JDK-8308966 : Add intrinsic for float/double modulo for x86 AVX2 and AVX512
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: compiler
  • Affected Version: 21,22
  • Priority: P4
  • Status: Resolved
  • Resolution: Fixed
  • OS: generic
  • CPU: x86
  • Submitted: 2023-05-26
  • Updated: 2025-04-21
  • Resolved: 2023-06-12
The Version table provides details related to the release that this issue/RFE will be addressed.

Unresolved : Release in which this issue/RFE will be addressed.
Resolved: Release in which this issue/RFE has been resolved.
Fixed : Release in which this issue/RFE has been fixed. The release containing this fix may be available for download as an Early Access Release or a General Availability Release.

To download the current JDK release, click here.
JDK 21 JDK 22
21.0.8-oracleFixed 22 b02Fixed
Related Reports
Causes :  
JDK-8312233 - Performance regression in SharedRuntime::frem/drem() on x86 with AVX2 after JDK-8308966
Causes :  
JDK-8314056 - Remove runtime platform check from frem/drem
Causes :  
JDK-8302191 - Performance degradation for float/double modulo on Linux
Relates :  
JDK-8305948 - Performance degradation for float/double modulo on Linux
Relates :  
JDK-8302191 - Performance degradation for float/double modulo on Linux
Relates :  
JDK-8309636 - Optimize double drem for Blender.java
Relates :  
JDK-8305689 - Consider adding an intrinsic for StrictMath.IEEEremainder
Description
Adding an intrinsic for float/double modulus operations for x86.  This addresses a performance degradation and removes dependence on x87 floating point for platforms that support AVX.
Comments
Fix request [21u] I backport this for parity with 21.0.8-oracle.Together with JDK-8314056 it fixes a regression introduced in 21. Medium risk. Well tested assembler coding, but change to important component. Clean backport. Tests pass. SAP nightly testing passed.
17-04-2025
A pull request was submitted for review. Branch: master URL: https://git.openjdk.org/jdk21u-dev/pull/1668 Date: 2025-04-16 14:28:47 +0000
16-04-2025
This recoups the 3-4% performance seen.
16-08-2023
Changeset: 5d5ae352 Author: Scott Gibbons <sgibbons@openjdk.org> Committer: Sandhya Viswanathan <sviswanathan@openjdk.org> Date: 2023-06-12 15:06:42 +0000 URL: https://git.openjdk.org/jdk/commit/5d5ae35288989fcfabdea013b6e3cdafe359f0df
12-06-2023
A pull request was submitted for review. URL: https://git.openjdk.org/jdk/pull/14224 Date: 2023-05-30 17:07:01 +0000
30-05-2023