X-Git-Url: https://git.distorted.org.uk/~mdw/catacomb/blobdiff_plain/f521d4c7a97076db34681c598d7965c7d05713b0..a90d420cbe87490c844ae422c966e746d3134b07:/math/fgoldi.h

diff --git a/math/fgoldi.h b/math/fgoldi.h
index 4f6c043f..6e351079 100644
--- a/math/fgoldi.h
+++ b/math/fgoldi.h
@@ -134,6 +134,52 @@ extern void fgoldi_add(fgoldi */*z*/,
 extern void fgoldi_sub(fgoldi */*z*/,
 		       const fgoldi */*x*/, const fgoldi */*y*/);
 
+/* --- @fgoldi_neg@ --- *
+ *
+ * Arguments:	@fgoldi *z@ = where to put the result (may alias @x@)
+ *		@const fgoldi *x@ = an operand
+ *
+ * Returns:	---
+ *
+ * Use:		Set @z = -x@.
+ */
+
+extern void fgoldi_neg(fgoldi */*z*/, const fgoldi */*x*/);
+
+/* --- @fgoldi_pick2@ --- *
+ *
+ * Arguments:	@fgoldi *z@ = where to put the result (may alias @x@ or @y@)
+ *		@const fgoldi *x, *y@ = two operands
+ *		@uint32 m@ = a mask
+ *
+ * Returns:	---
+ *
+ * Use:		If @m@ is zero, set @z = y@; if @m@ is all-bits-set, then set
+ *		@z = x@.  If @m@ has some other value, then scramble @z@ in
+ *		an unhelpful way.
+ */
+
+extern void fgoldi_pick2(fgoldi */*z*/,
+			 const fgoldi */*x*/, const fgoldi */*y*/,
+			 uint32 /*m*/);
+
+/* --- @fgoldi_pickn@ --- *
+ *
+ * Arguments:	@fgoldi *z@ = where to put the result
+ *		@const fgoldi *v@ = a table of entries
+ *		@size_t n@ = the number of entries in @v@
+ *		@size_t i@ = an index
+ *
+ * Returns:	---
+ *
+ * Use:		If @0 <= i < n < 32@ then set @z = v[i]@.  If @n >= 32@ then
+ *		do something unhelpful; otherwise, if @i >= n@ then set @z@
+ *		to zero.
+ */
+
+extern void fgoldi_pickn(fgoldi */*z*/,
+			 const fgoldi */*v*/, size_t /*n*/, size_t /*i*/);
+
 /* --- @fgoldi_condswap@ --- *
  *
  * Arguments:	@fgoldi *x, *y@ = two operands
@@ -148,6 +194,21 @@ extern void fgoldi_sub(fgoldi */*z*/,
 
 extern void fgoldi_condswap(fgoldi */*x*/, fgoldi */*y*/, uint32 /*m*/);
 
+/* --- @fgoldi_condneg@ --- *
+ *
+ * Arguments:	@fgoldi *z@ = where to put the result (may alias @x@)
+ *		@const fgoldi *x@ = an operand
+ *		@uint32 m@ = a mask
+ *
+ * Returns:	---
+ *
+ * Use:		If @m@ is zero, set @z = x@; if @m@ is all-bits-set, then set
+ *		@z = -x@.  If @m@ has some other value then scramble @z@ in
+ *		an unhelpful way.
+ */
+
+extern void fgoldi_condneg(fgoldi */*z*/, const fgoldi */*x*/, uint32 /*m*/);
+
 /* --- @fgoldi_mulconst@ --- *
  *
  * Arguments:	@fgoldi *z@ = where to put the result (may alias @x@)
@@ -200,6 +261,22 @@ extern void fgoldi_sqr(fgoldi */*z*/, const fgoldi */*x*/);
 
 extern void fgoldi_inv(fgoldi */*z*/, const fgoldi */*x*/);
 
+/* --- @fgoldi_quosqrt@ --- *
+ *
+ * Arguments:	@fgoldi *z@ = where to put the result (may alias @x@ or @y@)
+ *		@const fgoldi *x, *y@ = two operands
+ *
+ * Returns:	Zero if successful, @-1@ if %$x/y$% is not a square.
+ *
+ * Use:		Stores in @z@ the one of the square roots %$\pm\sqrt{x/y}$%.
+ *		If %$x = y = 0% then the result is zero; if %$y = 0$% but %$x
+ *		\ne 0$% then the operation fails.  If you wanted a specific
+ *		square root then you'll have to pick it yourself.
+ */
+
+extern int fgoldi_quosqrt(fgoldi */*z*/,
+			  const fgoldi */*x*/, const fgoldi */*y*/);
+
 /*----- That's all, folks -------------------------------------------------*/
 
 #ifdef __cplusplus