diff options
Diffstat (limited to 'gcc/doc/extend.texi')
| -rw-r--r-- | gcc/doc/extend.texi | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/gcc/doc/extend.texi b/gcc/doc/extend.texi index 67d03c32d33..07a7721f933 100644 --- a/gcc/doc/extend.texi +++ b/gcc/doc/extend.texi @@ -15470,10 +15470,15 @@ The following low level built-in functions are available with @option{-mhtm} or @option{-mcpu=CPU} where CPU is `power8' or later. They all generate the machine instruction that is part of the name. -The HTM built-ins return true or false depending on their success and -their arguments match exactly the type and order of the associated -hardware instruction's operands. Refer to the ISA manual for a -description of each instruction's operands. +The HTM builtins (with the exception of @code{__builtin_tbegin}) return +the full 4-bit condition register value set by their associated hardware +instruction. The header file @code{htmintrin.h} defines some macros that can +be used to decipher the return value. The @code{__builtin_tbegin} builtin +returns a simple true or false value depending on whether a transaction was +successfully started or not. The arguments of the builtins match exactly the +type and order of the associated hardware instruction's operands, except for +the @code{__builtin_tcheck} builtin, which does not take any input arguments. +Refer to the ISA manual for a description of each instruction's operands. @smallexample unsigned int __builtin_tbegin (unsigned int) @@ -15485,7 +15490,7 @@ unsigned int __builtin_tabortdci (unsigned int, unsigned int, int) unsigned int __builtin_tabortwc (unsigned int, unsigned int, unsigned int) unsigned int __builtin_tabortwci (unsigned int, unsigned int, int) -unsigned int __builtin_tcheck (unsigned int) +unsigned int __builtin_tcheck (void) unsigned int __builtin_treclaim (unsigned int) unsigned int __builtin_trechkpt (void) unsigned int __builtin_tsr (unsigned int) @@ -15620,7 +15625,7 @@ TM_buff_type TM_buff; while (1) @{ - if (__TM_begin (TM_buff)) + if (__TM_begin (TM_buff) == _HTM_TBEGIN_STARTED) @{ /* Transaction State Initiated. */ if (is_locked (lock)) |