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Diffstat (limited to 'lib/Target/Alpha/README.txt')
-rw-r--r-- | lib/Target/Alpha/README.txt | 30 |
1 files changed, 0 insertions, 30 deletions
diff --git a/lib/Target/Alpha/README.txt b/lib/Target/Alpha/README.txt index cde7140294..7f54cff252 100644 --- a/lib/Target/Alpha/README.txt +++ b/lib/Target/Alpha/README.txt @@ -151,33 +151,3 @@ $L8: %%%%%%%%%%%%%%%%%%%%%%%%%%%%%% Fix Ordered/Unordered FP stuff - -%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% -improve bytezap opertunities -ulong %foo(ulong %y) { -entry: - %tmp = and ulong %y, 65535 - %tmp2 = shr ulong %tmp, ubyte 3 - ret ulong %tmp2 -} - - -compiles to a 3 instruction sequence without instcombine - zapnot $16,3,$0 - srl $0,3,$0 - ret $31,($26),1 - -After instcombine you get -ulong %foo(ulong %y) { -entry: - %tmp = shr ulong %y, ubyte 3 ; <ulong> [#uses=1] - %tmp2 = and ulong %tmp, 8191 ; <ulong> [#uses=1] - ret ulong %tmp2 -} - -which compiles to - lda $0,8191($31) - srl $16,3,$1 - and $1,$0,$0 - ret $31,($26),1 - |