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[01/18] target/arm: Fix MVE widening/narrowing VLDR/VSTR offset calculation

Message ID 20210628135835.6690-2-peter.maydell@linaro.org
State New
Headers show
Series target/arm: Second slice of MVE implementation | expand

Commit Message

Peter Maydell June 28, 2021, 1:58 p.m. UTC 
In do_ldst(), the calculation of the offset needs to be based on the
size of the memory access, not the size of the elements in the
vector.  This meant we were getting it wrong for the widening and
narrowing variants of the various VLDR and VSTR insns.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 target/arm/translate-mve.c | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

Comments

Richard Henderson June 28, 2021, 3:12 p.m. UTC | #1 
On 6/28/21 6:58 AM, Peter Maydell wrote:
> In do_ldst(), the calculation of the offset needs to be based on the
> size of the memory access, not the size of the elements in the
> vector.  This meant we were getting it wrong for the widening and
> narrowing variants of the various VLDR and VSTR insns.
> 
> Signed-off-by: Peter Maydell<peter.maydell@linaro.org>
> ---
>   target/arm/translate-mve.c | 17 +++++++++--------
>   1 file changed, 9 insertions(+), 8 deletions(-)

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

r~
diff mbox series

Patch

diff --git a/target/arm/translate-mve.c b/target/arm/translate-mve.c
index 67462bdf27d..e9a5442a724 100644
--- a/target/arm/translate-mve.c
+++ b/target/arm/translate-mve.c
@@ -120,7 +120,8 @@  static bool mve_skip_first_beat(DisasContext *s)
     }
 }
 
-static bool do_ldst(DisasContext *s, arg_VLDR_VSTR *a, MVEGenLdStFn *fn)
+static bool do_ldst(DisasContext *s, arg_VLDR_VSTR *a, MVEGenLdStFn *fn,
+                    unsigned msize)
 {
     TCGv_i32 addr;
     uint32_t offset;
@@ -141,7 +142,7 @@  static bool do_ldst(DisasContext *s, arg_VLDR_VSTR *a, MVEGenLdStFn *fn)
         return true;
     }
 
-    offset = a->imm << a->size;
+    offset = a->imm << msize;
     if (!a->a) {
         offset = -offset;
     }
@@ -178,22 +179,22 @@  static bool trans_VLDR_VSTR(DisasContext *s, arg_VLDR_VSTR *a)
         { gen_helper_mve_vstrw, gen_helper_mve_vldrw },
         { NULL, NULL }
     };
-    return do_ldst(s, a, ldstfns[a->size][a->l]);
+    return do_ldst(s, a, ldstfns[a->size][a->l], a->size);
 }
 
-#define DO_VLDST_WIDE_NARROW(OP, SLD, ULD, ST)                  \
+#define DO_VLDST_WIDE_NARROW(OP, SLD, ULD, ST, MSIZE)           \
     static bool trans_##OP(DisasContext *s, arg_VLDR_VSTR *a)   \
     {                                                           \
         static MVEGenLdStFn * const ldstfns[2][2] = {           \
             { gen_helper_mve_##ST, gen_helper_mve_##SLD },      \
             { NULL, gen_helper_mve_##ULD },                     \
         };                                                      \
-        return do_ldst(s, a, ldstfns[a->u][a->l]);              \
+        return do_ldst(s, a, ldstfns[a->u][a->l], MSIZE);       \
     }
 
-DO_VLDST_WIDE_NARROW(VLDSTB_H, vldrb_sh, vldrb_uh, vstrb_h)
-DO_VLDST_WIDE_NARROW(VLDSTB_W, vldrb_sw, vldrb_uw, vstrb_w)
-DO_VLDST_WIDE_NARROW(VLDSTH_W, vldrh_sw, vldrh_uw, vstrh_w)
+DO_VLDST_WIDE_NARROW(VLDSTB_H, vldrb_sh, vldrb_uh, vstrb_h, MO_8)
+DO_VLDST_WIDE_NARROW(VLDSTB_W, vldrb_sw, vldrb_uw, vstrb_w, MO_8)
+DO_VLDST_WIDE_NARROW(VLDSTH_W, vldrh_sw, vldrh_uw, vstrh_w, MO_16)
 
 static bool trans_VDUP(DisasContext *s, arg_VDUP *a)
 {