[llvm-bugs] [Bug 44046] New: Compiler crash when attempting to build compiler-rt against wasm32-wasi target

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=44046

            Bug ID: 44046
           Summary: Compiler crash when attempting to build compiler-rt
                    against wasm32-wasi target
           Product: clang
           Version: 9.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: rstewart at mozilla.com
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org,
                    neeilans at live.com, richard-llvm at metafoo.co.uk

Created attachment 22834
  --> https://bugs.llvm.org/attachment.cgi?id=22834&action=edit
Preprocessed source

Attempting to compile `compiler-rt` on Ubuntu against the `wasm32-wasi` target
with Clang 9 causes a compiler crash. See the attached run script/preprocessed
source file. I also tried a `creduce` run on the source file to attempt to
reduce the crash; the result is also attached.

```
[1/157] /home/rstewart/src/clang/bin/clang --target=wasm32-wasi
--sysroot=/home/rstewart/src/wasi-sdk/opt/wasi-sdk/share/wasi-sysroot
-DVISIBILITY_HIDDEN  -O1 -O2 -g -DNDEBUG    -m64 -std=c11 -fno-builtin
-fvisibility=hidden -fomit-frame-pointer -MD -MT
CMakeFiles/clang_rt.builtins-x86_64.dir/fixtfsi.c.obj -MF
CMakeFiles/clang_rt.builtins-x86_64.dir/fixtfsi.c.obj.d -o
CMakeFiles/clang_rt.builtins-x86_64.dir/fixtfsi.c.obj   -c
/home/rstewart/src/llvm-project/compiler-rt/lib/builtins/fixtfsi.c
FAILED: CMakeFiles/clang_rt.builtins-x86_64.dir/fixtfsi.c.obj 
/home/rstewart/src/clang/bin/clang --target=wasm32-wasi
--sysroot=/home/rstewart/src/wasi-sdk/opt/wasi-sdk/share/wasi-sysroot
-DVISIBILITY_HIDDEN  -O1 -O2 -g -DNDEBUG    -m64 -std=c11 -fno-builtin
-fvisibility=hidden -fomit-frame-pointer -MD -MT
CMakeFiles/clang_rt.builtins-x86_64.dir/fixtfsi.c.obj -MF
CMakeFiles/clang_rt.builtins-x86_64.dir/fixtfsi.c.obj.d -o
CMakeFiles/clang_rt.builtins-x86_64.dir/fixtfsi.c.obj   -c
/home/rstewart/src/llvm-project/compiler-rt/lib/builtins/fixtfsi.c
fatal error: error in backend: Cannot select: 0x673f078: ch = brcond 0x6739d68,
0x673f420, BasicBlock:ch< 0x6733570>,
llvm-project/compiler-rt/lib/builtins/fp_fixint_impl.inc:27:7 @[
llvm-project/compiler-rt/lib/builtins/fixtfsi.c:17:51 ]
  0x673f420: i64 = setcc 0x673a790, Constant:i32<0>, setlt:ch,
llvm-project/compiler-rt/lib/builtins/fp_fixint_impl.inc:27:16 @[
llvm-project/compiler-rt/lib/builtins/fixtfsi.c:17:51 ]
    0x673a790: i32 = add nsw 0x673a5f0, Constant:i32<-16383>,
llvm-project/compiler-rt/lib/builtins/fp_fixint_impl.inc:23:24 @[
llvm-project/compiler-rt/lib/builtins/fixtfsi.c:17:51 ]
      0x673a5f0: i32 = and 0x673f3b8, Constant:i32<32767>,
llvm-project/compiler-rt/lib/builtins/fp_fixint_impl.inc:23:24 @[
llvm-project/compiler-rt/lib/builtins/fixtfsi.c:17:51 ]
        0x673f3b8: i32 = truncate 0x673f350,
llvm-project/compiler-rt/lib/builtins/fp_fixint_impl.inc:23:24 @[
llvm-project/compiler-rt/lib/builtins/fixtfsi.c:17:51 ]
          0x673f350: i64 = srl 0x6739c98, Constant:i64<48>,
llvm-project/compiler-rt/lib/builtins/fp_fixint_impl.inc:23:30 @[
llvm-project/compiler-rt/lib/builtins/fixtfsi.c:17:51 ]
            0x6739c98: i64 = WebAssemblyISD::ARGUMENT TargetConstant:i32<1>
              0x6739c30: i32 = TargetConstant<1>
            0x6739dd0: i64 = Constant<48>
        0x673a588: i32 = Constant<32767>
      0x673a728: i32 = Constant<-16383>
    0x673ee08: i32 = Constant<0>
In function: __fixtfsi
clang-9: error: clang frontend command failed with exit code 70 (use -v to see
invocation)
clang version 9.0.0 (tags/RELEASE_900/final)
Target: wasm64-unknown-wasi
Thread model: posix
InstalledDir: /home/rstewart/src/clang/bin
clang-9: note: diagnostic msg: PLEASE submit a bug report to
https://bugs.llvm.org/ and include the crash backtrace, preprocessed source,
and associated run script.
clang-9: note: diagnostic msg: 
********************

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang-9: note: diagnostic msg: /tmp/fixtfsi-0fc7da.c
clang-9: note: diagnostic msg: /tmp/fixtfsi-0fc7da.sh
clang-9: note: diagnostic msg: 

********************
```

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