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dbgloc line [col]
This is implemented in a backwards-compatible manner.
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See previous discussion here[1]. It's unclear to me how to preview HTML page
generated from the .txt file, though.
[1]: https://lists.sr.ht/~mpu/qbe/%3C87cz1jq26k.fsf%40greenfork.me%3E
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Causes errors with stock toolchain
on OpenBSD.
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this fixes the build on FreeBSD, where the value of $(CC) recently
changed from "cc" (13.2) to "c99" (14).
Signed-off-by: Lorenz (xha) <me@xha.li>
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signed int can't represent all the values of unsigned int, so we
need to do the conversion to signed long, and use the lower 32 bits
as the result.
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Support "file" and "loc" directives. "file" takes a string (a file name)
assigns it a number, sets the current file to that number and records
the string for later. "loc" takes a single number and outputs location
information with a reference to the current file.
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We now treat thread-local
symbols in Mems properly.
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Non-store/load instructions were
not lowered correctly for thread-
local symbols. This is an attempt
at a fix (cannot test for now).
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Thanks to Lassi Pulkkinen for
flagging the issue and pointing
me to Ulrich Drepper's extensive
doc [1].
[1] https://people.redhat.com/drepper/tls.pdf
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This is consistent with newtmp()
and newcon().
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During coalescing, the resizing/
reordering of the sl[] array
invalidates the indices stored
in the 'visit' field of temps;
we need to reset it before we
can use it again.
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To match x86
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This is necessary because, post
fusion, dead stores may clobber
data. A new test case exposes
one such situation.
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Crashing loads of uninitialized memory
proved to be a problem when implementing
unions using qbe. This patch introduces
a new UNDEF Ref to represent data that is
known to be uninitialized. Optimization
passes can make use of it to eliminate
some code. In the last compilation stages,
UNDEF is treated as the constant 0xdeaddead.
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When checking if two slices represent
the same range of memory we must check
that offsets match.
The bug was revealed by a harec test.
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When multiple stack slots are coalesced
one 'alloc' instruction is kept in the il
and the other ones are removed and have
their uses replaced by the result of the
selected one. To produce valid ssa, it
must be ensured that the uses that get
replaced are dominated by the selected
'alloc' instruction. This patch ensures
dominance by moving the selected alloc up
in the start block as necessary.
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We may well treat all rets as
non-escaping since stack slots
are destroyed upon funcion
return.
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The .val field is signed in RSlot.
Add a new dedicated function to
fetch it as a signed int.
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Some noisy assemblers complain
when asked to do it themselves.
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It is handy to express when
the end of a block cannot be
reached. If a hlt terminator
is executed, it traps the
program.
We don't go the llvm way and
specify execution semantics as
undefined behavior.
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Symbols are a useful abstraction
that occurs in both Con and Alias.
In this patch they get their own
struct. This new struct packages
a symbol name and a type; the type
tells us where the symbol name
must be interpreted (currently, in
gobal memory or in thread-local
storage).
The refactor fixed a bug in
addcon(), proving the value of
packaging symbol names with their
type.
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When we process one block, we
start by allocating registers
for all the temporaries live
at the exit of the block.
Before this patch we processed
temps first, then in doblk() we
would mark globally live registers
allocated. This meant that temps
could get wrongly assigned a live
register.
The fix is simple: we now process
registers first at block exits,
then allocate temps.
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The copy elimination pass is not
complete. This patch improves
things a bit, but I think we still
have quite a bit of incompleteness.
We now consistently mark phis with
all arguments identical as copies.
Previously, they were inconsistently
eliminated by phisimpl(). An example
where they were not eliminated is
the following:
@blk2
%a = phi @blk0 %x, @blk1 %x
jnz ?, @blk3, @blk4
@blk3
%b = copy %x
@blk4
%c = phi @blk2 %a, @blk3 %b
In this example, neither %c nor %a
were marked as copies of %x because,
when phisimpl() is called, the copy
information for %b is not available.
The incompleteness is still present
and can be observed by modifying
the example above so that %a takes
a copy of %x through a back-edge.
Then, phisimpl()'s lack of copy
information about %b will prevent
optimization.
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This pass limits stack usage when
many small aggregates are allocated
on the stack. A fast liveness
analysis figures out which slots
interfere and the pass then fuses
slots that do not interfere. The
pass also kills stack slots that
are only ever assigned.
On the hare stdlib test suite, this
fusion pass managed to reduce the
total eligible slot bytes count
by 84%.
The slots considered for fusion
must not escape and not exceed
64 bytes in size.
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