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From 49a63dbaf3b4296f0b1f8a0e11790cc3455aeec7 Mon Sep 17 00:00:00 2001
From: Lulu Cheng <chenglulu@loongson.cn>
Date: Wed, 18 Jan 2023 11:06:56 +0800
Subject: [PATCH 034/124] LoongArch: Fixed a compilation failure with '%c' in
inline assembly [PR107731].
Co-authored-by: Yang Yujie <yangyujie@loongson.cn>
PR target/107731
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.
Signed-off-by: Peng Fan <fanpeng@loongson.cn>
Signed-off-by: ticat_fp <fanpeng@loongson.cn>
---
gcc/config/loongarch/loongarch.cc | 14 +++++
gcc/doc/extend.texi | 51 +++++++++++++++++--
.../loongarch/{tst-asm-const.c => pr107731.c} | 6 +--
3 files changed, 64 insertions(+), 7 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 e59edc4cd..1a4686f03 100644
--- a/gcc/config/loongarch/loongarch.cc
+++ b/gcc/config/loongarch/loongarch.cc
@@ -2074,6 +2074,11 @@ 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;
@@ -4932,6 +4937,7 @@ 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.
@@ -4978,6 +4984,14 @@ 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 da2840c23..3c101ca89 100644
--- a/gcc/doc/extend.texi
+++ b/gcc/doc/extend.texi
@@ -10414,8 +10414,10 @@ 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
@@ -10683,8 +10685,10 @@ 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
@@ -11036,6 +11040,30 @@ lab:
@}
@end example
+@anchor{GenericOperandmodifiers}
+@subsubsection Generic Operand Modifiers
+@noindent
+The following table shows the modifiers supported by all targets and their effects:
+
+@multitable {Modifier} {Description} {Example}
+@headitem Modifier @tab Description @tab Example
+@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 Substitute 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
@@ -11386,6 +11414,21 @@ 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 2e04b99e3..80d84c48c 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)
:
--
2.33.0
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