diff mbox series

[10/11] target/arm: Fix decode of align in VLDST_single

Message ID 20201125040642.2339476-11-richard.henderson@linaro.org
State New
Headers show
Series target/arm: enforce alignment | expand

Commit Message

Richard Henderson Nov. 25, 2020, 4:06 a.m. UTC 
The encoding of size = 2 and size = 3 had the incorrect decode
for align, overlapping the stride field.  This error was hidden
by what should have been unnecessary masking in translate.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 target/arm/neon-ls.decode       | 4 ++--
 target/arm/translate-neon.c.inc | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

Comments

Peter Maydell Dec. 1, 2020, 2:09 p.m. UTC | #1 
On Wed, 25 Nov 2020 at 04:12, Richard Henderson
<richard.henderson@linaro.org> wrote:
>
> The encoding of size = 2 and size = 3 had the incorrect decode
> for align, overlapping the stride field.  This error was hidden
> by what should have been unnecessary masking in translate.
>
> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
> ---
>  target/arm/neon-ls.decode       | 4 ++--
>  target/arm/translate-neon.c.inc | 4 ++--
>  2 files changed, 4 insertions(+), 4 deletions(-)

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>

thanks
-- PMM
diff mbox series

Patch

diff --git a/target/arm/neon-ls.decode b/target/arm/neon-ls.decode
index c17f5019e3..0a2a0e15db 100644
--- a/target/arm/neon-ls.decode
+++ b/target/arm/neon-ls.decode
@@ -46,7 +46,7 @@  VLD_all_lanes  1111 0100 1 . 1 0 rn:4 .... 11 n:2 size:2 t:1 a:1 rm:4 \
 
 VLDST_single   1111 0100 1 . l:1 0 rn:4 .... 00 n:2 reg_idx:3 align:1 rm:4 \
                vd=%vd_dp size=0 stride=1
-VLDST_single   1111 0100 1 . l:1 0 rn:4 .... 01 n:2 reg_idx:2 align:2 rm:4 \
+VLDST_single   1111 0100 1 . l:1 0 rn:4 .... 01 n:2 reg_idx:2 . align:1 rm:4 \
                vd=%vd_dp size=1 stride=%imm1_5_p1
-VLDST_single   1111 0100 1 . l:1 0 rn:4 .... 10 n:2 reg_idx:1 align:3 rm:4 \
+VLDST_single   1111 0100 1 . l:1 0 rn:4 .... 10 n:2 reg_idx:1 . align:2 rm:4 \
                vd=%vd_dp size=2 stride=%imm1_6_p1
diff --git a/target/arm/translate-neon.c.inc b/target/arm/translate-neon.c.inc
index c4be019d9c..330b5fc7b0 100644
--- a/target/arm/translate-neon.c.inc
+++ b/target/arm/translate-neon.c.inc
@@ -616,7 +616,7 @@  static bool trans_VLDST_single(DisasContext *s, arg_VLDST_single *a)
     switch (nregs) {
     case 1:
         if (((a->align & (1 << a->size)) != 0) ||
-            (a->size == 2 && ((a->align & 3) == 1 || (a->align & 3) == 2))) {
+            (a->size == 2 && (a->align == 1 || a->align == 2))) {
             return false;
         }
         break;
@@ -631,7 +631,7 @@  static bool trans_VLDST_single(DisasContext *s, arg_VLDST_single *a)
         }
         break;
     case 4:
-        if ((a->size == 2) && ((a->align & 3) == 3)) {
+        if (a->size == 2 && a->align == 3) {
             return false;
         }
         break;