Use explicit casts for ext8u opcodes, and allow truncation
to happen with the store for st8 opcodes.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 tcg/tci.c | 23 +++++------------------
 1 file changed, 5 insertions(+), 18 deletions(-)

diff --git a/tcg/tci.c b/tcg/tci.c
index fb3c97aaf1..c44a4aec7b 100644
--- a/tcg/tci.c
+++ b/tcg/tci.c
@@ -78,11 +78,6 @@ static int32_t tci_read_reg32s(const tcg_target_ulong *regs, TCGReg index)
 }
 #endif
 
-static uint8_t tci_read_reg8(const tcg_target_ulong *regs, TCGReg index)
-{
-    return (uint8_t)tci_read_reg(regs, index);
-}
-
 static uint16_t tci_read_reg16(const tcg_target_ulong *regs, TCGReg index)
 {
     return (uint16_t)tci_read_reg(regs, index);
@@ -169,14 +164,6 @@ tci_read_r(const tcg_target_ulong *regs, const uint8_t **tb_ptr)
     return value;
 }
 
-/* Read indexed register (8 bit) from bytecode. */
-static uint8_t tci_read_r8(const tcg_target_ulong *regs, const uint8_t **tb_ptr)
-{
-    uint8_t value = tci_read_reg8(regs, **tb_ptr);
-    *tb_ptr += 1;
-    return value;
-}
-
 #if TCG_TARGET_HAS_ext8s_i32 || TCG_TARGET_HAS_ext8s_i64
 /* Read indexed register (8 bit signed) from bytecode. */
 static int8_t tci_read_r8s(const tcg_target_ulong *regs, const uint8_t **tb_ptr)
@@ -550,7 +537,7 @@ uintptr_t QEMU_DISABLE_CFI tcg_qemu_tb_exec(CPUArchState *env,
             tci_write_reg(regs, t0, *(uint32_t *)(t1 + t2));
             break;
         CASE_32_64(st8)
-            t0 = tci_read_r8(regs, &tb_ptr);
+            t0 = tci_read_r(regs, &tb_ptr);
             t1 = tci_read_r(regs, &tb_ptr);
             t2 = tci_read_s32(&tb_ptr);
             *(uint8_t *)(t1 + t2) = t0;
@@ -739,8 +726,8 @@ uintptr_t QEMU_DISABLE_CFI tcg_qemu_tb_exec(CPUArchState *env,
 #if TCG_TARGET_HAS_ext8u_i32
         case INDEX_op_ext8u_i32:
             t0 = *tb_ptr++;
-            t1 = tci_read_r8(regs, &tb_ptr);
-            tci_write_reg(regs, t0, t1);
+            t1 = tci_read_r(regs, &tb_ptr);
+            tci_write_reg(regs, t0, (uint8_t)t1);
             break;
 #endif
 #if TCG_TARGET_HAS_ext16u_i32
@@ -933,8 +920,8 @@ uintptr_t QEMU_DISABLE_CFI tcg_qemu_tb_exec(CPUArchState *env,
 #if TCG_TARGET_HAS_ext8u_i64
         case INDEX_op_ext8u_i64:
             t0 = *tb_ptr++;
-            t1 = tci_read_r8(regs, &tb_ptr);
-            tci_write_reg(regs, t0, t1);
+            t1 = tci_read_r(regs, &tb_ptr);
+            tci_write_reg(regs, t0, (uint8_t)t1);
             break;
 #endif
 #if TCG_TARGET_HAS_ext8s_i64
-- 
2.25.1

Richard Henderson <richard.henderson@linaro.org> writes:

> Use explicit casts for ext8u opcodes, and allow truncation
> to happen with the store for st8 opcodes.
>
> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

I got lost figuring out which access functions messed with tb_ptr and
which didn't but got there in the end...

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>

-- 
Alex Bennée