X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=BUGS;h=0902dfd5dbbf80873bb1fc3d520814eca1d1c6a2;hb=b68b6c67c462e90775118cd66a6fb8b55afb2d8c;hp=0ec868ec0b0dde0ceb93a7ee9acf8e581d9910a3;hpb=e119a2f79cf36039a39996f5490934b4d927529a;p=sbcl.git diff --git a/BUGS b/BUGS index 0ec868e..0902dfd 100644 --- a/BUGS +++ b/BUGS @@ -556,11 +556,6 @@ WORKAROUND: c. The cross-compiler cannot inline functions defined in a non-null lexical environment. -206: ":SB-FLUID feature broken" - (reported by Antonio Martinez-Shotton sbcl-devel 2002-10-07) - Enabling :SB-FLUID in the target-features list in sbcl-0.7.8 breaks - the build. - 207: "poorly distributed SXHASH results for compound data" SBCL's SXHASH could probably try a little harder. ANSI: "the intent is that an implementation should make a good-faith @@ -1810,7 +1805,8 @@ WORKAROUND: 419: stack-allocated indirect closure variables are not popped - (locally (declare (optimize speed (safety 0))) + (locally (declare (optimize sb-c::stack-allocate-dynamic-extent + sb-c::stack-allocate-value-cells)) (defun bug419 (x) (multiple-value-call #'list (eval '(values 1 2 3)) @@ -1823,54 +1819,13 @@ WORKAROUND: (declare (dynamic-extent #'mget #'mset)) ((lambda (f g) (eval `(progn ,f ,g (values 4 5 6)))) #'mget #'mset)))))) - (ASSERT (EQUAL (BUG419) '(1 2 3 4 5 6))) => failure - -420: The MISC.556 test from gcl/ansi-tests/misc.lsp fails hard. - -In sbcl-1.0.13 on Linux/x86, executing - (FUNCALL - (COMPILE NIL - '(LAMBDA (P1 P2) - (DECLARE - (OPTIMIZE (SPEED 1) (SAFETY 0) (DEBUG 0) (SPACE 0)) - (TYPE (MEMBER 8174.8604) P1) (TYPE (MEMBER -95195347) P2)) - (FLOOR P1 P2))) - 8174.8604 -95195347) -interactively causes - SB-SYS:MEMORY-FAULT-ERROR: Unhandled memory fault at #x8. -The gcl/ansi-tests/doit.lisp program terminates prematurely shortly after -MISC.556 by falling into gdb with - fatal error encountered in SBCL pid 2827: Unhandled SIGILL -unless the MISC.556 test is commented out. - -Analysis: + and a number of other arithmetic functions exhibit the -same behaviour. Here's the underlying problem: On x86 we perform -single-float + integer normally using double-precision, and then -coerce the result back to single-float. (The FILD instruction always -gives us a double-float, and unless we do MOVE-FROM-SINGLE it remains -one. Or so it seems to me, and that would also explain the observed -behaviour below.) - -During IR1 we derive the types for both - - (+ ) ; uses double-precision - (+ (FLOAT )) ; uses single-precision - -and get a mismatch for a number of unlucky arguments. This leads to -derived result type NIL, and ends up flushing the whole whole -operation -- and finally we generate code without a return sequence, -and fall through to whatever. - -The use of double-precision in the first case appears to be an -(un)happy accident -- interval arithmetic gives us the -double-precision result because that's what the backend does. - - (+ 8172.0 (coerce -95195347 'single-float)) ; => -9.518717e7 - (+ 8172.0 -95195347) ; => -9.5187176e7 - (coerce (+ 8172.0 (coerce -95195347 'double-float)) 'single-float) - ; => -9.5187176e7 - -Which should be fixed, the IR1, or the backend? + (ASSERT (EQUAL (BUG419 42) '(1 2 3 4 5 6))) => failure + + Note: as of SBCL 1.0.26.29 this bug no longer affects user code, as + SB-C::STACK-ALLOCATE-VALUE-CELLS needs to be explicitly turned on for + that to happen. Proper fix for this bug requires (Nikodemus thinks) + storing the relevant LAMBDA-VARs in a :DYNAMIC-EXTENT cleanup, and + teaching stack analysis how to deal with them. 421: READ-CHAR-NO-HANG misbehaviour on Windows Console: @@ -1927,3 +1882,41 @@ generally try to check returns in safe code, so we should here too.) The problem is with the fast path using ansi-stream-cin-buffer not hitting closed-flame. + +426: inlining failure involving multiple nested calls + + (declaim (inline foo)) + (defun foo (x y) + (cons x y)) + (defun bar (x) + (foo (foo x x) (foo x x))) + ;; shows a full call to FOO + (disassemble 'bar) + ;; simple way to test this programmatically + (let ((code (sb-c::fun-code-header #'bar)) + (foo (sb-impl::fdefinition-object 'foo nil))) + (loop for i from sb-vm:code-constants-offset below (sb-kernel:get-header-data code) + do (assert (not (eq foo (sb-kernel:code-header-ref code i)))))) + + This appears to be an ancient bug, inherited from CMUCL: reportedly + 18c does the same thing. RECOGNIZE-KNOWN-CALL correctly picks up only + one of the calls, but local call analysis fails to inline the call + for the second time. Nikodemus thinks (but is not 100% sure based on + very brief investigation) that the call that is not inlined is the + second nested one. A trivial fix is to call CHANGE-REF-LEAF in known + call for functions already inline converted there, but he is not sure + if this has adverse effects elsewhere. + +427: ANY-REG not good for primitive type T + + ...which is true, of course, but the following should not complain + about it (on x86 and x86-64): + + (sb-alien:with-alien ((buf (array (sb-alien:signed 8) 16)))) + + reported by Stelian Ionescu on sbcl-devel. + +428: TIMER SCHEDULE-STRESS in timer.impure.lisp fails + + Failure modes vary. Core problem seems to be (?) recursive entry to + RUN-EXPIRED-TIMERS.