Merge in new code generator branch.

[ghc-hetmet.git] / compiler / nativeGen / X86 / Instr.hs

diff --git a/compiler/nativeGen/X86/Instr.hs b/compiler/nativeGen/X86/Instr.hs
index 00ce130..28b7997 100644 (file)
--- a/compiler/nativeGen/X86/Instr.hs
+++ b/compiler/nativeGen/X86/Instr.hs
@@ -21,7 +21,7 @@ import Reg
 import TargetReg
 
 import BlockId
-import Cmm
+import OldCmm
 import FastString
 import FastBool
 import Outputable
@@ -102,7 +102,7 @@ Hence GLDZ and GLD1.  Bwahahahahahahaha!
 -}
 
 {-
-MORE FLOATING POINT MUSINGS...
+Note [x86 Floating point precision]
 
 Intel's internal floating point registers are by default 80 bit
 extended precision.  This means that all operations done on values in
@@ -141,11 +141,12 @@ This is what gcc does.  Spilling at 80 bits requires taking up a full
 128 bit slot (so we get alignment).  We spill at 80-bits and ignore
 the alignment problems.
 
-In the future, we'll use the SSE registers for floating point.  This
-requires a CPU that supports SSE2 (ordinary SSE only supports 32 bit
-precision float ops), which means P4 or Xeon and above.  Using SSE
-will solve all these problems, because the SSE registers use fixed 32
-bit or 64 bit precision.
+In the future [edit: now available in GHC 7.0.1, with the -msse2
+flag], we'll use the SSE registers for floating point.  This requires
+a CPU that supports SSE2 (ordinary SSE only supports 32 bit precision
+float ops), which means P4 or Xeon and above.  Using SSE will solve
+all these problems, because the SSE registers use fixed 32 bit or 64
+bit precision.
 
 --SDM 1/2003
 -}
@@ -777,24 +778,24 @@ canShortcut _                  = Nothing
 -- This helper shortcuts a sequence of branches.
 -- The blockset helps avoid following cycles.
 shortcutJump :: (BlockId -> Maybe JumpDest) -> Instr -> Instr
-shortcutJump fn insn = shortcutJump' fn emptyBlockSet insn
+shortcutJump fn insn = shortcutJump' fn (setEmpty :: BlockSet) insn
   where shortcutJump' fn seen insn@(JXX cc id) =
-          if elemBlockSet id seen then insn
+          if setMember id seen then insn
           else case fn id of
                  Nothing                -> insn
                  Just (DestBlockId id') -> shortcutJump' fn seen' (JXX cc id')
                  Just (DestImm imm)     -> shortcutJump' fn seen' (JXX_GBL cc imm)
-               where seen' = extendBlockSet seen id
+               where seen' = setInsert id seen
         shortcutJump' _ _ other = other
 
 -- Here because it knows about JumpDest
 shortcutStatic :: (BlockId -> Maybe JumpDest) -> CmmStatic -> CmmStatic
 shortcutStatic fn (CmmStaticLit (CmmLabel lab))
   | Just uq <- maybeAsmTemp lab 
-  = CmmStaticLit (CmmLabel (shortBlockId fn emptyUniqSet (BlockId uq)))
+  = CmmStaticLit (CmmLabel (shortBlockId fn emptyUniqSet (mkBlockId uq)))
 shortcutStatic fn (CmmStaticLit (CmmLabelDiffOff lbl1 lbl2 off))
   | Just uq <- maybeAsmTemp lbl1
-  = CmmStaticLit (CmmLabelDiffOff (shortBlockId fn emptyUniqSet (BlockId uq)) lbl2 off)
+  = CmmStaticLit (CmmLabelDiffOff (shortBlockId fn emptyUniqSet (mkBlockId uq)) lbl2 off)
         -- slightly dodgy, we're ignoring the second label, but this
         -- works with the way we use CmmLabelDiffOff for jump tables now.
 
@@ -807,10 +808,11 @@ shortBlockId
        -> BlockId
        -> CLabel
 
-shortBlockId fn seen blockid@(BlockId uq) =
+shortBlockId fn seen blockid =
   case (elementOfUniqSet uq seen, fn blockid) of
     (True, _)    -> mkAsmTempLabel uq
     (_, Nothing) -> mkAsmTempLabel uq
     (_, Just (DestBlockId blockid'))  -> shortBlockId fn (addOneToUniqSet seen uq) blockid'
     (_, Just (DestImm (ImmCLbl lbl))) -> lbl
     (_, _other) -> panic "shortBlockId"
+  where uq = getUnique blockid