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extend.texi: Document some architecture specific constraints and sort entries.

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* doc/extend.texi: Document some architecture specific
	constraints and sort entries.

From-SVN: r260977
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Borislav Petkov 2018-05-30 22:49:25 +00:00 • committed by Jeff Law
parent 3ce4cdb2f7
commit e91c9fe500
2 changed files with 68 additions and 36 deletions
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@ -1,3 +1,8 @@
2018-05-30 Borislav Petkov <bp@suse.de>
* doc/extend.texi: Document some architecture specific
constraints and sort entries.
2018-05-30 Martin Sebor <msebor@redhat.com>
PR middle-end/85369

99
gcc/doc/extend.texi
View file

@ -9285,14 +9285,14 @@ top:
asm volatile goto ("some assembler instructions here"
: /* No outputs. */
: "q" (iInt), "X" (sizeof(unsigned char) + 1)
: "q" (iInt), "X" (sizeof(unsigned char) + 1), "i" (42)
: /* No clobbers. */
: top);
@}
@end example
With no modifiers, this is what the output from the operands would be for the
@samp{att} and @samp{intel} dialects of assembler:
With no modifiers, this is what the output from the operands would be
for the @samp{att} and @samp{intel} dialects of assembler:
@multitable {Operand} {$.L2} {OFFSET FLAT:.L2}
@headitem Operand @tab @samp{att} @tab @samp{intel}
@ -9302,55 +9302,82 @@ With no modifiers, this is what the output from the operands would be for the
@item @code{%1}
@tab @code{$2}
@tab @code{2}
@item @code{%2}
@tab @code{$.L2}
@tab @code{OFFSET FLAT:.L2}
@item @code{%3}
@tab @code{$.L3}
@tab @code{OFFSET FLAT:.L3}
@end multitable
The table below shows the list of supported modifiers and their effects.
@multitable {Modifier} {Print the opcode suffix for the size of th} {Operand} {@samp{att}} {@samp{intel}}
@headitem Modifier @tab Description @tab Operand @tab @samp{att} @tab @samp{intel}
@item @code{z}
@tab Print the opcode suffix for the size of the current integer operand (one of @code{b}/@code{w}/@code{l}/@code{q}).
@tab @code{%z0}
@tab @code{l}
@tab
@item @code{a}
@tab Print an absolute memory reference.
@tab @code{%A0}
@tab @code{*%rax}
@tab @code{rax}
@item @code{b}
@tab Print the QImode name of the register.
@tab @code{%b0}
@tab @code{%al}
@tab @code{al}
@item @code{h}
@tab Print the QImode name for a ``high'' register.
@tab @code{%h0}
@tab @code{%ah}
@tab @code{ah}
@item @code{w}
@tab Print the HImode name of the register.
@tab @code{%w0}
@tab @code{%ax}
@tab @code{ax}
@item @code{k}
@tab Print the SImode name of the register.
@tab @code{%k0}
@tab @code{%eax}
@tab @code{eax}
@item @code{q}
@tab Print the DImode name of the register.
@tab @code{%q0}
@tab @code{%rax}
@tab @code{rax}
@item @code{l}
@tab Print the label name with no punctuation.
@tab @code{%l2}
@tab @code{.L2}
@tab @code{.L2}
@item @code{c}
@tab Require a constant operand and print the constant expression with no punctuation.
@tab @code{%c1}
@tab @code{2}
@tab @code{2}
@item @code{E}
@tab Print the address in Double Integer (DImode) mode (8 bytes) when the target is 64-bit.
Otherwise mode is unspecified (VOIDmode).
@tab @code{%E1}
@tab @code{%(rax)}
@tab @code{[rax]}
@item @code{h}
@tab Print the QImode name for a ``high'' register.
@tab @code{%h0}
@tab @code{%ah}
@tab @code{ah}
@item @code{H}
@tab Add 8 bytes to an offsettable memory reference. Useful when accessing the
high 8 bytes of SSE values. For a memref in (%rax), it generates
@tab @code{%H0}
@tab @code{8(%rax)}
@tab @code{8[rax]}
@item @code{k}
@tab Print the SImode name of the register.
@tab @code{%k0}
@tab @code{%eax}
@tab @code{eax}
@item @code{l}
@tab Print the label name with no punctuation.
@tab @code{%l3}
@tab @code{.L3}
@tab @code{.L3}
@item @code{p}
@tab Print raw symbol name (without syntax-specific prefixes).
@tab @code{%p2}
@tab @code{42}
@tab @code{42}
@item @code{P}
@tab If used for a function, print the PLT suffix and generate PIC code.
For example, emit @code{foo@@PLT} instead of 'foo' for the function
foo(). If used for a constant, drop all syntax-specific prefixes and
issue the bare constant. See @code{p} above.
@item @code{q}
@tab Print the DImode name of the register.
@tab @code{%q0}
@tab @code{%rax}
@tab @code{rax}
@item @code{w}
@tab Print the HImode name of the register.
@tab @code{%w0}
@tab @code{%ax}
@tab @code{ax}
@item @code{z}
@tab Print the opcode suffix for the size of the current integer operand (one of @code{b}/@code{w}/@code{l}/@code{q}).
@tab @code{%z0}
@tab @code{l}
@tab
@end multitable
@code{V} is a special modifier which prints the name of the full integer