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Results are presented of an analysis of proton and charged pion azimuthal distributions measured with respect to the reaction plane in Au ϩ Au collisions at a beam momentum of about 11A GeV/c. The azimuthal anisotropy is studied as a function of particle rapidity and transverse momentum for different centralities of the collisions. The triple differential ͑in rapidity, transverse momentum, and azimuthal angle͒ distributions are reconstructed. A comparison of the results with a previous analysis of charged-particle and transverse energy flow as well as with model predictions are presented. ͓S0556-2813͑97͒05711-7͔ PACS number͑s͒: 25.75.Dw

This paper discusses algorithms which transform expression trees into code for register machmes A necessary and sufficient condition for optimahty of such an algorithm is derived, whmh applies to a broad class of machines A dynamm programming algorithm is then presented which produces optimal code for any machine in this class, this algorithm runs in time hnearly proportional to the size of the input KEY WORDS AND PHRASES code generation, expressions, register machine, algorithms, optlmahty CR CATEGORIES 4 12

This paper shows the problem of generating optimal code for expressions containing common subexpresslons is computationally difficult, even for simple expressions and simple machines Some heuristics for code generation are given and their worst-case behavior is analyzed For one register machines, an optimal code generation algorithm is given whose time complexity is linear m the size of an expression and exponential only in the amount of sharing KEY WORDS AND PHRASES compilers, programming language translation, optimahty CR CATEGORIES 4 12

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