tcg: Introduce tcg_out_movext2

This is common code in most qemu_{ld,st} slow paths, moving two
registers when there may be overlap between sources and destinations.
At present, this is only used by 32-bit hosts for 64-bit data,
but will shortly be used for more than that.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

1 files changed, 18 insertions, 26 deletions

diff --git a/tcg/arm/tcg-target.c.inc b/tcg/arm/tcg-target.c.inc
index 8d769ca..83c818a 100644
--- a/tcg/arm/tcg-target.c.inc
+++ b/tcg/arm/tcg-target.c.inc
@@ -1545,7 +1545,7 @@ static void add_qemu_ldst_label(TCGContext *s, bool is_ld, MemOpIdx oi,
 
 static bool tcg_out_qemu_ld_slow_path(TCGContext *s, TCGLabelQemuLdst *lb)
 {
-    TCGReg argreg, datalo, datahi;
+    TCGReg argreg;
     MemOpIdx oi = lb->oi;
     MemOp opc = get_memop(oi);
 
@@ -1565,22 +1565,16 @@ static bool tcg_out_qemu_ld_slow_path(TCGContext *s, TCGLabelQemuLdst *lb)
     /* Use the canonical unsigned helpers and minimize icache usage. */
     tcg_out_call_int(s, qemu_ld_helpers[opc & MO_SIZE]);
 
-    datalo = lb->datalo_reg;
-    datahi = lb->datahi_reg;
     if ((opc & MO_SIZE) == MO_64) {
-        if (datalo != TCG_REG_R1) {
-            tcg_out_mov_reg(s, COND_AL, datalo, TCG_REG_R0);
-            tcg_out_mov_reg(s, COND_AL, datahi, TCG_REG_R1);
-        } else if (datahi != TCG_REG_R0) {
-            tcg_out_mov_reg(s, COND_AL, datahi, TCG_REG_R1);
-            tcg_out_mov_reg(s, COND_AL, datalo, TCG_REG_R0);
-        } else {
-            tcg_out_mov_reg(s, COND_AL, TCG_REG_TMP, TCG_REG_R0);
-            tcg_out_mov_reg(s, COND_AL, datahi, TCG_REG_R1);
-            tcg_out_mov_reg(s, COND_AL, datalo, TCG_REG_TMP);
-        }
+        TCGMovExtend ext[2] = {
+            { .dst = lb->datalo_reg, .dst_type = TCG_TYPE_I32,
+              .src = TCG_REG_R0, .src_type = TCG_TYPE_I32, .src_ext = MO_UL },
+            { .dst = lb->datahi_reg, .dst_type = TCG_TYPE_I32,
+              .src = TCG_REG_R1, .src_type = TCG_TYPE_I32, .src_ext = MO_UL },
+        };
+        tcg_out_movext2(s, &ext[0], &ext[1], TCG_REG_TMP);
     } else {
-        tcg_out_movext(s, TCG_TYPE_I32, datalo,
+        tcg_out_movext(s, TCG_TYPE_I32, lb->datalo_reg,
                        TCG_TYPE_I32, opc & MO_SSIZE, TCG_REG_R0);
     }
 
@@ -1663,17 +1657,15 @@ static bool tcg_out_fail_alignment(TCGContext *s, TCGLabelQemuLdst *l)
 
     if (TARGET_LONG_BITS == 64) {
         /* 64-bit target address is aligned into R2:R3. */
-        if (l->addrhi_reg != TCG_REG_R2) {
-            tcg_out_mov(s, TCG_TYPE_I32, TCG_REG_R2, l->addrlo_reg);
-            tcg_out_mov(s, TCG_TYPE_I32, TCG_REG_R3, l->addrhi_reg);
-        } else if (l->addrlo_reg != TCG_REG_R3) {
-            tcg_out_mov(s, TCG_TYPE_I32, TCG_REG_R3, l->addrhi_reg);
-            tcg_out_mov(s, TCG_TYPE_I32, TCG_REG_R2, l->addrlo_reg);
-        } else {
-            tcg_out_mov(s, TCG_TYPE_I32, TCG_REG_R1, TCG_REG_R2);
-            tcg_out_mov(s, TCG_TYPE_I32, TCG_REG_R2, TCG_REG_R3);
-            tcg_out_mov(s, TCG_TYPE_I32, TCG_REG_R3, TCG_REG_R1);
-        }
+        TCGMovExtend ext[2] = {
+            { .dst = TCG_REG_R2, .dst_type = TCG_TYPE_I32,
+              .src = l->addrlo_reg,
+              .src_type = TCG_TYPE_I32, .src_ext = MO_UL },
+            { .dst = TCG_REG_R3, .dst_type = TCG_TYPE_I32,
+              .src = l->addrhi_reg,
+              .src_type = TCG_TYPE_I32, .src_ext = MO_UL },
+        };
+        tcg_out_movext2(s, &ext[0], &ext[1], TCG_REG_TMP);
     } else {
         tcg_out_mov(s, TCG_TYPE_I32, TCG_REG_R1, l->addrlo_reg);
     }