llvm-6502

mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-01-22 10:33:23 +00:00

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Chris Lattner 4e998b2fea Fold binary expressions and casts into PHI nodes that have all constant inputs.

This takes something like this:

%A = phi int [ 3, %cond_false.0 ], [ 2, %endif.0.i ], [ 2, %endif.1.i ]
%B = div int %tmp.243, 4

and turns it into:

%A = phi int [ 3/4, %cond_false.0 ], [ 2/4, %endif.0.i ], [ 2/4, %endif.1.i ]

which is later simplified (in this case) into %A = 0.

This triggers thousands of times in spec, for example, 269 times in 176.gcc.

This is tested by InstCombine/add.ll:test23 and set.ll:test18.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16582 91177308-0d34-0410-b5e6-96231b3b80d8

2004-09-29 05:07:12 +00:00

Hello

Add a newline

2004-09-15 17:53:52 +00:00

Instrumentation

'Pass' should now not be derived from by clients. Instead, they should derive

2004-09-20 04:48:05 +00:00

IPO

'Pass' should now not be derived from by clients. Instead, they should derive

2004-09-20 04:48:05 +00:00

Scalar

Fold binary expressions and casts into PHI nodes that have all constant inputs.