[Qemu-devel] [PULL 12/24] target/arm: Use vfp_expand_imm() for AArch32 VFP VMOV_imm

[Peter Maydell <peter.maydell@linaro.org>]

The AArch32 VMOV (immediate) instruction uses the same VFP encoded
immediate format we already handle in vfp_expand_imm().  Use that
function rather than hand-decoding it.

Suggested-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-id: 20190613163917.28589-3-peter.maydell@linaro.org
---
 target/arm/translate-vfp.inc.c | 28 ++++------------------------
 target/arm/vfp.decode          | 10 ++++++----
 2 files changed, 10 insertions(+), 28 deletions(-)

diff --git a/target/arm/translate-vfp.inc.c b/target/arm/translate-vfp.inc.c
index a66084f6e36..8b732761f26 100644
--- a/target/arm/translate-vfp.inc.c
+++ b/target/arm/translate-vfp.inc.c
@@ -1842,7 +1842,7 @@ static bool trans_VMOV_imm_sp(DisasContext *s, arg_VMOV_imm_sp *a)
     uint32_t delta_d = 0;
     int veclen = s->vec_len;
     TCGv_i32 fd;
-    uint32_t n, i, vd;
+    uint32_t vd;
 
     vd = a->vd;
 
@@ -1869,17 +1869,7 @@ static bool trans_VMOV_imm_sp(DisasContext *s, arg_VMOV_imm_sp *a)
         }
     }
 
-    n = (a->imm4h << 28) & 0x80000000;
-    i = ((a->imm4h << 4) & 0x70) | a->imm4l;
-    if (i & 0x40) {
-        i |= 0x780;
-    } else {
-        i |= 0x800;
-    }
-    n |= i << 19;
-
-    fd = tcg_temp_new_i32();
-    tcg_gen_movi_i32(fd, n);
+    fd = tcg_const_i32(vfp_expand_imm(MO_32, a->imm));
 
     for (;;) {
         neon_store_reg32(fd, vd);
@@ -1902,7 +1892,7 @@ static bool trans_VMOV_imm_dp(DisasContext *s, arg_VMOV_imm_dp *a)
     uint32_t delta_d = 0;
     int veclen = s->vec_len;
     TCGv_i64 fd;
-    uint32_t n, i, vd;
+    uint32_t vd;
 
     vd = a->vd;
 
@@ -1934,17 +1924,7 @@ static bool trans_VMOV_imm_dp(DisasContext *s, arg_VMOV_imm_dp *a)
         }
     }
 
-    n = (a->imm4h << 28) & 0x80000000;
-    i = ((a->imm4h << 4) & 0x70) | a->imm4l;
-    if (i & 0x40) {
-        i |= 0x3f80;
-    } else {
-        i |= 0x4000;
-    }
-    n |= i << 16;
-
-    fd = tcg_temp_new_i64();
-    tcg_gen_movi_i64(fd, ((uint64_t)n) << 32);
+    fd = tcg_const_i64(vfp_expand_imm(MO_64, a->imm));
 
     for (;;) {
         neon_store_reg64(fd, vd);
diff --git a/target/arm/vfp.decode b/target/arm/vfp.decode
index ea24365bb4c..a67b3f29ee5 100644
--- a/target/arm/vfp.decode
+++ b/target/arm/vfp.decode
@@ -44,6 +44,8 @@
 %vmov_idx_b     21:1 5:2
 %vmov_idx_h     21:1 6:1
 
+%vmov_imm 16:4 0:4
+
 # VMOV scalar to general-purpose register; note that this does
 # include some Neon cases.
 VMOV_to_gp   ---- 1110 u:1 1.        1 .... rt:4 1011 ... 1 0000 \
@@ -152,10 +154,10 @@ VFM_sp       ---- 1110 1.10 .... .... 1010 . o2:1 . 0 .... \
 VFM_dp       ---- 1110 1.10 .... .... 1011 . o2:1 . 0 .... \
              vm=%vm_dp vn=%vn_dp vd=%vd_dp o1=2
 
-VMOV_imm_sp  ---- 1110 1.11 imm4h:4 .... 1010 0000 imm4l:4 \
-             vd=%vd_sp
-VMOV_imm_dp  ---- 1110 1.11 imm4h:4 .... 1011 0000 imm4l:4 \
-             vd=%vd_dp
+VMOV_imm_sp  ---- 1110 1.11 .... .... 1010 0000 .... \
+             vd=%vd_sp imm=%vmov_imm
+VMOV_imm_dp  ---- 1110 1.11 .... .... 1011 0000 .... \
+             vd=%vd_dp imm=%vmov_imm
 
 VMOV_reg_sp  ---- 1110 1.11 0000 .... 1010 01.0 .... \
              vd=%vd_sp vm=%vm_sp
-- 
2.20.1