[Qemu-devel] [PATCH 1/1] Fix conversion from uint64 to float128

[Petr Tesarik <ptesarik@suse.com>]

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
Signed-off-by: Petr Tesarik <ptesarik@suse.com>
---
 fpu/softfloat.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fpu/softfloat.c b/fpu/softfloat.c
index 70e0c40a1c..386805475b 100644
--- a/fpu/softfloat.c
+++ b/fpu/softfloat.c
@@ -3139,7 +3139,7 @@ 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);
 }
 
 
-- 
2.13.6