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SubjectRe: [Linux-NTFS-Dev] [PATCH] reduce large stack usage
Hi Randy,

On Fri, Feb 28, 2003 at 11:06:23PM -0800, Randy.Dunlap wrote:
> This patch to 2.5.63 reduces stack usage in generate_default_upcase()
> from 0x3d4 bytes to just noise (on x86).
>
> The arrays are static so they are still private (hidden), but
> now they aren't allocated on the stack and copied there for
> temp use.

BTW, you can declare "local" variables inside a function as static,
which makes them "global", but locally scoped. The code should be
basically equivalent, but perhaps more elegant...

i.e.:

uchar_t *generate_default_upcase(void)
{
- const int uc_run_table[][3] = { /* Start, End, Add */
+static const int uc_run_table[][3] = { /* Start, End, Add */
{0x0061, 0x007B, -32}, {0x0451, 0x045D, -80}, {0x1F70, 0x1F72, 74},
{0x00E0, 0x00F7, -32}, {0x045E, 0x0460, -80}, {0x1F72, 0x1F76, 86},
{0x00F8, 0x00FF, -32}, {0x0561, 0x0587, -48}, {0x1F76, 0x1F78, 100},

Cheers,
Andrew

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