gcc/ChangeLog:
* doc/extend.texi:Add modifiers to the vector of asm in the doc.
* doc/md.texi:Refine the description of the modifier 'f' in the doc.
---
gcc/doc/extend.texi | 47 +++++++++++++++++++++++++++++++++++++++++++++
gcc/doc/md.texi | 2 +-
2 files changed, 48 insertions(+), 1 deletion(-)
diff --git a/gcc/doc/extend.texi b/gcc/doc/extend.texi
index 32ae15e1d5b..d87a079704c 100644
--- a/gcc/doc/extend.texi
+++ b/gcc/doc/extend.texi
@@ -11820,10 +11820,57 @@ The list below describes the supported modifiers and
their effects for LoongArch
@item @code{d} @tab Same as @code{c}.
@item @code{i} @tab Print the character ''@code{i}'' if the operand is not a
register.
@item @code{m} @tab Same as @code{c}, but the printed value is @code{operand -
1}.
+@item @code{u} @tab Print a LASX register.
+@item @code{w} @tab Print a LSX register.
@item @code{X} @tab Print a constant integer operand in hexadecimal.
@item @code{z} @tab Print the operand in its unmodified form, followed by a
comma.
@end multitable
+References to input and output operands in the assembler template of extended
+asm statements can use modifiers to affect the way the operands are formatted
+in the code output to the assembler. For example, the following code uses the
+'w' modifier for LoongArch:
+
+@example
+test-asm.c:
+
+#include <lsxintrin.h>
+
+__m128i foo (void)
+@{
+__m128i a,b,c;
+__asm__ ("vadd.d %w0,%w1,%w2\n\t"
+ :"=f" (c)
+ :"f" (a),"f" (b));
+
+return c;
+@}
+
+@end example
+
+@noindent
+The compile command for the test case is as follows:
+
+@example
+gcc test-asm.c -mlsx -S -o test-asm.s
+@end example
+
+@noindent
+The assembly statement produces the following assembly code:
+
+@example
+vadd.d $vr0,$vr0,$vr1
+@end example
+
+This is a 128-bit vector addition instruction, @code{c} (referred to in the
+template string as %0) is the output, and @code{a} (%1) and @code{b} (%2) are
+the inputs. @code{__m128i} is a vector data type defined in the file
+@code{lsxintrin.h} (@xref{LoongArch SX Vector Intrinsics}). The symbol '=f'
+represents a constraint using a floating-point register as an output type, and
+the 'f' in the input operand represents a constraint using a floating-point
+register operand, which can refer to the definition of a constraint
+(@xref{Constraints}) in gcc.
+
@anchor{riscvOperandmodifiers}
@subsubsection RISC-V Operand Modifiers
diff --git a/gcc/doc/md.texi b/gcc/doc/md.texi
index 536ce997f01..2274da5ff69 100644
--- a/gcc/doc/md.texi
+++ b/gcc/doc/md.texi
@@ -2881,7 +2881,7 @@ $r1h
@item LoongArch---@file{config/loongarch/constraints.md}
@table @code
@item f
-A floating-point register (if available).
+A floating-point or vector register (if available).
@item k
A memory operand whose address is formed by a base register and
(optionally scaled) index register.
--
2.20.1
