aboutsummaryrefslogtreecommitdiffstats
path: root/lib/hipe/rtl/hipe_rtl_binary_match.erl
diff options
context:
space:
mode:
authorKostis Sagonas <[email protected]>2016-11-03 17:16:01 +0100
committerKostis Sagonas <[email protected]>2016-11-03 17:16:01 +0100
commit1257cee4faf33cc69c9452ba54afe5d5dbd4ddf6 (patch)
treea367455fa28bf1b548debd8de49b1a3caa282fe4 /lib/hipe/rtl/hipe_rtl_binary_match.erl
parent0e8268be503ea53c100fef03d498ad7cc642c11b (diff)
downloadotp-1257cee4faf33cc69c9452ba54afe5d5dbd4ddf6.tar.gz
otp-1257cee4faf33cc69c9452ba54afe5d5dbd4ddf6.tar.bz2
otp-1257cee4faf33cc69c9452ba54afe5d5dbd4ddf6.zip
Fix the native code translation of bs_match_string
This fixes a HiPE bug reported on erlang-questions on 2/11/2016. The BEAM to ICode tranaslation of the bs_match_string instruction, written long ago for binaries (i.e., with byte-sized strings), tried to do a `clever' translation of even bit-sized strings using a HiPE primop that took a `Size' argument expressed in *bytes*. ICode is not really the place to do such a thing, and moreover there is really no reason for the HiPE primop not to take a Size argument expressed in *bits* instead. This commit changes the `Size' argument to be in bits, postpones the translation of the bs_match_string primop Fixed in a pair-programming/debugging session with @margnus1. until RTL and does a proper translation using bit-sized quantities there.
Diffstat (limited to 'lib/hipe/rtl/hipe_rtl_binary_match.erl')
-rw-r--r--lib/hipe/rtl/hipe_rtl_binary_match.erl37
1 files changed, 18 insertions, 19 deletions
diff --git a/lib/hipe/rtl/hipe_rtl_binary_match.erl b/lib/hipe/rtl/hipe_rtl_binary_match.erl
index 528672b893..d999cd2743 100644
--- a/lib/hipe/rtl/hipe_rtl_binary_match.erl
+++ b/lib/hipe/rtl/hipe_rtl_binary_match.erl
@@ -270,24 +270,23 @@ gen_rtl({bs_save, Slot}, [NewMs], [Ms], TrueLblName, _FalseLblName) ->
set_field_from_term({matchstate, {saveoffset, Slot}}, Ms, Offset),
hipe_rtl:mk_goto(TrueLblName)];
%% ----- bs_match_string -----
-gen_rtl({bs_match_string, String, ByteSize}, Dst, [Ms],
+gen_rtl({bs_match_string, String, BitSize}, Dst, [Ms],
TrueLblName, FalseLblName) ->
{[Offset, BinSize, Base], Instrs} =
extract_matchstate_vars([offset, binsize, base], Ms),
[SuccessLbl, ALbl, ULbl] = create_lbls(3),
[NewOffset, BitOffset] = create_gcsafe_regs(2),
- Unit = hipe_rtl_arch:word_size() - 1,
- Loops = ByteSize div Unit,
- Init =
+ Unit = (hipe_rtl_arch:word_size() - 1) * ?BYTE_SIZE,
+ Init =
[Instrs,
opt_update_ms(Dst, Ms),
- check_size(Offset, hipe_rtl:mk_imm(ByteSize*?BYTE_SIZE), BinSize,
+ check_size(Offset, hipe_rtl:mk_imm(BitSize), BinSize,
NewOffset, hipe_rtl:label_name(SuccessLbl), FalseLblName),
SuccessLbl],
SplitCode =
[hipe_rtl:mk_alub(BitOffset, Offset, 'and', hipe_rtl:mk_imm(?LOW_BITS), eq,
hipe_rtl:label_name(ALbl), hipe_rtl:label_name(ULbl))],
- Loops = ByteSize div Unit,
+ Loops = BitSize div Unit,
SkipSize = Loops * Unit,
{ACode1, UCode1} =
case Loops of
@@ -297,9 +296,9 @@ gen_rtl({bs_match_string, String, ByteSize}, Dst, [Ms],
create_loops(Loops, Unit, String, Base,
Offset, BitOffset, FalseLblName)
end,
- <<_:SkipSize/binary, RestString/binary>> = String,
+ <<_:SkipSize/bits, RestString/bits>> = String,
{ACode2, UCode2} =
- case ByteSize rem Unit of
+ case BitSize rem Unit of
0 ->
{[], []};
Rem ->
@@ -393,12 +392,12 @@ validate_unicode_retract_c_code(Src, Ms, TrueLblName, FalseLblName) ->
create_loops(Loops, Unit, String, Base, Offset, BitOffset, FalseLblName) ->
[Reg] = create_gcsafe_regs(1),
AlignedFun = fun(Value) ->
- [get_int_to_reg(Reg, Unit*?BYTE_SIZE, Base, Offset, 'srl',
+ [get_int_to_reg(Reg, Unit, Base, Offset, 'srl',
{unsigned, big}),
update_and_test(Reg, Unit, Offset, Value, FalseLblName)]
end,
UnAlignedFun = fun(Value) ->
- [get_unaligned_int_to_reg(Reg, Unit*?BYTE_SIZE,
+ [get_unaligned_int_to_reg(Reg, Unit,
Base, Offset, BitOffset,
'srl', {unsigned, big})|
update_and_test(Reg, Unit, Offset, Value, FalseLblName)]
@@ -406,31 +405,31 @@ create_loops(Loops, Unit, String, Base, Offset, BitOffset, FalseLblName) ->
{create_loops(Loops, Unit, String, AlignedFun),
create_loops(Loops, Unit, String, UnAlignedFun)}.
-create_rests(Rem, String, Base, Offset, BitOffset, FalseLblName) ->
+create_rests(RemBits, String, Base, Offset, BitOffset, FalseLblName) ->
[Reg] = create_gcsafe_regs(1),
AlignedFun = fun(Value) ->
- [get_int_to_reg(Reg, Rem*?BYTE_SIZE, Base, Offset, 'srl',
+ [get_int_to_reg(Reg, RemBits, Base, Offset, 'srl',
{unsigned, big})|
just_test(Reg, Value, FalseLblName)]
end,
UnAlignedFun = fun(Value) ->
- [get_unaligned_int_to_reg(Reg, Rem*?BYTE_SIZE,
+ [get_unaligned_int_to_reg(Reg, RemBits,
Base, Offset, BitOffset,
'srl', {unsigned, big})|
just_test(Reg, Value, FalseLblName)]
end,
- {create_loops(1, Rem, String, AlignedFun),
- create_loops(1, Rem, String, UnAlignedFun)}.
+ {create_loops(1, RemBits, String, AlignedFun),
+ create_loops(1, RemBits, String, UnAlignedFun)}.
create_loops(0, _Unit, _String, _IntFun) ->
[];
create_loops(N, Unit, String, IntFun) ->
- {Value, RestString} = get_value(Unit,String),
+ {Value, RestString} = get_value(Unit, String),
[IntFun(Value),
create_loops(N-1, Unit, RestString, IntFun)].
update_and_test(Reg, Unit, Offset, Value, FalseLblName) ->
- [add_to_offset(Offset, Offset, hipe_rtl:mk_imm(Unit*?BYTE_SIZE), FalseLblName),
+ [add_to_offset(Offset, Offset, hipe_rtl:mk_imm(Unit), FalseLblName),
just_test(Reg, Value, FalseLblName)].
just_test(Reg, Value, FalseLblName) ->
@@ -439,8 +438,8 @@ just_test(Reg, Value, FalseLblName) ->
hipe_rtl:label_name(ContLbl), FalseLblName),
ContLbl].
-get_value(N,String) ->
- <<I:N/integer-unit:8, Rest/binary>> = String,
+get_value(N, String) ->
+ <<I:N, Rest/bits>> = String,
{I, Rest}.
make_int_gc_code(I) when is_integer(I) ->