Planet SBCL Archives - August, 2026

August, 2026

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August, 2026

1st

Don't break M-. by manipulating *features* at compile-time - SBCL Commits
Don't break M-. by manipulating *features* at compile-time, actually - SBCL Commits
Fix do-conset-elements for big-endian - SBCL Commits
Remove questionable profiling result - SBCL Commits

2nd

sb-simd: support for load/store to and from SAPs - SBCL Commits
sb-simd: Implement vector sap-ref for arm64 - SBCL Commits
sb-simd: separate x86-64 and arm64 things - SBCL Commits

3rd

Fix file-position on copmosite streams - SBCL Commits
Fix a test - SBCL Commits
Fix a test on windows - SBCL Commits

4th

Perform local common subexpression elimination for some memory loads - SBCL Commits
Skip common subexpr elim for lambda enclosed in a let - SBCL Commits
functional-kind can't be zombie and let at the same time - SBCL Commits
Return NIL from ok-to-flush for potentially trapping special refs - SBCL Commits
[2162824] patch: Rewrite (zerop (ldb ...)) and (zerop (logand ...)) - Launchpad Bugs
Improve the (zerop (ldb ..)) transform - SBCL Commits
Rewrite (zerop (ldb ...)) as (zerop (logand ...)) - SBCL Commits
Avoid creating bignums for (zerop (mask-field ...)) - SBCL Commits
Disable CSE logic - SBCL Commits

5th

x86-64: sign-extend logand constants to make them encodable - SBCL Commits
Add sb-vm:%atomic-exchange - SBCL Commits
[2162932] Stacktrace gives incorrect information on complex double float when input type is declared - Launchpad Bugs
ppc, ppc64: add %raw-instance-cas/signed-word - SBCL Commits
x86-64: fix debugger access to stack complex double-floats - SBCL Commits

6th

Guard a thing with backend-subfeatures - SBCL Commits
Fix a test - SBCL Commits
Use correct test for a slot that can hold fixnum - SBCL Commits
read-sequence: don't test for lists first - SBCL Commits
[2162990] Recent commit has introduced scope bugs around blocks, return-from & tagbody - Launchpad Bugs

7th

Change how file-position works on variable encodings - SBCL Commits
Declare that unread-char returns nil - SBCL Commits
[2163043] failed AVER: (FUNCTIONAL-LETLIKE-P FUN) - Launchpad Bugs
Remove ansi-stream-csize-buffer - SBCL Commits
Move some code to the caller of external-format-char-size - SBCL Commits
Fix file-position when ansi-stream-in-buffer is used - SBCL Commits
Propagate local call argument types optimistically as well. - SBCL Commits
read-byte transform: refill the buffer instead of just calling n-bin - SBCL Commits
assignment-convert: Don't try to be so smart with cleanups. - SBCL Commits

8th

arm64: full unicode encoding in character-string-to-utf8 - SBCL Commits
Remove debugging and unused code - SBCL Commits
Silence one more compiler-note from bignum - SBCL Commits
arm64, character-string-to-utf8: faster newline tracking - SBCL Commits
arm64: add sqshrn instructions - SBCL Commits
arm64, character-string-to-utf8: delay newline tracking - SBCL Commits
Add a test for character-string-to-utf8 - SBCL Commits
Don't produce a compile time warning for (setf (char string 0) #\Ã©) - SBCL Commits

10th

arm64 utf8-strlen: test for null and non-ascii at the same time - SBCL Commits
arm64-simd: use a helper function more - SBCL Commits
assignment-convert: Handle tail calls and cleanups better (again). - SBCL Commits
Silence some output of make-target-2 if --noinform was given - SBCL Commits
Speed up arm64/character-string-utf8-length - SBCL Commits
x86-64/character-string-utf8-length: don't repeat the same instruction - SBCL Commits
x86-64/character-string-utf8-length: support very large strings - SBCL Commits
Constrain local call parameters from their arguments. - SBCL Commits
Have CTU:COMPILER-DERIVED-TYPE return the final dervied type. - SBCL Commits
Infer local call argument types from how the arguments step. - SBCL Commits
Restore test case. - SBCL Commits
Make some prose less bad. - SBCL Commits

11th

arm64: encode simd scalar add, sub, and vector/scalar neg - SBCL Commits
character-string-utf8-length: speed up surrogates tests - SBCL Commits
arm64/character-string-to-utf8: slightly faster surrogate check - SBCL Commits
Fix specialized XEPs with ignored parameters, again - SBCL Commits
arm64/character-string-to-utf8: do not exit early on surrogates - SBCL Commits
Add a way to jump to lisp code tags from inline-vop - SBCL Commits
ppc-vm: context-float-register is implemented on freebsd - SBCL Commits
arm64/utf8-strlen: remove redundant instructions - SBCL Commits
Copy the changes from utf8-strlen to utf8-to-character-string - SBCL Commits
fix movdqu64 in move for avx512 + test warning - SBCL Commits
Remove duplicate primtype definition for simd-pack-512 - SBCL Commits

12th

x86-64: full unicode encoding in simd character-string-to-utf8 - SBCL Commits
x86-64: full unicode decoding in utf8-to-character-string-avx2 - SBCL Commits
arm64-simd: streamline start/end calculations - SBCL Commits
#+sb-unicode - SBCL Commits
utf8-to-character-string-avx2: smaller 8-to-32 widening - SBCL Commits
utf8-to-character-string-avx2: free up a register using vpmaddubsw - SBCL Commits
More optimizations in utf8-to-character-string-avx2 - SBCL Commits
Remove effectless case - SBCL Commits
Ensure that hash-table-index-vector stays with the table - SBCL Commits
character-string-to-utf8-avx2: free up a register - SBCL Commits
x86-64: encode lddqu - SBCL Commits

13th

x86-64-simd: improve crlf detection - SBCL Commits
build-all-cores - SBCL Commits
Remove some special vars from DEFCLASS parser - SBCL Commits
Remove an extra vzeroupper - SBCL Commits
Appease cmucl - SBCL Commits
Fix bug in selecting kregister in avx512-insts.lisp - SBCL Commits
Recognize the pattern (if (member x `(,this ,that)) ...) - SBCL Commits
character-string-to-utf8-avx2: reduce memory loads - SBCL Commits
utf8-simd: reduce tagging/untagging for arguments/results - SBCL Commits
Decrease some repetition - SBCL Commits

14th

Add some (safety 0) - SBCL Commits
Improve codegen for chain of structure-TYPEP tests - SBCL Commits
constraint: Inherit EQL var constraints from local calls as well. - SBCL Commits
Delete unused function. - SBCL Commits
character-string-to-utf8-avx2: shrink the lookup table - SBCL Commits
arm64/character-string-to-utf8: use a lookup table for sizes - SBCL Commits
[2163502] Incorrect type error in compiled code - Launchpad Bugs
Use zeroize - SBCL Commits
Stop reusing potentially optimized inlined functions - SBCL Commits
arm64: fix fast-logand-c/unsigned=>unsigned - SBCL Commits

15th

arm64/character-string-to-utf8: reduce a LUT by 4KB - SBCL Commits
arm64/character-string-to-utf8: don't use a lookup table for sizes - SBCL Commits
avx2/character-string-to-utf8: reduce a LUT by 4KB - SBCL Commits
arm64/character-string-to-utf8: reduce GPR calculations - SBCL Commits
ffi.texinfo: struct by value is supported on Windows - SBCL Commits
fix ffi documentation at the source - SBCL Commits
avx2/character-string-to-utf8: don't use a lookup table for sizes - SBCL Commits
avx2/character-string-to-utf8: simplify calculations - SBCL Commits

16th

Prevent var substitution with lvar-type-annotations - SBCL Commits
Delete 6-year-old TODO - SBCL Commits

17th

Remove some nops for ancient MIPS I support - SBCL Commits
avx2/character-string-to-utf8: optimize newline tracking - SBCL Commits
Factor out boilerplate from structure-is-a - SBCL Commits
Fix typo - SBCL Commits
Use a smaller instruction - SBCL Commits
Replace two instructions with one - SBCL Commits
Fix ldb transforms - SBCL Commits
Assign layout-ids just-in-time as originally intended - SBCL Commits

18th

Never transform ELT to NTH - SBCL Commits
Don't stop compilation on bad type declarations - SBCL Commits
arm64/utf8-sap-to-character-string: add a 1/2-byte fast path - SBCL Commits

19th

Rearrange branches - SBCL Commits
arm64/utf8-to-string: return to the fast path from the full loop - SBCL Commits
read-line: faster return if #\Newline is in the buffer - SBCL Commits
Enable most of clos.impure for --evaluator-mode interpret - SBCL Commits
Prefer not to use #+#. in tests - SBCL Commits
Remove #+#. from x86-64 files - SBCL Commits
x86[-64]: Invent syntactic convenience in define-assembly-routine - SBCL Commits

20th

Preemptively adjust a test - SBCL Commits
Basic support for AVX512 mask registers - SBCL Commits
clos.impure passes on sb-eval too - SBCL Commits
Remove mappings from float-regs to offsets - SBCL Commits
Copying error - SBCL Commits
decode-universal-time: don't do mod and truncate separately - SBCL Commits
(- a (- a b)) => b - SBCL Commits
x86-64: rename xmm-tn-p to float-tn-p - SBCL Commits
avx2/utf8-to-character-string: add a 1/2-byte fast path - SBCL Commits

21st

EVEX: add V' and improve 5-bit register decoding - SBCL Commits
add infrastructure for EVEX compressed displacement - SBCL Commits
Remove non-ascii characters from sources - SBCL Commits
x86-64-simd: use helper functions throughout - SBCL Commits
Incomplete previous diff - SBCL Commits
build-all-cores - SBCL Commits
Make EMIT-EA more complicated - SBCL Commits

22nd

arm64/character-string-to-utf8: add a fast-path for 1-2 bytes - SBCL Commits
Move an instruction. - SBCL Commits
arm64/character-string-to-utf8: escape back to ascii-loop - SBCL Commits
Apply various micro-optimizations to VECTOR-FILL/T - SBCL Commits
arm64/character-string-to-utf8: jump to ascii-loop from a better place - SBCL Commits
x86-64: Permute Lisp arg-passing registers - SBCL Commits
Augment genesis/number-types.h, don't make more headers - SBCL Commits

23rd

[2164857] Potential GC bug - Launchpad Bugs
Improve utf-8 tests - SBCL Commits
Add a folder stub for reverse-values-list - SBCL Commits

24th

avx2/utf8-strlen: fix the 1/2 byte fast path - SBCL Commits
Remove defknowns for removed functions - SBCL Commits
[2164924] Error when printing a SB-IMPL:OCTETS-ENCODING-ERROR object - Launchpad Bugs
Correctly signal encoding errors from string-to-octets - SBCL Commits

25th

Add an assertion - SBCL Commits
[2164994] Can not build sbcl on Linux x86_64 with processor with no avx* - Launchpad Bugs
Stop touching avx512 registers in c-call - SBCL Commits
arm64: fix %make-simd-pack-double/single - SBCL Commits
Fix %make-simd-pack-512-single - SBCL Commits
Fix avx-512 register allocation - SBCL Commits
Remove debug output - SBCL Commits
Save avx-512 registers around foreign calls - SBCL Commits
Don't save avx512 registers in alloc tramps - SBCL Commits
Fix avx512 instruction encoding for ymm16-31 - SBCL Commits

26th

Fix disassembler - SBCL Commits
Reset dstate-disp-n to 0 - SBCL Commits
Disassemble more avx512 instructions - SBCL Commits
Fix emit-avx512-inst-imm - SBCL Commits
Add a test for foldable functions without a runtime function - SBCL Commits
Protect a test with #+ - SBCL Commits
Remove dstate-disp-n - SBCL Commits
build-all-cores - SBCL Commits
Draft NEWS for sbcl-2.6.8 - SBCL Commits
Adjust NEWS - SBCL Commits

27th

Adjust NEWS - SBCL Commits
Fix a C style warning - SBCL Commits
[2165426] arch_scrub_control_stack on x86-64 is deficient - Launchpad Bugs

28th

2.6.8: will be tagged as "sbcl-2.6.8" - SBCL Commits
[2165787] sb-manual is causing problems on windows with symlinks - Launchpad Bugs
(reverse (list a b c)) => (list c b a) - SBCL Commits
sb-simd: Fix a bunch of bugs - SBCL Commits
Allow (setf (slot-value x 'read-only-struct-slot)) at compile-time - SBCL Commits
Replace mem-reg XADD with load+add+store - SBCL Commits
Remove R/M/W memory operation from alloc-alien-stack-space - SBCL Commits
Remove clc instructions that do nothing - SBCL Commits
x86-64: Disallow :full-call as an asm routine return style - SBCL Commits

29th

Output lisp-readable list of cold function addresses - SBCL Commits
Slightly more compact debug register encoding - SBCL Commits
debug-dump: don't store var symbol packages twice - SBCL Commits
debug-dump: store package-ids - SBCL Commits
dump-1-packed-dfun: match what compute-args returns - SBCL Commits
Remove fast-read-var-u-integer - SBCL Commits
- debugging code - SBCL Commits
build-all-cores - SBCL Commits
Facilitate making array of lispobj fields in struct thread - SBCL Commits
[2165823] SBCL 2.6.7 did not work out of the box on MIPS32 Gentoo Linux (SGI Octane) (include fix) - Launchpad Bugs
sub-access-debug-var-slot: use mask-signed-field - SBCL Commits
arm64/simd-pack: use stp during allocation - SBCL Commits
arm64: store to the untagged pointer after allocation - SBCL Commits
Remove a symbol-macrolet - SBCL Commits
Remove comment rendered obsolete by rev 0f08e80e - SBCL Commits
x86-64: use test x, x instead of bt more often - SBCL Commits
x86-64, arm64: use tst instead of cmp if it can use immediates - SBCL Commits
Don't issue bt instead of cmp x, imm - SBCL Commits
[2165835] array dimension returns wrong result - Launchpad Bugs
Don't specify :result-arg for REVERSE - SBCL Commits
Don't dx the list in (dx-let ((a (list a b))) (reverse a)) - SBCL Commits

30th

(aref (vector a) 0) => a - SBCL Commits
More thorough tracking of macro argument modifications - SBCL Commits
More constant tracking for destructive modification detection - SBCL Commits
Resolve an improper use of functional-kind - SBCL Commits
Distinguish between full and partial constant pass-through - SBCL Commits
Disable a test - SBCL Commits
De-obfuscate a loop - SBCL Commits
arm64: better complex-float-= - SBCL Commits
arm64: use zip1 for creating complex floats - SBCL Commits
expt: use (= (ftruncate n) n) to check for integers - SBCL Commits
arm64: more optimizable integer-length - SBCL Commits
More partial result modification false positives - SBCL Commits
Don't define a no-op splat as a VOP - SBCL Commits
arm64: use a flagged :conditional %digit-0-or-plusp VOP - SBCL Commits
Don't define very large simd-pack functions for printing - SBCL Commits
build-all-cores - SBCL Commits
More compact fop-simd-pack - SBCL Commits
x86-64: Implement "possible win" cited in calling-convention.texinfo - SBCL Commits
Enable a crossbuild test of :tls-based-mv-return - SBCL Commits
More ratio arithmetic shortcuts - SBCL Commits
Reduce DISPATCH-RATIO expansion size - SBCL Commits

31st

Better return value tn movement with #+tls-based-mv-return - SBCL Commits
#+tls-based-mv-return return: don't write RCX before it's needed - SBCL Commits
Resolve a GC issue with #+tls-based-mv-return - SBCL Commits
sb-manual: don't use version controlled symlinks - SBCL Commits
Fix interrupt-thread for #+tls-based-mv-return - SBCL Commits
Forgot a DX - SBCL Commits
Redo a test without using threads - SBCL Commits
Try more values in mv-return.impure - SBCL Commits
with-interrupt-bindings: mv-count is a fixnum - SBCL Commits