Landing: f7a08d53ab30

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Project / Subsystem

gcc / x86

Date

2026-04-30

Author

H.J. Lu

Commit

f7a08d53ab3074d1661d74a438932da6ed4879cc

Source

github

Perf win

Yes

Breaking

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project: gcc
subsystem: x86
patch_id: —
commit_hash: f7a08d53ab3074d1661d74a438932da6ed4879cc
source_type: github
headline: x86: Disable 16-bit immediate stores when TARGET_LCP_STALL is enabled
tldr: Avoid 16-bit immediate integer store when TARGET_LCP_STALL is enabled.
author: H.J. Lu
outcome: committed
performance_win: true
breaking_change: false
series_id: —
series_parts: []
tags: • x86
• optimization
• performance
• instruction selection
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/f7a08d53ab3074d1661d74a438932da6ed4879cc
date: 2026-04-30T00:00:00.000Z

This commit disables 16-bit immediate integer stores when TARGET_LCP_STALL is enabled in GCC’s x86 backend. The change avoids performance stalls on certain x86 processors. By updating the V_16_32_64:*mov<mode>_imm pattern, the compiler now avoids generating 16-bit immediate stores when TARGET_LCP_STALL is active, potentially improving performance on affected CPUs.