`pass` test failures on 32-bit systems

[stevenfontanella]

When running

cmake -G Ninja -DCMAKE_CXX_FLAGS="-m32" -DCMAKE_C_FLAGS="-m32" -DCMAKE_BUILD_TYPE=Debug .
ninja
python3 check.py lit

I get test failures in passes/O_fast-math.wast and passes/optimize-instructions-mvp.wast. Both tests give the wrong NaN:

$ "filecheck" "/usr/local/google/home/stevenfont/code/binaryen/test/lit/passes/O_fast-math.wast"
# command output:
/usr/local/google/home/stevenfont/code/binaryen/test/lit/passes/O_fast-math.wast:41:17: error: CHECK-NEXT: expected string not found in input
 ;; CHECK-NEXT: (f32.const -nan:0x23017a)
                ^
<stdin>:19:1: note: scanning from here
  (f32.const -nan:0x63017a)
^

error: command failed with exit status: 1

[rathann]

I'm not getting those on Fedora. Try with -m32 -msse2 -mfpmath=sse.

[stevenfontanella]

I see. I tried

cmake -G Ninja -DCMAKE_CXX_FLAGS="-m32 -msse2 -mfpmath=sse" -DCMAKE_C_FLAGS="-m32 -msse2 -mfpmath=sse" -DCMAKE_BUILD_TYPE=Debug .
ninja
python3 check.py lit

and still got the same failure.

I guess it's possible that a fast math pass would have some non-determinism in its results, depending on the platform? If that's the case, then the test should account for this ideally. And I'm not sure if it's the same for optimize-instructions-mvp.wast.