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In certain cases of matching with very big binaries, the HiPE compiler
generated code that would fail the match, even in cases that the matching
was successful. The problem was more quite noticeable on 32-bit platforms
where certain integer quantities would be represented as bignums.
Brief summary of changes:
* gen_rtl({bs_skip_bits, ...}, ...) could not handle too large constants.
Previously the constants were truncated to word size.
* hipe_rtl_binary_match:make_size/3 erroneously assumed that the output
of first_part/3 would not overflow when multiplied by 8, which is no
longer true. To maintain full performance, the overflow test is only
performed when BitsVar was a bignum. Thus, the fast path is identical
to before.
* hipe_rtl_binary_match:set_high/2 was assuming that only bits below
bit 27 were ever set in arguments to bs_skip_bits, which is not only
false when the arguments are bignums, but also on 64-bit platforms.
The commit includes a test taken from the bs_match_bin_SUITE.
Most of the credit for finding these HiPE compiler errors and for
creating appropriate fixes for them should go to Magnus Lång.
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OTP-12845
* bruce/change-license:
fix errors caused by changed line numbers
Change license text to APLv2
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For quite some time now, this module generated a (quite harmless)
dialyzer warning. Comment out a clause which was actually unreachable.
While at it, do some small code refactorings here and there.
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This reverts commit 4dc5f194b0a5a6f052763bb7494b0458f98d96ca.
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This is a temporary fix, it's probably a better solution to
combine into one header tag for both map types.
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Namely, extend the HiPE tagging scheme info, properly handle the translation
of the (is_)map type test to Icode and RTL and support handling of the map()
type in the type system.
While at it, also performed some clean up of things that needed small fixes.
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The (is_)constant/1 guard is removed from Erlang long ago and thus
there is no need to handle it in RTL.
While editing these files, also performed some minor cleanup.
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Merging the three off-heap lists (binaries, funs and externals) into
one list. This reduces memory consumption by two words (pointers) per
ETS object.
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