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[PATCH 20/22] target/arm: Implement new VFP fp16 insn VMOVX
From: |
Peter Maydell |
Subject: |
[PATCH 20/22] target/arm: Implement new VFP fp16 insn VMOVX |
Date: |
Mon, 24 Aug 2020 15:29:32 +0100 |
The fp16 extension includes a new instruction VMOVX, which copies the
upper 16 bits of a 32-bit source VFP register into the lower 16
bits of the destination and zeroes the high half of the destination.
Implement it.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
target/arm/vfp-uncond.decode | 3 +++
target/arm/translate-vfp.c.inc | 25 +++++++++++++++++++++++++
2 files changed, 28 insertions(+)
diff --git a/target/arm/vfp-uncond.decode b/target/arm/vfp-uncond.decode
index 39dc8f6373a..8891ab3d549 100644
--- a/target/arm/vfp-uncond.decode
+++ b/target/arm/vfp-uncond.decode
@@ -75,5 +75,8 @@ VCVT 1111 1110 1.11 11 rm:2 .... 1010 op:1 1.0 .... \
VCVT 1111 1110 1.11 11 rm:2 .... 1011 op:1 1.0 .... \
vm=%vm_dp vd=%vd_sp sz=3
+VMOVX 1111 1110 1.11 0000 .... 1010 01 . 0 .... \
+ vd=%vd_sp vm=%vm_sp
+
VINS 1111 1110 1.11 0000 .... 1010 11 . 0 .... \
vd=%vd_sp vm=%vm_sp
diff --git a/target/arm/translate-vfp.c.inc b/target/arm/translate-vfp.c.inc
index bda3dd25136..4b26156eccc 100644
--- a/target/arm/translate-vfp.c.inc
+++ b/target/arm/translate-vfp.c.inc
@@ -3482,3 +3482,28 @@ static bool trans_VINS(DisasContext *s, arg_VINS *a)
tcg_temp_free_i32(rd);
return true;
}
+
+static bool trans_VMOVX(DisasContext *s, arg_VINS *a)
+{
+ TCGv_i32 rm;
+
+ if (!dc_isar_feature(aa32_fp16_arith, s)) {
+ return false;
+ }
+
+ if (s->vec_len != 0 || s->vec_stride != 0) {
+ return false;
+ }
+
+ if (!vfp_access_check(s)) {
+ return true;
+ }
+
+ /* Set Vd to high half of Vm */
+ rm = tcg_temp_new_i32();
+ neon_load_reg32(rm, a->vm);
+ tcg_gen_shri_i32(rm, rm, 16);
+ neon_store_reg32(rm, a->vd);
+ tcg_temp_free_i32(rm);
+ return true;
+}
--
2.20.1
- [PATCH 18/22] target/arm: Implement VFP fp16 VRINT*, (continued)
- [PATCH 18/22] target/arm: Implement VFP fp16 VRINT*, Peter Maydell, 2020/08/24
- [PATCH 19/22] target/arm: Implement new VFP fp16 insn VINS, Peter Maydell, 2020/08/24
- [PATCH 22/22] target/arm: Enable FP16 in '-cpu max', Peter Maydell, 2020/08/24
- [PATCH 17/22] target/arm: Implement VFP fp16 VSEL, Peter Maydell, 2020/08/24
- [PATCH 21/22] target/arm: Implement VFP fp16 VMOV between gp and halfprec registers, Peter Maydell, 2020/08/24
- [PATCH 20/22] target/arm: Implement new VFP fp16 insn VMOVX,
Peter Maydell <=