Changeset 13950

Timestamp:

Jul 10, 2010, 3:42:28 AM (9 years ago)

Author:

rme

Message:

Add comment about Liunx struct _fpstate.

File:

• branches/rme-fpe/lisp-kernel/platform-linuxx8632.h (modified) (1 diff)

branches/rme-fpe/lisp-kernel/platform-linuxx8632.h

@@ -38 +38 @@
 #define xpPC(x) (xpGPR(x,Iip))
 #define xpMMXreg(x,n)  *((natural *)(&((x)->uc_mcontext.fpregs->_st[n])))
+/* You're supposed to look at a magic field in the struct _fpstate
+   to know if there is sse2 state present; we only run on systems
+   with sse2, so we'll assume it's always there. */
 #define xpMXCSR(xp) (((struct _fpstate *)((xp)->uc_mcontext.fpregs))->mxcsr)
 #define eflags_register(xp) xpGPR(xp,Iflags)