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fpu/softfloat: Fix conversion from uint64 to float128 

The significand is passed to normalizeRoundAndPackFloat128() as high
first, low second. The current code passes the integer first, so the
result is incorrectly shifted left by 64 bits.

This bug affects the emulation of s390x instruction CXLGBR (convert
from logical 64-bit binary-integer operand to extended BFP result).

Cc: qemu-stable@nongnu.org
Tested-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Petr Tesarik <ptesarik@suse.com>
Message-Id: <20180511071052.1443-1-ptesarik@suse.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
stable-3.0
Petr Tesarik 2018-05-11 09:10:52 +02:00 committed by Richard Henderson
parent a4207e3b00
commit 6603d50648
1 changed files with 1 additions and 1 deletions
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fpu/softfloat.c
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@ -3147,7 +3147,7 @@ float128 uint64_to_float128(uint64_t a, float_status *status)
if (a == 0) {
return float128_zero;
}
return normalizeRoundAndPackFloat128(0, 0x406E, a, 0, status);
return normalizeRoundAndPackFloat128(0, 0x406E, 0, a, status);
}