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File 1098-compiler-Eliminate-internal-error-in-sub-pass-ssa_op.patch of Package erlang (Revision 1e94e72e3f4fed1ca9cd5c2fd777ed02)

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From 71136a9adf9a114297f82bad0140f0577cf2142a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B6rn=20Gustavsson?= <bjorn@erlang.org>
Date: Fri, 4 Nov 2022 10:06:34 +0100
Subject: [PATCH] compiler: Eliminate internal error in sub pass
 ssa_opt_bsm_shortcut

Closes #6426
---
 lib/compiler/src/beam_ssa_opt.erl    | 7 ++++---
 lib/compiler/test/bs_match_SUITE.erl | 9 +++++++++
 2 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/lib/compiler/src/beam_ssa_opt.erl b/lib/compiler/src/beam_ssa_opt.erl
index 4533b5b2ef..e10189afd8 100644
--- a/lib/compiler/src/beam_ssa_opt.erl
+++ b/lib/compiler/src/beam_ssa_opt.erl
@@ -1766,14 +1766,15 @@ coalesce_skips_is([#b_set{op=bs_match,
                           args=[#b_literal{val=skip},
                                 Ctx0,Type,Flags,
                                 #b_literal{val=Size0},
-                                #b_literal{val=Unit0}]}=Skip0,
+                                #b_literal{val=Unit0}],
+                          dst=Ctx}=Skip0,
                    #b_set{op={succeeded,guard}}],
                   #b_br{succ=L2,fail=Fail}=Br0,
                   Bs0) when is_integer(Size0) ->
     case Bs0 of
         [{L2,#b_blk{is=[#b_set{op=bs_match,
                                dst=SkipDst,
-                               args=[#b_literal{val=skip},_,_,_,
+                               args=[#b_literal{val=skip},Ctx,_,_,
                                      #b_literal{val=Size1},
                                      #b_literal{val=Unit1}]},
                         #b_set{op={succeeded,guard}}=Succeeded],
@@ -1787,7 +1788,7 @@ coalesce_skips_is([#b_set{op=bs_match,
             Is = [Skip,Succeeded],
             {Is,Br,Bs};
         [{L2,#b_blk{is=[#b_set{op=bs_test_tail,
-                               args=[_Ctx,#b_literal{val=TailSkip}]}],
+                               args=[Ctx,#b_literal{val=TailSkip}]}],
                     last=#b_br{succ=NextSucc,fail=Fail}}}|Bs] ->
             SkipBits = Size0 * Unit0,
             TestTail = Skip0#b_set{op=bs_test_tail,
diff --git a/lib/compiler/test/bs_match_SUITE.erl b/lib/compiler/test/bs_match_SUITE.erl
index f5e33113ee..b477109f45 100644
--- a/lib/compiler/test/bs_match_SUITE.erl
+++ b/lib/compiler/test/bs_match_SUITE.erl
@@ -2448,6 +2448,11 @@ empty_matches(Config) when is_list(Config) ->
     <<Zero:0/unit:1>> = id(<<>>),
     0 = id(Zero),
 
+    ok = em_4(<<>>, <<>>),
+    {'EXIT',{function_clause,[_|_]}} = catch em_4(<<>>, <<0:1>>),
+    {'EXIT',{function_clause,[_|_]}} = catch em_4(<<0:1>>, <<>>),
+    {'EXIT',{function_clause,[_|_]}} = catch em_4(<<0:1>>, <<0:1>>),
+
     ok.
 
 em_1(Bytes) ->
@@ -2471,6 +2476,10 @@ em_3(<<V:0/binary,Rest/bits>>) ->
 
 id(I) -> I.
 
+%% GH-6426/OTP-xxxxx
+em_4(<<X:0, _:X>>, <<Y:0, _:Y>>) ->
+    ok.
+
 expand_and_squeeze(Config) when is_list(Config) ->
     %% UTF8 literals are expanded and then squeezed into integer16
     [
-- 
2.35.3

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File 1098-compiler-Eliminate-internal-error-in-sub-pass-ssa_op.patch of Package erlang (Revision 1e94e72e3f4fed1ca9cd5c2fd777ed02)

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