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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30515 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2006-09-20 06:32:10 +00:00
parent 84750587bf
commit 7e932de7f5
1 changed files with 16 additions and 0 deletions
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16
lib/Target/X86/README.txt
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@ -734,3 +734,19 @@ This currently compiles to:
addl $12, %esp
The add\sub pair is really unneeded here.
//===---------------------------------------------------------------------===//
We generate really bad code in some cases due to lowering SETCC/SELECT at
legalize time, which prevents the post-legalize dag combine pass from
understanding the code. As a silly example, this prevents us from folding
stuff like this:
bool %test(ulong %x) {
%tmp = setlt ulong %x, 4294967296
ret bool %tmp
}
into x.h == 0