[Qemu-devel] [PATCH 2/5] tcg/arm: fix cross-endian qemu_st16

[Aurelien Jarno <aurelien@aurel32.net>]

The bswap16 TCG opcode assumes that the high bytes of the temp equal
to 0 before calling it. The ARM backend implementation takes this
assumption to slightly optimize the generated code.

The same implementation is called for implementing the cross-endian
qemu_st16 opcode, where this assumption is not true anymore. One way to
fix that would be to zero the high bytes before calling it. Given the
store instruction just ignore them, it is possible to provide a slightly
more optimized version. With ARMv6+ the rev16 instruction does the work
correctly. For lower ARM versions the patch provides a version which
behaves correctly with non-zero high bytes, but fill them with junk.

Cc: Andrzej Zaborowski <balrogg@gmail.com>
Cc: Peter Maydell <peter.maydell@linaro.org>
Cc: qemu-stable@nongnu.org
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
---
 tcg/arm/tcg-target.c |   20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/tcg/arm/tcg-target.c b/tcg/arm/tcg-target.c
index 6cde512..3191903 100644
--- a/tcg/arm/tcg-target.c
+++ b/tcg/arm/tcg-target.c
@@ -596,6 +596,22 @@ static inline void tcg_out_bswap16(TCGContext *s, int cond, int rd, int rn)
     }
 }
 
+/* swap the two low bytes assuming that the two high input bytes and the
+   two high output bit can hold any value. */
+static inline void tcg_out_bswap16st(TCGContext *s, int cond, int rd, int rn)
+{
+    if (use_armv6_instructions) {
+        /* rev16 */
+        tcg_out32(s, 0x06bf0fb0 | (cond << 28) | (rd << 12) | rn);
+    } else {
+        tcg_out_dat_reg(s, cond, ARITH_MOV,
+                        TCG_REG_R8, 0, rn, SHIFT_IMM_LSR(8));
+        tcg_out_dat_imm(s, cond, ARITH_AND, TCG_REG_R8, TCG_REG_R8, 0xff);
+        tcg_out_dat_reg(s, cond, ARITH_ORR,
+                        rd, TCG_REG_R8, rn, SHIFT_IMM_LSL(8));
+    }
+}
+
 static inline void tcg_out_bswap32(TCGContext *s, int cond, int rd, int rn)
 {
     if (use_armv6_instructions) {
@@ -1347,7 +1363,7 @@ static inline void tcg_out_qemu_st(TCGContext *s, const TCGArg *args, int opc)
         break;
     case 1:
         if (bswap) {
-            tcg_out_bswap16(s, COND_EQ, TCG_REG_R0, data_reg);
+            tcg_out_bswap16st(s, COND_EQ, TCG_REG_R0, data_reg);
             tcg_out_st16_r(s, COND_EQ, TCG_REG_R0, addr_reg, TCG_REG_R1);
         } else {
             tcg_out_st16_r(s, COND_EQ, data_reg, addr_reg, TCG_REG_R1);
@@ -1433,7 +1449,7 @@ static inline void tcg_out_qemu_st(TCGContext *s, const TCGArg *args, int opc)
         break;
     case 1:
         if (bswap) {
-            tcg_out_bswap16(s, COND_AL, TCG_REG_R0, data_reg);
+            tcg_out_bswap16st(s, COND_AL, TCG_REG_R0, data_reg);
             tcg_out_st16_8(s, COND_AL, TCG_REG_R0, addr_reg, 0);
         } else {
             tcg_out_st16_8(s, COND_AL, data_reg, addr_reg, 0);
-- 
1.7.10.4