swiftc IF issue

[ScriptBasic]

There seems to be a problem with an IF compare with swiftc. The swift interpreter works fine.

// Swift - 1mil.swift

var accum = 0
var milvar = 1000000

for _ in 1...1000000 {
accum += 1
milvar -= 1
if accum == milvar {
print("Middle")
}
}

print("Plus: ", accum)
print("Minus: ", milvar)

Interpretive

$ /usr/bin/time swift 1mil.swift
Middle
Plus: 1000000
Minus: 0
0.80user 0.05system 0:00.86elapsed 99%CPU (0avgtext+0avgdata 78392maxresident)k
240inputs+0outputs (2major+4179minor)pagefaults 0swaps

Compiled

$ swiftc 1mil.swift
$ ls -l 1mil
-rwxr-xr-x 1 pi pi 14524 Nov 25 17:08 1mil
$ /usr/bin/time ./1mil
Plus: 1000000
Minus: 0
0.24user 0.01system 0:00.25elapsed 99%CPU (0avgtext+0avgdata 6428maxresident)k
0inputs+0outputs (0major+268minor)pagefaults 0swaps

[uraimo]

I can't replicate this issue, which Swift release/architecture/distribution are you using? My prebuilt 5.1.1? I'm asking because swiftc should produce a main binary now, not 1mil

[ScriptBasic]

Yes. Your pre-built.

pi@RPi4B:~ $ swiftc -v
Swift version 5.1.1 (swift-5.1.1-RELEASE)
Target: armv7-unknown-linux-gnueabihf
pi@RPi4B:~ $

I'm running on a RPi 4B 4GB with 32 bit Raspbain Buster.

[ScriptBasic]

I'm building the 5.12 release from source. I had to move the llvm-project contents down to the base directory for build.sh to run. Since I'm running on a RPi 4B with 4GB, I passed on the swap file section of instructions.

I'll let you know how it turns out. (still building)

[ScriptBasic]

The 5.12 build corrected the IF compare issue. Would you like a link to the swift-5.1.2_armv7.tgz file on my server?

[uraimo]

Replies in reverse order ;)

The 5.12 build corrected the IF compare issue.

Weird, just to keep this logged somewhere, if you still have the 5.1.1 1mil binary with the issue and if it's not too big, can you upload it here?
For the toolchain, I already have a few builds ready but I'm holding off because I'd like to find a workaround for #60 .

I had to move the llvm-project contents down to the base directory for build.sh to run.

Starting from scratch works too, good to know that a manual copy works too, thanks.

I'm running on a RPi 4B 4GB with 32 bit Raspbain Buster.

This was the same configuration I tried it on, very strange issue.

[ScriptBasic]

Your request was too late. I no longer have 5.1.1 installed or the bad 1mil that was generated.

[uraimo]

Oh ok, no problem.