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| author | Sandra Loosemore <sandra@codesourcery.com> | 2018-11-12 14:08:37 -0500 |
|---|---|---|
| committer | Sandra Loosemore <sandra@gcc.gnu.org> | 2018-11-12 14:08:37 -0500 |
| commit | 52ed66ec25474619919be18f3cf8a15cb7f6ea45 (patch) | |
| tree | accb2a8ffe3cf297c9425a4328b2c74a70ad39b4 /gcc | |
| parent | 6f59f36b9a5dcfbaf3893623f2588f207ddd8cbb (diff) | |
| download | gcc-52ed66ec25474619919be18f3cf8a15cb7f6ea45.zip gcc-52ed66ec25474619919be18f3cf8a15cb7f6ea45.tar.gz gcc-52ed66ec25474619919be18f3cf8a15cb7f6ea45.tar.bz2 | |
re PR middle-end/21110 (incorrect documentat for high and lo_sum RTL operators)
2018-11-12 Sandra Loosemore <sandra@codesourcery.com>
PR middle-end/21110
gcc/
* doc/rtl.texi (Constants): Clarify that mode of "high" doesn't
have to be Pmode.
(Arithmetic): Likewise for "lo_sum".
From-SVN: r266035
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 7 | ||||
| -rw-r--r-- | gcc/doc/rtl.texi | 20 |
2 files changed, 17 insertions, 10 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 6b4a14b..41b05fb 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,10 @@ +2018-11-12 Sandra Loosemore <sandra@codesourcery.com> + + PR middle-end/21110 + * doc/rtl.texi (Constants): Clarify that mode of "high" doesn't + have to be Pmode. + (Arithmetic): Likewise for "lo_sum". + 2018-11-12 Renlin Li <renlin.li@arm.com> PR target/87815 diff --git a/gcc/doc/rtl.texi b/gcc/doc/rtl.texi index ac8062d..9c00a7f 100644 --- a/gcc/doc/rtl.texi +++ b/gcc/doc/rtl.texi @@ -1883,14 +1883,14 @@ of relocation operator. @var{m} should be a valid address mode. @findex high @item (high:@var{m} @var{exp}) -Represents the high-order bits of @var{exp}, usually a -@code{symbol_ref}. The number of bits is machine-dependent and is +Represents the high-order bits of @var{exp}. +The number of bits is machine-dependent and is normally the number of bits specified in an instruction that initializes the high order bits of a register. It is used with @code{lo_sum} to represent the typical two-instruction sequence used in RISC machines to -reference a global memory location. - -@var{m} should be @code{Pmode}. +reference large immediate values and/or link-time constants such +as global memory addresses. In the latter case, @var{m} is @code{Pmode} +and @var{exp} is usually a constant expression involving @code{symbol_ref}. @end table @findex CONST0_RTX @@ -2429,15 +2429,15 @@ saturates at the maximum signed value representable in @var{m}; This expression represents the sum of @var{x} and the low-order bits of @var{y}. It is used with @code{high} (@pxref{Constants}) to -represent the typical two-instruction sequence used in RISC machines -to reference a global memory location. +represent the typical two-instruction sequence used in RISC machines to +reference large immediate values and/or link-time constants such +as global memory addresses. In the latter case, @var{m} is @code{Pmode} +and @var{y} is usually a constant expression involving @code{symbol_ref}. The number of low order bits is machine-dependent but is -normally the number of bits in a @code{Pmode} item minus the number of +normally the number of bits in mode @var{m} minus the number of bits set by @code{high}. -@var{m} should be @code{Pmode}. - @findex minus @findex ss_minus @findex us_minus |