diff options
Diffstat (limited to 'gcc/doc')
| -rw-r--r-- | gcc/doc/gimple.texi | 36 |
1 files changed, 18 insertions, 18 deletions
diff --git a/gcc/doc/gimple.texi b/gcc/doc/gimple.texi index e8cecd7..d20358a 100644 --- a/gcc/doc/gimple.texi +++ b/gcc/doc/gimple.texi @@ -424,8 +424,8 @@ using @code{get_initialized_tmp_var} or @code{create_tmp_var}. Currently, an expression like @code{a = b + 5} is not reduced any further. We tried converting it to something like @smallexample - T1 = b + 5; - a = T1; +T1 = b + 5; +a = T1; @end smallexample but this bloated the representation for minimal benefit. However, a variable which must live in memory cannot appear in an expression; its @@ -443,12 +443,12 @@ GIMPLE rvalue (@code{is_gimple_val}), i.e.@: a constant or a register variable. More complex operands are factored out into temporaries, so that @smallexample - a = b + c + d +a = b + c + d @end smallexample becomes @smallexample - T1 = b + c; - a = T1 + d; +T1 = b + c; +a = T1 + d; @end smallexample The same rule holds for arguments to a @code{GIMPLE_CALL}. @@ -481,8 +481,8 @@ workaround for limitations in later optimizers; if we were to convert this to @smallexample - T1 = &a.b; - T1[2] = 42; +T1 = &a.b; +T1[2] = 42; @end smallexample alias analysis would not remember that the reference to @code{T1[2]} came @@ -498,15 +498,15 @@ A C @code{?:} expression is converted into an @code{if} statement with each branch assigning to the same temporary. So, @smallexample - a = b ? c : d; +a = b ? c : d; @end smallexample becomes @smallexample - if (b == 1) - T1 = c; - else - T1 = d; - a = T1; +if (b == 1) + T1 = c; +else + T1 = d; +a = T1; @end smallexample The GIMPLE level if-conversion pass re-introduces @code{?:} @@ -525,10 +525,10 @@ Except when they appear in the condition operand of a as follows: @code{a = b && c} becomes @smallexample - T1 = (bool)b; - if (T1 == true) - T1 = (bool)c; - a = T1; +T1 = (bool)b; +if (T1 == true) + T1 = (bool)c; +a = T1; @end smallexample Note that @code{T1} in this example cannot be an expression temporary, @@ -2545,7 +2545,7 @@ Additional parameters to @code{walk_tree} must be stored in @code{WI}. For each operand @code{OP}, @code{walk_tree} is called as: @smallexample - walk_tree (&@code{OP}, @code{CALLBACK_OP}, @code{WI}, @code{WI}- @code{PSET}) +walk_tree (&@code{OP}, @code{CALLBACK_OP}, @code{WI}, @code{PSET}) @end smallexample If @code{CALLBACK_OP} returns non-@code{NULL} for an operand, the remaining |