From 3071eb2848a2e748cfd67e8c897890ce06c69d06 Mon Sep 17 00:00:00 2001
From: "Vladimir N. Makarov" <vmakarov@redhat.com>
Date: Thu, 27 Feb 2025 13:39:04 -0500
Subject: [PATCH] [PR118940][LRA]: Add a test
PR115458 also solves given PR. So the patch adds only a
test case which can be used for testing LRA work aspects different from
PR115458 test case.
gcc/testsuite/ChangeLog:
PR target/118940
* gcc.target/i386/pr118940.c: New test.
---
gcc/testsuite/gcc.target/i386/pr118940.c | 127 +++++++++++++++++++++++
1 file changed, 127 insertions(+)
create mode 100644 gcc/testsuite/gcc.target/i386/pr118940.c
diff --git a/gcc/testsuite/gcc.target/i386/pr118940.c b/gcc/testsuite/gcc.target/i386/pr118940.c
new file mode 100644
index 000000000000..be094310173c
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr118940.c
@@ -0,0 +1,127 @@
+/* { dg-do compile } */
+/* { dg-options "-w -g -Os -march=i386 -mregparm=3 -m32 -fno-PIE" } */
+
+typedef unsigned char uint8_t;
+typedef unsigned int uint32_t;
+typedef unsigned int size_t;
+typedef uint32_t bigint_element_t;
+
+/**
+ * Define a big-integer type
+ *
+ * @v size Number of elements
+ * @ret bigint_t Big integer type
+ */
+ #define bigint_t( size ) \
+ struct { \
+ bigint_element_t element[ (size) ]; \
+ }
+
+/**
+* Determine number of elements required for a big-integer type
+*
+* @v len Maximum length of big integer, in bytes
+* @ret size Number of elements
+*/
+#define bigint_required_size( len ) \
+ ( ( (len) + sizeof ( bigint_element_t ) - 1 ) / \
+ sizeof ( bigint_element_t ) )
+
+/**
+ * Determine number of elements in big-integer type
+ *
+ * @v bigint Big integer
+ * @ret size Number of elements
+ */
+ #define bigint_size( bigint ) \
+ ( sizeof ( *(bigint) ) / sizeof ( (bigint)->element[0] ) )
+
+ /**
+ * Initialise big integer
+ *
+ * @v value Big integer to initialise
+ * @v data Raw data
+ * @v len Length of raw data
+ */
+#define bigint_init( value, data, len ) do { \
+ unsigned int size = bigint_size (value); \
+ bigint_init_raw ( (value)->element, size, (data), (len) ); \
+ } while ( 0 )
+
+
+/**
+ * Calculate temporary working space required for moduluar exponentiation
+ *
+ * @v modulus Big integer modulus
+ * @ret len Length of temporary working space
+ */
+ #define bigint_mod_exp_tmp_len( modulus ) ( { \
+ unsigned int size = bigint_size (modulus); \
+ sizeof ( struct { \
+ bigint_t ( size ) temp[4]; \
+ } ); } )
+
+
+/**
+ * Initialise big integer
+ *
+ * @v value0 Element 0 of big integer to initialise
+ * @v size Number of elements
+ * @v data Raw data
+ * @v len Length of raw data
+ */
+ static inline __attribute__ (( always_inline )) void
+ bigint_init_raw ( uint32_t *value0, unsigned int size,
+ const void *data, size_t len ) {
+ bigint_t ( size ) __attribute__ (( may_alias )) *value =
+ ( ( void * ) value0 );
+ long pad_len = ( sizeof ( *value ) - len );
+ void *discard_D;
+ long discard_c;
+
+ /* Copy raw data in reverse order, padding with zeros */
+ __asm__ __volatile__ ( "\n1:\n\t"
+ "movb -1(%3,%1), %%al\n\t"
+ "stosb\n\t"
+ "loop 1b\n\t"
+ "xorl %%eax, %%eax\n\t"
+ "mov %4, %1\n\t"
+ "rep stosb\n\t"
+ : "=&D" ( discard_D ), "=&c" ( discard_c ),
+ "+m" ( *value )
+ : "r" ( data ), "g" ( pad_len ), "0" ( value0 ),
+ "1" ( len )
+ : "eax" );
+ }
+
+extern void touch (void *, ...);
+extern void touch3 (void *, void *, void *);
+extern void touch2 (void *, void *);
+
+/**
+ * Perform big integer self-tests
+ *
+ */
+void bigint_test_exec ( void ) {
+ do{
+ static const uint8_t base_raw[3] = {0};
+ static const uint8_t modulus_raw[3] = {0};
+ static const uint8_t exponent_raw[25] = {0};
+ unsigned int size =
+ bigint_required_size ( sizeof ( base_raw ) );
+ unsigned int exponent_size =
+ bigint_required_size ( sizeof ( exponent_raw ) );
+ bigint_t ( size ) base_temp;
+ bigint_t ( size ) modulus_temp;
+ bigint_t ( exponent_size ) exponent_temp;
+ size_t tmp_len = bigint_mod_exp_tmp_len ( &modulus_temp );
+
+
+ touch ( &base_temp );
+ bigint_init ( &modulus_temp, modulus_raw,
+ sizeof ( modulus_raw ) );
+ bigint_init ( &exponent_temp, exponent_raw,
+ sizeof ( exponent_raw ) );
+ touch3 ( &base_temp, &modulus_temp, &exponent_temp );
+ } while ( 0 );
+}
--
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