Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: 1c91665ec948f498eab32a5662143ac9affd10f7
https://github.com/WebKit/WebKit/commit/1c91665ec948f498eab32a5662143ac9affd10f7
Author: Fady Farag <[email protected]>
Date: 2026-09-01 (Tue, 01 Sep 2026)
Changed paths:
M Source/JavaScriptCore/offlineasm/arm64.rb
M Source/JavaScriptCore/offlineasm/risc.rb
Log Message:
-----------
[JSC] offlineasm: emit tbz/tbnz for single-bit test branches on ARM64
https://bugs.webkit.org/show_bug.cgi?id=322779
rdar://186041838
Reviewed by Keith Miller.
riscLowerTest lowers every masked test-and-branch:
btpnz t0, 8, .foo
into an and into a temporary followed by a compare-and-branch on it:
and x13, x0, #8
cbnz x13, .foo
When the mask is a single bit, ARM64 has an instruction for exactly this:
tbnz x0, #3, .foo
Only local-label targets are folded.
* Source/JavaScriptCore/offlineasm/arm64.rb:
* Source/JavaScriptCore/offlineasm/risc.rb:
Canonical link: https://commits.webkit.org/320266@main
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