File 2924-beam_ssa_type-Remove-unreachable-code.patch of Package erlang

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File 2924-beam_ssa_type-Remove-unreachable-code.patch of Package erlang (Revision 1e94e72e3f4fed1ca9cd5c2fd777ed02)

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From 5789206390cfffe63a47077647ac20084a42ba39 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B6rn=20Gustavsson?= <bjorn@erlang.org>
Date: Fri, 5 Feb 2021 13:46:17 +0100
Subject: [PATCH 14/18] beam_ssa_type: Remove unreachable code

Remove code accidentally left during refatoring in ccbfba252aae.
---
 lib/compiler/src/beam_ssa_type.erl | 15 ++++++---------
 1 file changed, 6 insertions(+), 9 deletions(-)

diff --git a/lib/compiler/src/beam_ssa_type.erl b/lib/compiler/src/beam_ssa_type.erl
index 5801bbbc08..0132ad40f7 100644
--- a/lib/compiler/src/beam_ssa_type.erl
+++ b/lib/compiler/src/beam_ssa_type.erl
@@ -979,6 +979,9 @@ will_succeed(#b_set{args=[Src]}, Ts, Ds, Sub) ->
             %% Checked operation never returns.
             no;
         {#{ Src := I }, #{}} ->
+            %% There can't be any substitution because the instruction
+            %% is still there.
+            false = is_map_key(Src, Sub),        %Assertion.
             will_succeed_1(I, Src, Ts, Sub);
         {#{}, #{}} ->
             %% The checked instruction has been removed and substituted, so we
@@ -1082,15 +1085,9 @@ will_succeed_1(#b_set{op=wait_timeout}, _Src, _Ts, _Sub) ->
 will_succeed_1(#b_set{op=wait}, _Src, _Ts, _Sub) ->
     no;
 
-will_succeed_1(#b_set{}, Src, Ts, Sub) ->
-    case simplify_arg(Src, Ts, Sub) of
-        #b_var{}=Src ->
-            %% No substitution; might fail at runtime.
-            maybe;
-        _ ->
-            %% Substituted with literal or other variable; always succeeds.
-            yes
-    end.
+
+will_succeed_1(#b_set{}, _Src, _Ts, _Sub) ->
+    maybe.
 
 simplify_is_record(I, #t_tuple{exact=Exact,
                                size=Size,
-- 
2.26.2

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File 2924-beam_ssa_type-Remove-unreachable-code.patch of Package erlang (Revision 1e94e72e3f4fed1ca9cd5c2fd777ed02)

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