[GHC] #16354: LLVM Backend generates invalid assembly.

22 Feb 2019

      #16354: LLVM Backend generates invalid assembly.
-------------------------------------+-------------------------------------
           Reporter:  AndreasK       |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  high           |         Milestone:
          Component:  Compiler       |           Version:  8.9
  (LLVM)                             |
           Keywords:  CodeGen        |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
-------------------------------------+-------------------------------------
 {{{
 #!haskell
 module Main where

 import System.Random
 import qualified Data.Vector as V

 g1 = mkStdGen 0 :: StdGen
 v2 = take 10000 $ randoms g1 :: [Int]

 main :: IO ()
 main = do
     undefined
 }}}

 {{{
 $ /e/ghc_regSpill/inplace/bin/ghc-stage2.exe Repro.hs -O2 -fllvm -O2
 Loaded package environment from
 C:\ghc\msys64\home\Andi\tmp\minmax\unpred\.ghc.environment.x86_64-mingw32-8.7.20190215
 [1 of 1] Compiling Main             ( Repro.hs, Repro.o )
 C:\\ghc\\msys64\\tmp\\ghc385768_0\\ghc_6.s: Assembler messages:
 C:\\ghc\\msys64\\tmp\\ghc385768_0\\ghc_6.s:354: Error: junk at end of
 line, first unrecognized character is `,'
 `gcc.exe' failed in phase `Assembler'. (Exit code: 1)

 }}}

 I've reproduced this with ghc 8.4/8.6 and HEAD using llvm 7.0.1 on
 windows.

 It only occurs with -O2.

 The issues arise from these directives:

 {{{
         .section
 .rdata,"dr",discard,__xmm@000000000000004e0000000000000000
 }}}

-- 
Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/16354
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