#5054: LLVM Errors with test cases
---------------------------------+------------------------------------------
Reporter: arsenm | Owner: davidterei@…
Type: bug | Status: new
Priority: normal | Component: Compiler (LLVM)
Version: 7.0.2 | Keywords:
Testcase: | Blockedby:
Os: Unknown/Multiple | Blocking:
Architecture: Unknown/Multiple | Failure: Compile-time crash
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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.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5054>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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