43 lines
1.3 KiB
Diff
43 lines
1.3 KiB
Diff
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From ca2f73592e8e74a5328df0a65e0831bc1fc6dd28 Mon Sep 17 00:00:00 2001
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From: Andreas Arnez <arnez@linux.ibm.com>
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Date: Tue, 9 Oct 2018 11:22:27 +0200
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Subject: [PATCH] Bug 399444 s390x: Drop unnecessary check in s390_irgen_VSLDB
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In s390_irgen_VSLDB there was special handling for the case that the
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immediate operand i4 has the value 16, which would mean that the result v1
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were a full copy of the third operand v3. However, this is impossible
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because i4 can only assume values from 0 to 15; thus the special handling
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can be removed.
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---
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VEX/priv/guest_s390_toIR.c | 13 ++++---------
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1 file changed, 4 insertions(+), 9 deletions(-)
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diff --git a/VEX/priv/guest_s390_toIR.c b/VEX/priv/guest_s390_toIR.c
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index c594ad51b..60b608138 100644
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--- a/VEX/priv/guest_s390_toIR.c
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+++ b/VEX/priv/guest_s390_toIR.c
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@@ -17400,16 +17400,11 @@ s390_irgen_VSLDB(UChar v1, UChar v2, UChar v3, UChar i4)
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{
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UChar imm = i4 & 0b00001111;
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- if (imm == 0)
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- {
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+ if (imm == 0) {
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+ /* Just copy v2. */
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put_vr_qw(v1, get_vr_qw(v2));
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- }
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- else if (imm == 16)
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- {
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- put_vr_qw(v1, get_vr_qw(v3));
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- }
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- else
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- {
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+ } else {
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+ /* Concatenate v2's tail with v3's head. */
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put_vr_qw(v1,
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binop(Iop_OrV128,
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binop(Iop_ShlV128, get_vr_qw(v2), mkU8(imm * 8)),
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--
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2.20.1
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