Landing: 729f9243623f

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Project / Subsystem

gcc / gcc/x86

Date

2026-08-20

Author

H.J. Lu

Commit

729f9243623fb020b3e119f5e5911e99f75375ec

Source

github

Perf win

Breaking

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All attributes

project: gcc
subsystem: gcc/x86
patch_id: —
commit_hash: 729f9243623fb020b3e119f5e5911e99f75375ec
source_type: github
headline: widen_mult_high_chain.c: Scan both mulq and mulx for BMI2
tldr: gcc: Testsuite updated to scan both mulq and mulx in widen_mult_high_chain.c when BMI2 is enabled.
author: H.J. Lu
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • gcc
• x86
• testsuite
• bmi2
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/729f9243623fb020b3e119f5e5911e99f75375ec
date: 2026-08-20T00:00:00.000Z

The testsuite file widen_mult_high_chain.c has been updated to scan for both mulq and mulx instructions. This change is necessary because when the BMI2 (Bit Manipulation Instructions 2) extension is enabled by default, both instructions can be generated by the compiler.