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[/] [or1k/] [trunk/] [newlib-1.10.0/] [newlib/] [libc/] [machine/] [h8500/] [mulsi3.c] - Diff between revs 1007 and 1765

Rev 1007	Rev 1765

`typedef union {`	`typedef union {`
`struct {`	`struct {`
`unsigned int msw;`	`unsigned int msw;`
`unsigned int lsw;`	`unsigned int lsw;`
`} s;`	`} s;`
`long v;`	`long v;`
`} u;`	`} u;`

`long __mulsi3(u a, u b)`	`long __mulsi3(u a, u b)`
`{`	`{`
`int s;`	`int s;`
`long pp1;`	`long pp1;`
`long pp2;`	`long pp2;`
`long r;`	`long r;`

`if (a.s.msw == 0 &&`	`if (a.s.msw == 0 &&`
`b.s.msw == 0)`	`b.s.msw == 0)`
`{`	`{`
`return (long)a.s.lsw * b.s.lsw;`	`return (long)a.s.lsw * b.s.lsw;`
`}`	`}`

`s = 0;`	`s = 0;`
`if (a.v < 0)`	`if (a.v < 0)`
`{`	`{`
`s = 1;`	`s = 1;`
`a.v = - a.v;`	`a.v = - a.v;`
`}`	`}`
`if (b.v < 0)`	`if (b.v < 0)`
`{`	`{`
`s = 1-s;`	`s = 1-s;`
`b.v = - b.v;`	`b.v = - b.v;`
`}`	`}`

`pp1 = (long)a.s.lsw * b.s.lsw ;`	`pp1 = (long)a.s.lsw * b.s.lsw ;`
`pp2 = (long)a.s.lsw * b.s.msw + (long)a.s.msw * b.s.lsw;`	`pp2 = (long)a.s.lsw * b.s.msw + (long)a.s.msw * b.s.lsw;`

`pp1 += pp2 << 16;`	`pp1 += pp2 << 16;`

`if (s)`	`if (s)`
`{`	`{`
`pp1 = -pp1;`	`pp1 = -pp1;`
`}`	`}`
`return pp1;`	`return pp1;`
`}`	`}`
`long __mulpsi3(long a, long b)`	`long __mulpsi3(long a, long b)`
`{`	`{`
`return a*b;`	`return a*b;`
`}`	`}`


`short`	`short`
`__mulhi3(short a, short b)`	`__mulhi3(short a, short b)`
`{`	`{`
`int r;`	`int r;`

`r = 0;`	`r = 0;`
`while (a)`	`while (a)`
`{`	`{`
`if (a & 1)`	`if (a & 1)`
`{`	`{`
`r += b;`	`r += b;`

`}`	`}`
`b<<=1;`	`b<<=1;`
`a>>=1;`	`a>>=1;`

`}`	`}`
`return r;`	`return r;`
`}`	`}`