simonmar 2005/04/11 01:52:29 PDT
Modified files:
ghc/compiler/codeGen CgUtils.hs
Log:
When generating a switch for:
case e of
0 -> A
1 -> B
instead of generating
if (e < 1) then goto A
B
generate
if (e >= 1) then goto B
A
because this helps the NCG to generate better code. In particular, if
e is a comparison, then we don't need to reverse the sense of the
comparison to eliminate the comparse against 1 (the NCG does try to
reverse the comparison, but floating-point comparisons can't be
reversed).
Revision Changes Path
1.16 +13 -5 fptools/ghc/compiler/codeGen/CgUtils.hs
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