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author | Chris Lattner <sabre@nondot.org> | 2009-11-26 01:51:18 +0000 |
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committer | Chris Lattner <sabre@nondot.org> | 2009-11-26 01:51:18 +0000 |
commit | 9c6a0dcf0e5ccc99e55ad9c1f70eede532004775 (patch) | |
tree | 6b2592ac8767c059920c35517396d9152c820c1a /lib/Target/README.txt | |
parent | 11fe72661dac17efa1564ef6fc212acae4f0c07e (diff) | |
download | llvm-9c6a0dcf0e5ccc99e55ad9c1f70eede532004775.tar.gz llvm-9c6a0dcf0e5ccc99e55ad9c1f70eede532004775.tar.bz2 llvm-9c6a0dcf0e5ccc99e55ad9c1f70eede532004775.tar.xz |
update some notes slightly
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89913 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Target/README.txt')
-rw-r--r-- | lib/Target/README.txt | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/lib/Target/README.txt b/lib/Target/README.txt index aad621f440..6d90f05a46 100644 --- a/lib/Target/README.txt +++ b/lib/Target/README.txt @@ -220,7 +220,7 @@ so cool to turn it into something like: ... which would only do one 32-bit XOR per loop iteration instead of two. It would also be nice to recognize the reg->size doesn't alias reg->node[i], but -alas. +this requires TBAA. //===---------------------------------------------------------------------===// @@ -280,6 +280,9 @@ unsigned int popcount(unsigned int input) { return count; } +This is a form of idiom recognition for loops, the same thing that could be +useful for recognizing memset/memcpy. + //===---------------------------------------------------------------------===// These should turn into single 16-bit (unaligned?) loads on little/big endian @@ -343,7 +346,7 @@ PHI Slicing could be extended to do this. //===---------------------------------------------------------------------===// -LSR should know what GPR types a target has. This code: +LSR should know what GPR types a target has from TargetData. This code: volatile short X, Y; // globals @@ -369,7 +372,6 @@ LBB1_2: LSR should reuse the "+" IV for the exit test. - //===---------------------------------------------------------------------===// Tail call elim should be more aggressive, checking to see if the call is |