LLVM Errors with test cases
I encountered a build error when using the LLVM backend on my homework. I attempted to get a reduced test case, but ended up running into a different problem. I don't really have the time to reduce these to simpler cases right now, and I figured it would be better to report this rather than doing nothing.
In the original problem, the build fails with:
$ ghc -fllvm -O2 TestCase.hs
[1 of 1] Compiling Main ( TestCase.hs, TestCase.o )
LLVM ERROR: Cannot yet select: 0x2793a60: f64 = sint_to_fp 0x2795aa0 [ORD=2066] [ID=74]
0x2795aa0: i64 = add 0x27b9e30, 0x2791990 [ORD=2065] [ID=72]
0x27b9e30: i64,ch = load 0x2761e08, 0x2796db0, 0x27927a0<LD8[%ln79D]> [ORD=2064] [ID=70]
0x2761e08: ch = EntryToken [ORD=2061] [ID=0]
0x2796db0: i64 = add 0x27977b0, 0x27967a0 [ORD=2062] [ID=64]
0x27977b0: i64,ch = CopyFromReg 0x2761e08, 0x27a76b0 [ORD=2062] [ID=45]
0x2761e08: ch = EntryToken [ORD=2061] [ID=0]
0x27a76b0: i64 = Register %reg16387 [ORD=2062] [ID=2]
0x27967a0: i64 = Constant<7> [ORD=2062] [ID=3]
0x27927a0: i64 = undef [ORD=2064] [ID=4]
0x2791990: i64 = Constant<-1> [ORD=2065] [ID=5]
The second error I encountered was:
TestCase2.hs:
ghc -fforce-recomp -fllvm -O2 TestCase2.hs
[1 of 1] Compiling Main ( TestCase2.hs, TestCase2.o )
LLVM ERROR: Cannot yet select: 0x13834e0: f64 = ConstantFP<0.000000e+00> [ORD=1600] [ID=7]Replacing the peek/poke with undefined seems to make the errors go away. The programs build and work correctly with the default NCG, and with -O0. The errors happen with -O1 and -O2. Both were using LLVM 2.8 on Linux x86_64.
Trac metadata
| Trac field | Value |
|---|---|
| Version | 7.0.2 |
| Type | Bug |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | Unresolved |
| Component | Compiler (LLVM) |
| Test case | |
| Differential revisions | |
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| Related | |
| Blocking | |
| CC | |
| Operating system | |
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