diff options
Diffstat (limited to 'gcc/doc')
| -rw-r--r-- | gcc/doc/rtl.texi | 15 |
1 files changed, 1 insertions, 14 deletions
diff --git a/gcc/doc/rtl.texi b/gcc/doc/rtl.texi index 0814b66..3df7982 100644 --- a/gcc/doc/rtl.texi +++ b/gcc/doc/rtl.texi @@ -3295,18 +3295,6 @@ There is one other known use for clobbering a pseudo register in a clobbered by the insn. In this case, using the same pseudo register in the clobber and elsewhere in the insn produces the expected results. -@findex clobber_high -@item (clobber_high @var{x}) -Represents the storing or possible storing of an unpredictable, -undescribed value into the upper parts of @var{x}. The mode of the expression -represents the lower parts of the register which will not be overwritten. -@code{reg} must be a reg expression. - -One place this is used is when calling into functions where the registers are -preserved, but only up to a given number of bits. For example when using -Aarch64 SVE, calling a TLS descriptor will cause only the lower 128 bits of -each of the vector registers to be preserved. - @findex use @item (use @var{x}) Represents the use of the value of @var{x}. It indicates that the @@ -3360,8 +3348,7 @@ Represents several side effects performed in parallel. The square brackets stand for a vector; the operand of @code{parallel} is a vector of expressions. @var{x0}, @var{x1} and so on are individual side effect expressions---expressions of code @code{set}, @code{call}, -@code{return}, @code{simple_return}, @code{clobber} @code{use} or -@code{clobber_high}. +@code{return}, @code{simple_return}, @code{clobber} or @code{use}. ``In parallel'' means that first all the values used in the individual side-effects are computed, and second all the actual side-effects are |