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target-sparc: fix 32-bit truncation in fpackfix

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This is reported by Coverity. The algorithm description at
ftp://ftp.icm.edu.pl/packages/ggi/doc/hw/sparc/Sparc.pdf suggests
that the 32-bit parts of rs2, after the left shift, is treated
as a 64-bit integer. Bits 32 and above are used to do the
saturating truncation.

Backports commit 12a3567c4099be194b44987ac5d7d65b99bcfab7 from qemu
This commit is contained in:
Paolo Bonzini 2018-02-17 19:08:18 -05:00 committed by Lioncash
parent 272e412fc9
commit 1918761803
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 1 additions and 1 deletions
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2
qemu/target-sparc/vis_helper.c
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@ -447,7 +447,7 @@ uint32_t helper_fpackfix(uint64_t gsr, uint64_t rs2)
for (word = 0; word < 2; word++) {
uint32_t val;
int32_t src = rs2 >> (word * 32);
int64_t scaled = src << scale;
int64_t scaled = (int64_t)src << scale;
int64_t from_fixed = scaled >> 16;
val = (from_fixed < -32768 ? -32768 :