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(rotate_gr): Fix off-by-1 bug and simplify the function.

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(Logical change 1.93)
This commit is contained in:
mostang.com!davidm 2003-08-20 18:02:30 +00:00
parent 0b65016a37
commit 4d40a1cfc8
1 changed files with 5 additions and 9 deletions
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14
src/ia64/regs.h
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@ -1,26 +1,22 @@
#include "unwind_i.h" #include "unwind_i.h"
/* Apply rotation to a general register. The number REG must be in /* Apply rotation to a general register. REG must be in the range 0-127. */
the range of 0-127. */
static inline int static inline int
rotate_gr (struct cursor *c, int reg) rotate_gr (struct cursor *c, int reg)
{ {
unsigned int rrb_gr, sor, sof; unsigned int rrb_gr, sor;
int preg; int preg;
sof = (c->cfm & 0x7f);
sor = 8 * ((c->cfm >> 14) & 0xf); sor = 8 * ((c->cfm >> 14) & 0xf);
rrb_gr = (c->cfm >> 18) & 0x7f; rrb_gr = (c->cfm >> 18) & 0x7f;
if ((unsigned) (reg - 32) > sof) if ((unsigned) (reg - 32) >= sor)
return reg; /* not a valid stacked register: just return original value */ preg = reg;
else if ((unsigned) (reg - 32) > sor)
preg = reg; /* register not part of the rotating partition */
else else
{ {
preg = reg + rrb_gr; /* apply rotation */ preg = reg + rrb_gr; /* apply rotation */
if (preg > 32 + (int) sor) if ((unsigned) (preg - 32) >= sor)
preg -= sor; /* wrap around */ preg -= sor; /* wrap around */
} }
if (sor) if (sor)