372886d2ae
Add a small test to prevent regressions. Tested-by: Thomas Huth <thuth@redhat.com> Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com> Message-Id: <20230724082032.66864-10-iii@linux.ibm.com> Signed-off-by: Thomas Huth <thuth@redhat.com>
33 lines
705 B
C
33 lines
705 B
C
/*
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* Test the CGEBRA instruction.
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include <assert.h>
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#include <fenv.h>
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#include <stdlib.h>
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int main(void)
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{
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float r2 = 1E+300;
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long long r1;
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int cc;
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feclearexcept(FE_ALL_EXCEPT);
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asm("cgebra %[r1],%[m3],%[r2],%[m4]\n"
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"ipm %[cc]\n"
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: [r1] "=r" (r1)
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, [cc] "=r" (cc)
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: [m3] "i" (5) /* round toward 0 */
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, [r2] "f" (r2)
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, [m4] "i" (8) /* bit 0 is set, but must be ignored; XxC is not set */
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: "cc");
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cc >>= 28;
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assert(r1 == 0x7fffffffffffffffLL);
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assert(cc == 3);
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assert(fetestexcept(FE_ALL_EXCEPT) == (FE_INVALID | FE_INEXACT));
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return EXIT_SUCCESS;
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}
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