Co-authored-by: Yang Yujie <yangyu...@loongson.cn>
gcc/ChangeLog:
* config/loongarch/loongarch.cc (loongarch_classify_address):
Add precessint for CONST_INT.
(loongarch_print_operand_reloc): Operand modifier 'c' is supported.
(loongarch_print_operand): Increase the processing of '%c'.
* doc/extend.texi: Adds documents for LoongArch operand modifiers.
And port the public operand modifiers information to this document.
gcc/testsuite/ChangeLog:
* gcc.target/loongarch/tst-asm-const.c: Moved to...
* gcc.target/loongarch/pr107731.c: ...here.
---
V2 -> v3:
1. Correct a clerical error.
2. Adding document for loongarch operand modifiers.
v3 -> v4:
Copy the description of "%c" "%n" "%a" "%l" from gccint.pdf to gcc.pdf.
v4 -> v5:
Move the operand modifiers description of "%c", "%n", "%a", "%l" to the top of
the
x86Operandmodifiers section.
---
gcc/config/loongarch/loongarch.cc | 14 ++
gcc/doc/extend.texi | 135 ++++++++++++------
.../loongarch/{tst-asm-const.c => pr107731.c} | 6 +-
3 files changed, 106 insertions(+), 49 deletions(-)
rename gcc/testsuite/gcc.target/loongarch/{tst-asm-const.c => pr107731.c} (78%)
diff --git a/gcc/config/loongarch/loongarch.cc
b/gcc/config/loongarch/loongarch.cc
index c6b03fcf2f9..cdf190b985e 100644
--- a/gcc/config/loongarch/loongarch.cc
+++ b/gcc/config/loongarch/loongarch.cc
@@ -2075,6 +2075,11 @@ loongarch_classify_address (struct
loongarch_address_info *info, rtx x,
return (loongarch_valid_base_register_p (info->reg, mode, strict_p)
&& loongarch_valid_lo_sum_p (info->symbol_type, mode,
info->offset));
+ case CONST_INT:
+ /* Small-integer addresses don't occur very often, but they
+ are legitimate if $r0 is a valid base register. */
+ info->type = ADDRESS_CONST_INT;
+ return IMM12_OPERAND (INTVAL (x));
default:
return false;
@@ -4933,6 +4938,7 @@ loongarch_print_operand_reloc (FILE *file, rtx op, bool
hi64_part,
'A' Print a _DB suffix if the memory model requires a release.
'b' Print the address of a memory operand, without offset.
+ 'c' Print an integer.
'C' Print the integer branch condition for comparison OP.
'd' Print CONST_INT OP in decimal.
'F' Print the FPU branch condition for comparison OP.
@@ -4979,6 +4985,14 @@ loongarch_print_operand (FILE *file, rtx op, int letter)
fputs ("_db", file);
break;
+ case 'c':
+ if (CONST_INT_P (op))
+ fprintf (file, HOST_WIDE_INT_PRINT_DEC, INTVAL (op));
+ else
+ output_operand_lossage ("unsupported operand for code '%c'", letter);
+
+ break;
+
case 'C':
loongarch_print_int_branch_condition (file, code, letter);
break;
diff --git a/gcc/doc/extend.texi b/gcc/doc/extend.texi
index 1103e9936f7..256811cb8f5 100644
--- a/gcc/doc/extend.texi
+++ b/gcc/doc/extend.texi
@@ -10402,8 +10402,10 @@ ensures that modifying @var{a} does not affect the
address referenced by
is undefined if @var{a} is modified before using @var{b}.
@code{asm} supports operand modifiers on operands (for example @samp{%k2}
-instead of simply @samp{%2}). Typically these qualifiers are hardware
-dependent. The list of supported modifiers for x86 is found at
+instead of simply @samp{%2}). @ref{GenericOperandmodifiers,
+Generic Operand modifiers} lists the modifiers that are available
+on all targets. Other modifiers are hardware dependent.
+For example, the list of supported modifiers for x86 is found at
@ref{x86Operandmodifiers,x86 Operand modifiers}.
If the C code that follows the @code{asm} makes no use of any of the output
@@ -10671,8 +10673,10 @@ optimizers may discard the @code{asm} statement as
unneeded
(see @ref{Volatile}).
@code{asm} supports operand modifiers on operands (for example @samp{%k2}
-instead of simply @samp{%2}). Typically these qualifiers are hardware
-dependent. The list of supported modifiers for x86 is found at
+instead of simply @samp{%2}). @ref{GenericOperandmodifiers,
+Generic Operand modifiers} lists the modifiers that are available
+on all targets. Other modifiers are hardware dependent.
+For example, the list of supported modifiers for x86 is found at
@ref{x86Operandmodifiers,x86 Operand modifiers}.
In this example using the fictitious @code{combine} instruction, the
@@ -11024,9 +11028,8 @@ lab:
@}
@end example
-@anchor{x86Operandmodifiers}
-@subsubsection x86 Operand Modifiers
-
+@anchor{GenericOperandmodifiers}
+@subsubsection Generic Operand Modifiers
References to input, output, and goto operands in the assembler template
of extended @code{asm} statements can use
modifiers to affect the way the operands are formatted in
@@ -11045,48 +11048,31 @@ These modifiers generate this assembler code:
xchg %ah, %al
@end example
-The rest of this discussion uses the following code for illustrative purposes.
-
-@example
-int main()
-@{
- int iInt = 1;
-
-top:
-
- asm volatile goto ("some assembler instructions here"
- : /* No outputs. */
- : "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:
+@noindent
+The following table shows the modifiers supported by generic and their effects
-@multitable {Operand} {$.L2} {OFFSET FLAT:.L2}
-@headitem Operand @tab @samp{att} @tab @samp{intel}
-@item @code{%0}
-@tab @code{%eax}
-@tab @code{eax}
-@item @code{%1}
-@tab @code{$2}
-@tab @code{2}
-@item @code{%3}
-@tab @code{$.L3}
-@tab @code{OFFSET FLAT:.L3}
-@item @code{%4}
-@tab @code{$8}
-@tab @code{8}
-@item @code{%5}
-@tab @code{%xmm0}
-@tab @code{xmm0}
-@item @code{%7}
-@tab @code{$0}
-@tab @code{0}
+@multitable {Modifier} {Print the opcode suffix for the size of th} {Operand}
+@headitem Modifier @tab Description @tab Operand
+@item @code{c}
+@tab Require a constant operand and print the constant expression with no
punctuation.
+@tab @code{%c0}
+@item @code{n}
+@tab Like @samp{%c} except that the value of the constant is negated before
printing.
+@tab @code{%n0}
+@item @code{a}
+@tab Substitutes a memory reference, with the actual operand treated as the
address.
+This may be useful when outputting a ``load address'' instruction, because
+often the assembler syntax for such an instruction requires you to write the
+operand as if it were a memory reference.
+@tab @code{%a0}
+@item @code{l}
+@tab Print the label name with no punctuation.
+@tab @code{%l0}
@end multitable
+@anchor{x86Operandmodifiers}
+@subsubsection x86 Operand Modifiers
+
The table below shows the list of supported modifiers and their effects.
@multitable {Modifier} {Print the opcode suffix for the size of th} {Operand}
{@samp{att}} {@samp{intel}}
@@ -11243,6 +11229,48 @@ delimiterprint the opcode suffix of s.
@tab Like @code{z}, with special suffixes for x87 instructions.
@end multitable
+The rest of this discussion uses the following code for illustrative purposes.
+
+@example
+int main()
+@{
+ int iInt = 1;
+
+top:
+
+ asm volatile goto ("some assembler instructions here"
+ : /* No outputs. */
+ : "q" (iInt), "X" (sizeof(unsigned char) + 1), "i" (42)
+ : /* No clobbers. */
+ : top);
+@}
+@end example
+
+With no modifiers, this is what the output from the operands would be
+for the @samp{att} and @samp{intel} dialects of assembler:
+
+@multitable {Operand} {$.L2} {OFFSET FLAT:.L2}
+@headitem Operand @tab @samp{att} @tab @samp{intel}
+@item @code{%0}
+@tab @code{%eax}
+@tab @code{eax}
+@item @code{%1}
+@tab @code{$2}
+@tab @code{2}
+@item @code{%3}
+@tab @code{$.L3}
+@tab @code{OFFSET FLAT:.L3}
+@item @code{%4}
+@tab @code{$8}
+@tab @code{8}
+@item @code{%5}
+@tab @code{%xmm0}
+@tab @code{xmm0}
+@item @code{%7}
+@tab @code{$0}
+@tab @code{0}
+@end multitable
+
@anchor{x86floatingpointasmoperands}
@subsubsection x86 Floating-Point @code{asm} Operands
@@ -11374,6 +11402,21 @@ constant. Used to select the specified bit position.
@item @code{x} @tab Equivialent to @code{X}, but only for pointers.
@end multitable
+@anchor{loongarchOperandmodifiers}
+@subsubsection LoongArch Operand Modifiers
+
+The list below describes the supported modifiers and their effects for
LoongArch.
+
+@multitable @columnfractions .10 .90
+@headitem Modifier @tab Description
+@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{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
+
+
@lowersections
@include md.texi
@raisesections
diff --git a/gcc/testsuite/gcc.target/loongarch/tst-asm-const.c
b/gcc/testsuite/gcc.target/loongarch/pr107731.c
similarity index 78%
rename from gcc/testsuite/gcc.target/loongarch/tst-asm-const.c
rename to gcc/testsuite/gcc.target/loongarch/pr107731.c
index 2e04b99e301..80d84c48c6e 100644
--- a/gcc/testsuite/gcc.target/loongarch/tst-asm-const.c
+++ b/gcc/testsuite/gcc.target/loongarch/pr107731.c
@@ -1,13 +1,13 @@
-/* Test asm const. */
/* { dg-do compile } */
/* { dg-final { scan-assembler-times "foo:.*\\.long 1061109567.*\\.long 52" 1
} } */
+
int foo ()
{
__asm__ volatile (
"foo:"
"\n\t"
- ".long %a0\n\t"
- ".long %a1\n\t"
+ ".long %c0\n\t"
+ ".long %c1\n\t"
:
:"i"(0x3f3f3f3f), "i"(52)
:
--
2.31.1
