[llvm-bugs] [Bug 38865] New: x32: error in backend: Unable to copy EFLAGS physical register!

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=38865

            Bug ID: 38865
           Summary: x32: error in backend: Unable to copy EFLAGS physical
                    register!
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: X86
          Assignee: unassignedbugs at nondot.org
          Reporter: theonetruecamper at gmx.de
                CC: llvm-bugs at lists.llvm.org

reduced test case:

==> /tmp/test-c03594.cpp <==
# 1 "<built-in>"
# 1 "test.cpp"
struct a { a(const a&); };
a b() { return b(); }

==> /tmp/test-c03594.sh <==
# Crash reproducer for clang version 6.0.1 (tags/RELEASE_601/final)
# Driver args: "--driver-mode=g++" "-c" "test.cpp" "-O0" "-v"
# Original command:  "/usr/lib/llvm/6/bin/clang-6.0" "-cc1" "-triple"
"x86_64-pc-linux-gnux32" "-emit-obj" "-mrelax-all" "-disable-free"
"-disable-llvm-verifier" "-discard-value-names" "-main-file-name" "test.cpp"
"-mrelocation-model" "static" "-mthread-model" "posix" "-mdisable-fp-elim"
"-fmath-errno" "-masm-verbose" "-mconstructor-aliases" "-munwind-tables"
"-fuse-init-array" "-target-cpu" "x86-64" "-dwarf-column-info"
"-debugger-tuning=gdb" "-v" "-coverage-notes-file" "/home/sphinx/test.gcno"
"-resource-dir" "/usr/lib/llvm/6/bin/../../../../lib/clang/6.0.1"
"-internal-isystem" "/usr/lib/gcc/x86_64-pc-linux-gnux32/7.3.0/include/g++-v7"
"-internal-isystem"
"/usr/lib/gcc/x86_64-pc-linux-gnux32/7.3.0/include/g++-v7/x86_64-pc-linux-gnux32"
"-internal-isystem"
"/usr/lib/gcc/x86_64-pc-linux-gnux32/7.3.0/include/g++-v7/backward"
"-internal-isystem" "/usr/local/include" "-internal-isystem"
"/usr/lib/llvm/6/bin/../../../../lib/clang/6.0.1/include"
"-internal-externc-isystem" "/include" "-internal-externc-isystem"
"/usr/include" "-O0" "-fdeprecated-macro" "-fdebug-compilation-dir"
"/home/sphinx" "-ferror-limit" "19" "-fmessage-length" "173"
"-fobjc-runtime=gcc" "-fcxx-exceptions" "-fexceptions"
"-fdiagnostics-show-option" "-fcolor-diagnostics" "-o" "test.o" "-x" "c++"
"test.cpp"
 "/usr/lib/llvm/6/bin/clang-6.0" "-cc1" "-triple" "x86_64-pc-linux-gnux32"
"-emit-obj" "-mrelax-all" "-disable-free" "-disable-llvm-verifier"
"-discard-value-names" "-main-file-name" "test.cpp" "-mrelocation-model"
"static" "-mthread-model" "posix" "-mdisable-fp-elim" "-fmath-errno"
"-masm-verbose" "-mconstructor-aliases" "-munwind-tables" "-fuse-init-array"
"-target-cpu" "x86-64" "-dwarf-column-info" "-debugger-tuning=gdb" "-v"
"-coverage-notes-file" "/home/sphinx/test.gcno" "-O0" "-fdeprecated-macro"
"-ferror-limit" "19" "-fmessage-length" "173" "-fobjc-runtime=gcc"
"-fcxx-exceptions" "-fexceptions" "-fdiagnostics-show-option"
"-fcolor-diagnostics" "-x" "c++" "test-c03594.cpp"

Attempting to compile with -O0 but not any other optimization level results in
this output, the problem also exists in trunk:

$ /usr/lib/llvm/6/bin/clang++ -c test.cpp -O0 -v -mx32
clang version 6.0.1 (tags/RELEASE_601/final)
Target: x86_64-pc-linux-gnux32
Thread model: posix
InstalledDir: /usr/lib/llvm/6/bin
Selected GCC installation: /usr/lib/gcc/x86_64-pc-linux-gnux32/7.3.0
Candidate multilib: .;@mx32
Candidate multilib: 64;@m64
Candidate multilib: 32;@m32
Selected multilib: .;@mx32
 "/usr/lib/llvm/6/bin/clang-6.0" -cc1 -triple x86_64-pc-linux-gnux32 -emit-obj
-mrelax-all -disable-free -disable-llvm-verifier -discard-value-names
-main-file-name test.cpp -mrelocation-model static -mthread-model posix
-mdisable-fp-elim -fmath-errno -masm-verbose -mconstructor-aliases
-munwind-tables -fuse-init-array -target-cpu x86-64 -dwarf-column-info
-debugger-tuning=gdb -v -coverage-notes-file /home/sphinx/test.gcno
-resource-dir /usr/lib/llvm/6/bin/../../../../lib/clang/6.0.1 -internal-isystem
/usr/lib/gcc/x86_64-pc-linux-gnux32/7.3.0/include/g++-v7 -internal-isystem
/usr/lib/gcc/x86_64-pc-linux-gnux32/7.3.0/include/g++-v7/x86_64-pc-linux-gnux32
-internal-isystem
/usr/lib/gcc/x86_64-pc-linux-gnux32/7.3.0/include/g++-v7/backward
-internal-isystem /usr/local/include -internal-isystem
/usr/lib/llvm/6/bin/../../../../lib/clang/6.0.1/include
-internal-externc-isystem /include -internal-externc-isystem /usr/include -O0
-fdeprecated-macro -fdebug-compilation-dir /home/sphinx -ferror-limit 19
-fmessage-length 173 -fobjc-runtime=gcc -fcxx-exceptions -fexceptions
-fdiagnostics-show-option -fcolor-diagnostics -o test.o -x c++ test.cpp
clang -cc1 version 6.0.1 based upon LLVM 6.0.1 default target
x86_64-pc-linux-gnux32
ignoring nonexistent directory "/usr/local/include"
ignoring nonexistent directory "/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/lib/gcc/x86_64-pc-linux-gnux32/7.3.0/include/g++-v7

/usr/lib/gcc/x86_64-pc-linux-gnux32/7.3.0/include/g++-v7/x86_64-pc-linux-gnux32
 /usr/lib/gcc/x86_64-pc-linux-gnux32/7.3.0/include/g++-v7/backward
 /usr/lib/llvm/6/bin/../../../../lib/clang/6.0.1/include
 /usr/include
End of search list.
fatal error: error in backend: Unable to copy EFLAGS physical register!
clang-6.0: error: clang frontend command failed with exit code 70 (use -v to
see invocation)
clang version 6.0.1 (tags/RELEASE_601/final)
Target: x86_64-pc-linux-gnux32
Thread model: posix
InstalledDir: /usr/lib/llvm/6/bin

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