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[rs6000] Add documentation for __builtin_mtfsf

2019-07-21  Paul A. Clarke  <>


	* doc/extend.texi: Add documentation for __builtin_mtfsf.

Index: gcc/doc/extend.texi
--- gcc/doc/extend.texi	(revision 273615)
+++ gcc/doc/extend.texi	(working copy)
@@ -16848,6 +16848,7 @@ unsigned long __builtin_ppc_mftb ();
 double __builtin_unpack_ibm128 (__ibm128, int);
 __ibm128 __builtin_pack_ibm128 (double, double);
 double __builtin_mffs (void);
+double __builtin_mtfsf (const int, double);
 void __builtin_mtfsb0 (const int);
 void __builtin_mtfsb1 (const int);
 void __builtin_set_fpscr_rn (int);
@@ -16864,6 +16865,10 @@ return the value of the FPSCR register.  Note, ISA
 @code{__builtin_mffsl()} which permits software to read the control and
 non-sticky status bits in the FSPCR without the higher latency associated with
 accessing the sticky status bits.  The
+@code{__builtin_mtfsf} takes a constant 8-bit integer field mask and a
+representation of the new value of the FPSCR and generates the @code{mtfsf}
+instruction to copy the supplied value into the FPSCR, subject to the field
+mask, each bit of which represents a nibble of the FPSCR.  The
 @code{__builtin_mtfsb0} and @code{__builtin_mtfsb1} take the bit to change
 as an argument.  The valid bit range is between 0 and 31.  The builtins map to
 the @code{mtfsb0} and @code{mtfsb1} instructions which take the argument and


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