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v0.6.4 (2020-09-06)
===================
Fixes:
* build: fix version.h dependencies
* fix and complete the evaluation of atomic builtins
* fix some testcases related to bitfield manipulation
* llvm: fix crash with llvm-11 / use real phi-nodes
* fix: OP_INLINE should not use the function symbol
* fix testing if a OP_CALL's function is pure
* warn on all missing parameter types
* fix init_linearized_builtins()
* fix usage count in linearize_fma()
* linearize: fix a couple of 'selfcheck' warnings
* cfg: remove phi-sources when merging BBs
* cfg: remove phi-nodes when merging BBs
* cfg: add missing REPEAT_CFG_CLEANUP
* fix: rebuild dominance tree during CFG cleanup
* fix: drop qualifiers of casts and comma or statement expressions
* fix kill_insn(OP_SETVAL)
* fix trivial_phi() when the target is before the single value
* memops: fix wrong killing of stores partially dominated by a load
* memops: kill dead loads before phi-node conversion
* memops: kill more dead stores
* fix rem_usage() when the pseudo has a use list but is not PSEUDO_REG
* shut up a silly -Wmaybe-uninitialized warning
* fix add_join_conditional() when one of the alternative is VOID
* asm: fix killing OP_ASM
* asm: fix a test failure on 32-bit systems
* asm: output *memory* operands need their address as *input*
* asm: teach dominates() about OP_ASM
* fix the type in the assignment of 0 to a restricted variable
* fix SSA conversion of mismatched memops
* fix and improve the check that protects try_to_simplify_bb()
* fix remove_merging_phisrc() with duplicated CFG edges.
* fix null-pointer crash with with ident same as one of the attributes
New:
* improve CFG simplification
* teach sparse about -funsigned-bitfields
* add a symbolic checker
* expand __builtin_object_size()
* let plain bitfields default to signed
* add support for __packed struct
* handle qualified anonymous structures
* move check_access() to late_warnings()
* let phi-sources to directly access to their phi-node
* small improvements to the ptrlist API
* warn when taking the address of a built-in function
* handle more graciously labels with no statement
* give an explicit type to compare's operands
* give a type to OP_SYMADDR
* add some notes about pseudos being typeless
* shrink struct basic_block
* pre-proc: strip leading "./" from include paths
* pre-proc: do some path normalization
* linearize __builtin_isdigit()
IR Simplifications:
* simplify: essential OP_ADD & OP_SUB simplifications
* simplify and canonicalize unsigned compares
* simplify: basic unop simplifications
* simplify SEL(SEL(...), ...)
* simplify SEL(x == y, x, y) and friends
* simplify SEL(x, x, x) and SEL(x, 0, x)
* simplify & canonicalize compares
* simplify CBR-CBR on the same condition
* simplify unrestricted postop
* simplification of computed gotos with 1 or 2 targets
* simplify kill_insn() of unops and unop-ish instructions
* simplify: put PSEUDO_ARGS and PSEUDO_REGs in canonical order too
* simplify (~x {&,|,^} x) --> {0,~0,~0}
* simplify ((x cmp y) {&,|,^} (x !cmp y)) --> {0,1,1}
* simplify LSR + SEXT into ASR
* simplify and canonicalize signed compares
* simplify CMP(AND(x,M), C) and CMP(OR(x,M), C)
* simplify AND(x >= 0, x < C) --> (unsigned)x < C
* simplify TRUNC(x) {==,!=} C --> AND(x,M) {==,!=} C
* simplify of TRUNC(NOT(x)) --> NOT(TRUNC(x))
* factorize (x OP1 z) OP2 (y OP1 z) into (x OP2 y) OP1 z
* factorize SHIFT(x, s) OP SHIFT(y, s) into SHIFT((x OP y), s)
* factorize SEL(x, OP(y,z), y) into OP(SEL(x, z, 0), y)
* convert SEL(x & BIT1, BIT2, 0) into SHIFT(x & BIT1, S)
* canonicalize ((x & M) == M) --> ((x & M) != 0) when M is a power-of-2
Testsuite:
* testsuite: add new tags: check-output-{match,returns}
* testsuite: fix parsing of tags used in the testcases
* testsuite: add option '-r' to 'test-suite format'
Documentation:
* doc: fix: Sphinx's option ':noindex:' renamed into ':noindexentry:'
* doc: fix extracted autodoc when short description ends with a '?'
* doc: add some doc about using NULL or VOID in pointer lists
* doc: add some doc to flowgraph.h
* doc: extract doc related to simplification
Cleanups:
* slice: small reorg of OP_SLICE in preparation for some incoming changes
* cleanup: removed an unused parameter for show_symbol_list()
* cleanup linearize_cond_branch()
* cleanup: remove unneeded REPEAT_SYMBOL_CLEANUP
* cleanup: no needs to use MARK_CURRENT_DELETED() for multi-jumps
* linearize: remove unneeded forward declarations
* linearize: only allocate call instructions when needed
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