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25112

Rev. 3.06

September 2005

Sort local variables according to their type sizes, allocating those with larger type sizes ahead of those 
with smaller type sizes.

This optimization applies to:

•

32-bit software

•

64-bit software

If the first variable is allocated for natural alignment, all other variables are allocated contiguously in 
the order they are declared and are naturally aligned without any padding.

Consider the following declarations in a C function:

short ga, gu, gi;

long foo, bar;

double x, y, z[3];

char a, b;

float baz;

Instead of allocating the variables in the order in which they are declared, allocate them from lower to 
higher addresses in the following order:

x, y, z[2], z[1], z[0], foo, bar, baz, ga, gu, gi, a, b

For information on sorting local variables at the C-source level, see “Sorting Local Variables” on 
page 41.