/* Area: ffi_call
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Purpose: Check denorm double value.
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Limitations: none.
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PR: PR26483.
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Originator: From the original ffitest.c */
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/* { dg-do run } */
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/* { dg-options "-mieee" { target alpha*-*-* } } */
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#include "ffitest.h"
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#include "float.h"
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typedef union
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{
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double d;
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unsigned char c[sizeof (double)];
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} value_type;
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#define CANARY 0xba
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static double dblit(double d)
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{
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return d;
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}
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int main (void)
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{
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ffi_cif cif;
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ffi_type *args[MAX_ARGS];
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void *values[MAX_ARGS];
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double d;
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value_type result[2];
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unsigned int i;
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args[0] = &ffi_type_double;
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values[0] = &d;
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/* Initialize the cif */
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CHECK(ffi_prep_cif(&cif, FFI_DEFAULT_ABI, 1,
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&ffi_type_double, args) == FFI_OK);
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d = DBL_MIN / 2;
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/* Put a canary in the return array. This is a regression test for
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a buffer overrun. */
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memset(result[1].c, CANARY, sizeof (double));
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ffi_call(&cif, FFI_FN(dblit), &result[0].d, values);
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/* The standard delta check doesn't work for denorms. Since we didn't do
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any arithmetic, we should get the original result back, and hence an
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exact check should be OK here. */
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CHECK(result[0].d == dblit(d));
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/* Check the canary. */
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for (i = 0; i < sizeof (double); ++i)
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CHECK(result[1].c[i] == CANARY);
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exit(0);
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}
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