/ret attributes from caller to callsite (WIP) 
This is the consolidation of D151644 and D151943 moved from
InstCombine to FunctionAttrs. This is based on discussion in the above
patches as well as D152081 (Attributor). This patch was written in a
way so it can have an immediate impact in currently active passes
(FunctionAttrs), but should be easy to port elsewhere (Attributor or
Inliner) if that makes more sense later on.

Some function attributes imply the attribute for all/some instructions
in the function. These attributes can be safely propagated to
callsites within the function that are missing the attribute. This can
be useful when 1) analyzing individual instructions in a function
and 2) if the original caller is later inlined, as if the attributes are
not propagated, they will be lost.

This patch implements propagation in a new class/file
`InferCallsiteAttrs` which can hypothetically be included elsewhere.

At the moment this patch infers the following:

Function Attributes:
    - mustprogress
    - nofree
    - willreturn
    - All memory attributes (readnone, readonly, writeonly, argmem,
      etc...)
        - The memory attributes are only propagated IFF the set of
          pointers available to the callsite is the same as the set
          available outside the caller (i.e no local memory arguments
          from alloca or local malloc like functions).

Argument Attributes:
    - noundef
    - nonnull
    - nofree
    - readnone
    - readonly
    - writeonly
    - nocapture
        - nocapture is only propagated IFF the set of pointers
          available to the callsite is the same as the set available
          outside the caller and its guranteed that between the
          callsite and function return, the state of any capture
          pointers will not change (so the nocaptured gurantee of the
          caller has been met by the instruction preceding the
          callsite and will not changed).

Argument are only propagated to callsite arguments that are also function
arguments, but not derived values.

Return Attributes:
    - noundef
    - nonnull

Return attributes are only propagated if the callsite's return value
is used as the caller's return and execution is guranteed to pass from
callsite to return.

The compile time hit of this for -O3 and -O3+thinLTO is ~[.02, .37]%
regression. Proper LTO, however, has more significant regressions (up
to 3.92%):
https://llvm-compile-time-tracker.com/compare.php?from=94407e1bba9807193afde61c56b6125c0fc0b1d1&to=79feb6e78b818e33ec69abdc58c5f713d691554f&stat=instructions:u

Differential Revision: https://reviews.llvm.org/D152226
 2023-06-13 00:47:43 -05:00
M. Zeeshan Siddiqui
e621757365 [Clang][BFloat16] Upgrade __bf16 to arithmetic type, change mangling, and extend excess precision support 
Pursuant to discussions at
https://discourse.llvm.org/t/rfc-c-23-p1467r9-extended-floating-point-types-and-standard-names/70033/22,
this commit enhances the handling of the __bf16 type in Clang.
- Firstly, it upgrades __bf16 from a storage-only type to an arithmetic
  type.
- Secondly, it changes the mangling of __bf16 to DF16b on all
  architectures except ARM. This change has been made in
  accordance with the finalization of the mangling for the
  std::bfloat16_t type, as discussed at
  https://github.com/itanium-cxx-abi/cxx-abi/pull/147.
- Finally, this commit extends the existing excess precision support to
  the __bf16 type. This applies to hardware architectures that do not
  natively support bfloat16 arithmetic.
Appropriate tests have been added to verify the effects of these
changes and ensure no regressions in other areas of the compiler.

Reviewed By: rjmccall, pengfei, zahiraam

Differential Revision: https://reviews.llvm.org/D150913
 2023-05-27 13:33:50 +08:00
ManuelJBrito
5184dc2d7c [Clang][X86] Change X86 cast intrinsics to use __builtin_nondeterministic_value 
The following intrinsics are currently implemented using a shufflevector with
an undefined mask, this is however incorrect according to intel's semantics for
undefined value which expect an unknown but consistent value.

With __builtin_nondeterministic_value we can now match intel's undefined value.

Differential Revision: https://reviews.llvm.org/D143287
 2023-04-17 12:58:36 +01:00