[project @ 2000-01-25 10:25:15 by sewardj]

Add missing final paragraph of explaination about x86 FP trickery.

diff --git a/ghc/compiler/nativeGen/MachMisc.lhs b/ghc/compiler/nativeGen/MachMisc.lhs
index f9947a4..0487b72 100644 (file)
--- a/ghc/compiler/nativeGen/MachMisc.lhs
+++ b/ghc/compiler/nativeGen/MachMisc.lhs
@@ -463,6 +463,12 @@ FP stack, the operation done, and the result copied back into the
 relevant register.  There are only six %fake registers because 2 are
 needed for the translation, and x86 has 8 in total.
 
+The translation is inefficient but is simple and it works.  A cleverer
+translation would handle a sequence of insns, simulating the FP stack
+contents, would not impose a fixed mapping from %fake to %st regs, and
+hopefully could avoid most of the redundant reg-reg moves of the
+current translation.
+
 \begin{code}
 #if i386_TARGET_ARCH