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sim: bfin: handle negative left saturated shifts as ashifts [BZ #18407]

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When handling left saturated ashifts with negative immediates, they
should be treated as right ashifts.  This matches hardware behavior.

Reported-by: Igor Rayak <igorr@gitatechnologies.com>
This commit is contained in:
Mike Frysinger
2015-10-11 03:32:11 -04:00
parent 5fde150fed
commit 3f946aa825
4 changed files with 33 additions and 1 deletions
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5
sim/testsuite/sim/bfin/ChangeLog
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@@ -1,3 +1,8 @@
2015-10-11 Mike Frysinger <vapier@gentoo.org>
PR sim/18407
* ashift_left.s: New test.
2013-12-07 Mike Frysinger <vapier@gentoo.org>
* run-tests.sh: Add +x file mode.

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sim/testsuite/sim/bfin/ashift_left.s Normal file
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@@ -0,0 +1,17 @@
# Blackfin testcase for left ashift
# Dreg = Dreg << imm (S);
# mach: bfin
.include "testutils.inc"
.macro test in:req, shift:req, out:req, opt
imm32 r0, \in;
r1 = r0 >>> \shift \opt;
CHECKREG r1, \out;
.endm
start
test 2, 1, 1, (S);
pass