[Qemu-devel] [PULL 13/31] tcg/aarch64: Implement tcg_out_dupm_vec

[Richard Henderson]

The LD1R instruction does all the work.  Note that the only
useful addressing mode is a base register with no offset.

Signed-off-by: Richard Henderson <address@hidden>
---
 tcg/aarch64/tcg-target.inc.c | 37 ++++++++++++++++++++++++++++++++++--
 1 file changed, 35 insertions(+), 2 deletions(-)

diff --git a/tcg/aarch64/tcg-target.inc.c b/tcg/aarch64/tcg-target.inc.c
index 4a3cfa778a..b4585724d3 100644
--- a/tcg/aarch64/tcg-target.inc.c
+++ b/tcg/aarch64/tcg-target.inc.c
@@ -381,6 +381,9 @@ typedef enum {
     I3207_BLR       = 0xd63f0000,
     I3207_RET       = 0xd65f0000,
 
+    /* AdvSIMD load/store single structure.  */
+    I3303_LD1R      = 0x0d40c000,
+
     /* Load literal for loading the address at pc-relative offset */
     I3305_LDR       = 0x58000000,
     I3305_LDR_v64   = 0x5c000000,
@@ -566,7 +569,14 @@ static inline uint32_t tcg_in32(TCGContext *s)
 #define tcg_out_insn(S, FMT, OP, ...) \
     glue(tcg_out_insn_,FMT)(S, glue(glue(glue(I,FMT),_),OP), ## __VA_ARGS__)
 
-static void tcg_out_insn_3305(TCGContext *s, AArch64Insn insn, int imm19, 
TCGReg rt)
+static void tcg_out_insn_3303(TCGContext *s, AArch64Insn insn, bool q,
+                              TCGReg rt, TCGReg rn, unsigned size)
+{
+    tcg_out32(s, insn | (rt & 0x1f) | (rn << 5) | (size << 10) | (q << 30));
+}
+
+static void tcg_out_insn_3305(TCGContext *s, AArch64Insn insn,
+                              int imm19, TCGReg rt)
 {
     tcg_out32(s, insn | (imm19 & 0x7ffff) << 5 | rt);
 }
@@ -825,7 +835,30 @@ static bool tcg_out_dup_vec(TCGContext *s, TCGType type, 
unsigned vece,
 static bool tcg_out_dupm_vec(TCGContext *s, TCGType type, unsigned vece,
                              TCGReg r, TCGReg base, intptr_t offset)
 {
-    return false;
+    TCGReg temp = TCG_REG_TMP;
+
+    if (offset < -0xffffff || offset > 0xffffff) {
+        tcg_out_movi(s, TCG_TYPE_PTR, temp, offset);
+        tcg_out_insn(s, 3502, ADD, 1, temp, temp, base);
+        base = temp;
+    } else {
+        AArch64Insn add_insn = I3401_ADDI;
+
+        if (offset < 0) {
+            add_insn = I3401_SUBI;
+            offset = -offset;
+        }
+        if (offset & 0xfff000) {
+            tcg_out_insn_3401(s, add_insn, 1, temp, base, offset & 0xfff000);
+            base = temp;
+        }
+        if (offset & 0xfff) {
+            tcg_out_insn_3401(s, add_insn, 1, temp, base, offset & 0xfff);
+            base = temp;
+        }
+    }
+    tcg_out_insn(s, 3303, LD1R, type == TCG_TYPE_V128, r, base, vece);
+    return true;
 }
 
 static void tcg_out_movi(TCGContext *s, TCGType type, TCGReg rd,
-- 
2.17.1