aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorPeter Maydell <peter.maydell@linaro.org>2019-06-13 15:37:41 +0100
committerPeter Maydell <peter.maydell@linaro.org>2019-06-17 15:23:32 +0100
commitb5181cf53547c7fb1b54db6d159c39a1e88f9eb6 (patch)
tree50f3ec890ff48b5237f39a69ea48fca6d8f939cf
parent245f69ada691a5d1d90ec439be9d4bb5d5706ba6 (diff)
downloadrisu-b5181cf53547c7fb1b54db6d159c39a1e88f9eb6.tar.gz
arm.risu: Avoid VTRN with Vd == Vm
The AArch32 VTRN instruction is specified to give an UNKNOWN result if Vd and Vm are the same register; avoid generating this in risu output, as we already do for VUZP and VZIP. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-id: 20190613143741.15128-1-peter.maydell@linaro.org
-rw-r--r--arm.risu3
1 files changed, 2 insertions, 1 deletions
diff --git a/arm.risu b/arm.risu
index 9009e6b..c16d245 100644
--- a/arm.risu
+++ b/arm.risu
@@ -613,7 +613,8 @@ VCLT0 A1 1111 0011 1 d 11 sz:2 01 vd:4 0 f 100 q m 0 vm:4
VABS A1 1111 0011 1 d 11 sz:2 01 vd:4 0 f 110 q m 0 vm:4
VNEG A1 1111 0011 1 d 11 sz:2 01 vd:4 0 f 111 q m 0 vm:4
VSWP A1 1111 0011 1 d 11 sz:2 10 vd:4 00000 q m 0 vm:4
-VTRN A1 1111 0011 1 d 11 sz:2 10 vd:4 00001 q m 0 vm:4
+# d == m gives UNKNOWN results, so avoid it
+VTRN A1 1111 0011 1 d 11 sz:2 10 vd:4 00001 q m 0 vm:4 { ($d != $m) || ($vd != $vm); }
# d == m gives UNKNOWN results, so avoid it
VUZP A1 1111 0011 1 d 11 sz:2 10 vd:4 00010 q m 0 vm:4 { ($d != $m) || ($vd != $vm); }
VZIP A1 1111 0011 1 d 11 sz:2 10 vd:4 00011 q m 0 vm:4 { ($d != $m) || ($vd != $vm); }