Fix Int8#, Int16#, Word8#, Word16# tests under LLVM code generator

Unfortunately it looks like LLVM doesn't like that we use bitcast to narrow integers. E.g. CmpWord8 currently fails with:

=====> CmpWord8(llvm) 18 of 23 [0, 6, 0]
cd "primops/should_run/CmpWord8.run" &&  "/mnt/work/ghc/ghc-compare-1/inplace/test   spaces/ghc-stage2" -o CmpWord8 CmpWord8.hs -dcore-lint -dcmm-lint -no-user-package-db -rtsopts -fno-warn-missed-specialisations -fshow-warning-groups -fdiagnostics-color=never -fno-diagnostics-show-caret -Werror=compat -dno-debug-output  -fllvm 
Compile failed (exit code 1) errors were:
[1 of 1] Compiling Main             ( CmpInt8.hs, CmpInt8.o )
opt: /run/user/1000/ghc32287_0/ghc_2.ll:14549:20: error: invalid cast opcode for cast from 'i64' to 'i8'
  %ln6uE = bitcast i64 %ln6uD to i8
                   ^
`opt' failed in phase `LLVM Optimiser'. (Exit code: 1)

Trac metadata

Trac field	Value
Version	8.6.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler (LLVM)
Test case
Differential revisions
BlockedBy
Related
Blocking
CC	michalt
Operating system
Architecture

changed milestone to %8.8.1

changed weight to 5

added LLVM backend Tbug Trac import labels

I thought that validate tests LLVM backend if LLVM is available, but this doesn't seem to be happening (despite testsuite is running with -e ghc_with_llvm=True)..?

In any case, I'm testing fixes. Thanks for CCing me!

mentioned in commit f424515f

closed

I think this should be fixed. :) Please reopen if there's still something wrong.

Trac metadata

Trac field	Value
Resolution	Unresolved → ResolvedFixed

added Pnormal label