[NFC] Move llvm.fptrunc.round to Floating-Point Conversion Intrinsics class #155854
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Not sure if https://llvm.org/docs/LangRef.html#standard-c-c-library-intrinsics is a perfect match, but the intrinsic shouldn't be a part of https://llvm.org/docs/LangRef.html#preserving-debug-information-intrinsics Signed-off-by: Sidorov, Dmitry <[email protected]>
Member
|
@llvm/pr-subscribers-llvm-ir Author: Dmitry Sidorov (MrSidims) ChangesNot sure if Full diff: https://github.com/llvm/llvm-project/pull/155854.diff 1 Files Affected:
diff --git a/llvm/docs/LangRef.rst b/llvm/docs/LangRef.rst
index b122fd352eaf5..cbf5489f2a215 100644
--- a/llvm/docs/LangRef.rst
+++ b/llvm/docs/LangRef.rst
@@ -17780,6 +17780,46 @@ would, but without setting errno. If the rounded value is too large to
be stored in the result type, the return value is a non-deterministic
value (equivalent to `freeze poison`).
+'``llvm.fptrunc.round``' Intrinsic
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Syntax:
+"""""""
+
+::
+
+ declare <ty2>
+ @llvm.fptrunc.round(<type> <value>, metadata <rounding mode>)
+
+Overview:
+"""""""""
+
+The '``llvm.fptrunc.round``' intrinsic truncates
+:ref:`floating-point <t_floating>` ``value`` to type ``ty2``
+with a specified rounding mode.
+
+Arguments:
+""""""""""
+
+The '``llvm.fptrunc.round``' intrinsic takes a :ref:`floating-point
+<t_floating>` value to cast and a :ref:`floating-point <t_floating>` type
+to cast it to. This argument must be larger in size than the result.
+
+The second argument specifies the rounding mode as described in the constrained
+intrinsics section.
+For this intrinsic, the "round.dynamic" mode is not supported.
+
+Semantics:
+""""""""""
+
+The '``llvm.fptrunc.round``' intrinsic casts a ``value`` from a larger
+:ref:`floating-point <t_floating>` type to a smaller :ref:`floating-point
+<t_floating>` type.
+This intrinsic is assumed to execute in the default :ref:`floating-point
+environment <floatenv>` *except* for the rounding mode.
+This intrinsic is not supported on all targets. Some targets may not support
+all rounding modes.
+
Bit Manipulation Intrinsics
---------------------------
@@ -31123,42 +31163,3 @@ Semantics:
The '``llvm.preserve.struct.access.index``' intrinsic produces the same result
as a getelementptr with base ``base`` and access operands ``{0, gep_index}``.
-'``llvm.fptrunc.round``' Intrinsic
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-
-Syntax:
-"""""""
-
-::
-
- declare <ty2>
- @llvm.fptrunc.round(<type> <value>, metadata <rounding mode>)
-
-Overview:
-"""""""""
-
-The '``llvm.fptrunc.round``' intrinsic truncates
-:ref:`floating-point <t_floating>` ``value`` to type ``ty2``
-with a specified rounding mode.
-
-Arguments:
-""""""""""
-
-The '``llvm.fptrunc.round``' intrinsic takes a :ref:`floating-point
-<t_floating>` value to cast and a :ref:`floating-point <t_floating>` type
-to cast it to. This argument must be larger in size than the result.
-
-The second argument specifies the rounding mode as described in the constrained
-intrinsics section.
-For this intrinsic, the "round.dynamic" mode is not supported.
-
-Semantics:
-""""""""""
-
-The '``llvm.fptrunc.round``' intrinsic casts a ``value`` from a larger
-:ref:`floating-point <t_floating>` type to a smaller :ref:`floating-point
-<t_floating>` type.
-This intrinsic is assumed to execute in the default :ref:`floating-point
-environment <floatenv>` *except* for the rounding mode.
-This intrinsic is not supported on all targets. Some targets may not support
-all rounding modes.
|
Contributor
Author
|
@arsenm please take a look |
arsenm
approved these changes
Aug 29, 2025
Contributor
|
It kind of doesn't fit into any of the intrinsic category names used, probably should be a new one |
Contributor
|
Maybe move under https://llvm.org/docs/LangRef.html#general-intrinsics |
Contributor
Author
|
Apologies, completely forgot about the PR. @arsenm I'm keen to add a new class of intrinsics. Anyway I need it for https://discourse.llvm.org/t/rfc-spir-v-way-to-represent-float8-in-llvm-ir/87758 . WDYT about the current definition? |
arsenm
approved these changes
Sep 8, 2025
MrSidims
changed the title
Collaborator
|
LLVM Buildbot has detected a new failure on builder Full details are available at: https://lab.llvm.org/buildbot/#/builders/51/builds/23039 Here is the relevant piece of the build log for the reference |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
4 participants
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Floating-Point Conversion Intrinsics - is a new category of intrinsics, that do not fall into other categories and can be used for conversions with explicit rounding modes and mini-floats conversions.