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Summary: - If only two registers are passed to a three-register operation, then the first argument is both source and destination register. - If a non-register is passed as the last argument, generate the immediate version of the instruction. Also mark DADD commutative and add scheduling information (to the generic scheduler), and implement DSUB. Patch by David Chisnall His work was sponsored by: DARPA, AFRL CC: theraven Differential Revision: http://llvm-reviews.chandlerc.com/D3148 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@204605 91177308-0d34-0410-b5e6-96231b3b80d8
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