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Coalescing Register Allocation

Coalescing Register Allocation. CS153: Compilers Greg Morrisett. Last Time:. Basic Graph-Coloring Register Allocation Build interference graph G use liveness analysis Simplify the graph G If x has degree < k, push x and simplify G-{x} if no such x, then we need to spill some temp.

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767 views • 58 slides

Borrowed from J. N. Amaral, slightly modified cs.ualberta/~amaral/courses/680

LIVE-IN: k j. g. g := mem[j+12]. h. h := k -1. f. f := g + h. e. e := mem[j+8]. m. m := mem[j+16]. b. b := mem[f]. c. c := e + 8. d. d := c. k := m + 4. j := b. LIVE-OUT: d k j.

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Idea of Register Allocation

Idea of Register Allocation. program:. x = m[0 ]; y = m[1 ]; xy = x*y; z = m[2 ]; yz = y*z; xz = x*z; r = xy + yz; m[3 ] = r + xz. live variable analysis result:.

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382 views • 31 slides

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Potential spill - PowerPoint PPT Presentation

Coalescing Register Allocation

Borrowed from J. N. Amaral, slightly modified cs.ualberta/~amaral/courses/680

Idea of Register Allocation