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* doc/tree-ssa.texi (Interfaces): Describe low vs. high GIMPLE. 

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Ben Elliston 2006-02-19 23:09:26 +00:00 committed by Ben Elliston
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@ -1,3 +1,7 @@
2006-02-20 Ben Elliston <bje@au.ibm.com>
* doc/tree-ssa.texi (Interfaces): Describe low vs. high GIMPLE.
2006-02-19 Roger Sayle <roger@eyesopen.com>
Steven Bosscher <stevenb.gcc@gmail.com>

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@ -132,6 +132,11 @@ convert the front end trees to GIMPLE@. Usually such a hook will involve
much of the same code for expanding front end trees to RTL@. This function
can return fully lowered GIMPLE, or it can return GENERIC trees and let the
main gimplifier lower them the rest of the way; this is often simpler.
GIMPLE that is not fully lowered is known as ``high GIMPLE'' and
consists of the IL before the pass @code{pass_lower_cf}. High GIMPLE
still contains lexical scopes and nested expressions, while low GIMPLE
exposes all of the implicit jumps for control expressions like
@code{COND_EXPR}.
The C and C++ front ends currently convert directly from front end
trees to GIMPLE, and hand that off to the back end rather than first