Fix #3182: 64 bit FP value returned by C calls was getting trashed

   movss instruction was being used to move the result into the
   destination register instead of movsd

diff --git a/compiler/nativeGen/X86/CodeGen.hs b/compiler/nativeGen/X86/CodeGen.hs
index 135ac36..4cfeacc 100644 (file)
--- a/compiler/nativeGen/X86/CodeGen.hs
+++ b/compiler/nativeGen/X86/CodeGen.hs
@@ -1779,7 +1779,7 @@ genCCall target dest_regs args = do
        assign_code [CmmHinted dest _hint] = 
          case typeWidth rep of
                W32 | isFloatType rep -> unitOL (MOV (floatSize W32) (OpReg xmm0) (OpReg r_dest))
        assign_code [CmmHinted dest _hint] = 
          case typeWidth rep of
                W32 | isFloatType rep -> unitOL (MOV (floatSize W32) (OpReg xmm0) (OpReg r_dest))

-               W64 | isFloatType rep -> unitOL (MOV (floatSize W32) (OpReg xmm0) (OpReg r_dest))
+               W64 | isFloatType rep -> unitOL (MOV (floatSize W64) (OpReg xmm0) (OpReg r_dest))

                _ -> unitOL (MOV (cmmTypeSize rep) (OpReg rax) (OpReg r_dest))
          where 
                rep = localRegType dest
                _ -> unitOL (MOV (cmmTypeSize rep) (OpReg rax) (OpReg r_dest))
          where 
                rep = localRegType dest