> Hence, I now believe that your suggested doc change is correct, and is
> OK to check in to mainline.
Committed. Thanks!
Index: ChangeLog
===================================================================
--- ChangeLog (revision 131702)
+++ ChangeLog (working copy)
@@ -1,6 +1,11 @@
+2008-01-21 DJ Delorie <[EMAIL PROTECTED]>
+
+ * doc/tm.texi (HARD_REGNO_NREGS): Note that this macro must not
+ return zero.
+
2008-01-21 Richard Guenther <[EMAIL PROTECTED]>
PR middle-end/34856
* tree-cfg.c (verify_expr): Allow all invariant expressions
instead of just constant class ones as reference argument.
* tree-ssa-loop-im.c (for_each_index): Handle CONSTRUCTOR
Index: doc/tm.texi
===================================================================
--- doc/tm.texi (revision 131702)
+++ doc/tm.texi (working copy)
@@ -2076,13 +2076,15 @@ This section discusses the macros that d
(specifically, which machine modes) each register can hold, and how many
consecutive registers are needed for a given mode.
@defmac HARD_REGNO_NREGS (@var{regno}, @var{mode})
A C expression for the number of consecutive hard registers, starting
at register number @var{regno}, required to hold a value of mode
[EMAIL PROTECTED]
[EMAIL PROTECTED] This macro must never return zero, even if a register
+cannot hold the requested mode - indicate that with HARD_REGNO_MODE_OK
+and/or CANNOT_CHANGE_MODE_CLASS instead.
On a machine where all registers are exactly one word, a suitable
definition of this macro is
@smallexample
#define HARD_REGNO_NREGS(REGNO, MODE) \
