Add Int8# and Word8#

This is the first step of implementing:
https://github.com/ghc-proposals/ghc-proposals/pull/74

The main highlights/changes:

- `primops.txt.pp` gets two new sections for two new primitive types
  for signed and unsigned 8-bit integers (`Int8#` and `Word8`
  respectively) along with basic arithmetic and comparison
  operations. `PrimRep`/`RuntimeRep` get two new constructors for
  them. All of the primops translate into the existing `MachOP`s.

- For `CmmCall`s the codegen will now zero-extend the values at call
  site (so that they can be moved to the right register) and then
  truncate them back their original width.

- x86 native codegen needed some updates, since it wasn't able to deal
  with the new widths, but all the changes are quite localized. LLVM
  backend seems to just work.

Bumps binary submodule.

Signed-off-by: Michal Terepeta <michal.terepeta@gmail.com>

Test Plan: ./validate with new tests

Reviewers: hvr, goldfire, bgamari, simonmar

Subscribers: Abhiroop, dfeuer, rwbarton, thomie, carter

Differential Revision: https://phabricator.haskell.org/D4475

1 files changed, 11 insertions, 6 deletions

diff --git a/compiler/ghci/ByteCodeGen.hs b/compiler/ghci/ByteCodeGen.hs
index 022fe89306..e673cfed0a 100644
--- a/compiler/ghci/ByteCodeGen.hs
+++ b/compiler/ghci/ByteCodeGen.hs
@@ -805,7 +805,7 @@ mkConAppCode orig_d _ p con args_r_to_l =
 
             do_pushery !d (arg : args) = do
                 (push, arg_bytes) <- case arg of
-                    (Padding l _) -> pushPadding l
+                    (Padding l _) -> return $! pushPadding l
                     (FieldOff a _) -> pushConstrAtom d p (fromNonVoid a)
                 more_push_code <- do_pushery (d + arg_bytes) args
                 return (push `appOL` more_push_code)
@@ -1569,11 +1569,16 @@ pushConstrAtom d p (AnnVar v)
 
 pushConstrAtom d p expr = pushAtom d p expr
 
-pushPadding :: Int -> BcM (BCInstrList, ByteOff)
-pushPadding 1 = return (unitOL (PUSH_PAD8), 1)
-pushPadding 2 = return (unitOL (PUSH_PAD16), 2)
-pushPadding 4 = return (unitOL (PUSH_PAD32), 4)
-pushPadding x = panic $ "pushPadding x=" ++ show x
+pushPadding :: Int -> (BCInstrList, ByteOff)
+pushPadding !n = go n (nilOL, 0)
+  where
+    go n acc@(!instrs, !off) = case n of
+        0 -> acc
+        1 -> (instrs `mappend` unitOL PUSH_PAD8, off + 1)
+        2 -> (instrs `mappend` unitOL PUSH_PAD16, off + 2)
+        3 -> go 1 (go 2 acc)
+        4 -> (instrs `mappend` unitOL PUSH_PAD32, off + 4)
+        _ -> go (n - 4) (go 4 acc)
 
 -- -----------------------------------------------------------------------------
 -- Given a bunch of alts code and their discrs, do the donkey work