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tcg/tci: Remove tci_read_r16 

Use explicit casts for ext16u opcodes, and allow truncation
to happen with the store for st16 opcodes, and with the call
for bswap16 opcodes.

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2021-01-29 11:26:34 -10:00
parent 9758c8cbbd
commit 0dd0170cb1
1 changed files with 7 additions and 21 deletions
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28
tcg/tci.c
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@ -71,11 +71,6 @@ static int32_t tci_read_reg32s(const tcg_target_ulong *regs, TCGReg index)
}
#endif
static uint16_t tci_read_reg16(const tcg_target_ulong *regs, TCGReg index)
{
return (uint16_t)tci_read_reg(regs, index);
}
static uint32_t tci_read_reg32(const tcg_target_ulong *regs, TCGReg index)
{
return (uint32_t)tci_read_reg(regs, index);
@ -157,15 +152,6 @@ tci_read_r(const tcg_target_ulong *regs, const uint8_t **tb_ptr)
return value;
}
/* Read indexed register (16 bit) from bytecode. */
static uint16_t tci_read_r16(const tcg_target_ulong *regs,
const uint8_t **tb_ptr)
{
uint16_t value = tci_read_reg16(regs, **tb_ptr);
*tb_ptr += 1;
return value;
}
#if TCG_TARGET_HAS_ext16s_i32 || TCG_TARGET_HAS_ext16s_i64
/* Read indexed register (16 bit signed) from bytecode. */
static int16_t tci_read_r16s(const tcg_target_ulong *regs,
@ -509,7 +495,7 @@ uintptr_t QEMU_DISABLE_CFI tcg_qemu_tb_exec(CPUArchState *env,
*(uint8_t *)(t1 + t2) = t0;
break;
CASE_32_64(st16)
t0 = tci_read_r16(regs, &tb_ptr);
t0 = tci_read_r(regs, &tb_ptr);
t1 = tci_read_r(regs, &tb_ptr);
t2 = tci_read_s32(&tb_ptr);
*(uint16_t *)(t1 + t2) = t0;
@ -699,14 +685,14 @@ uintptr_t QEMU_DISABLE_CFI tcg_qemu_tb_exec(CPUArchState *env,
#if TCG_TARGET_HAS_ext16u_i32
case INDEX_op_ext16u_i32:
t0 = *tb_ptr++;
t1 = tci_read_r16(regs, &tb_ptr);
tci_write_reg(regs, t0, t1);
t1 = tci_read_r(regs, &tb_ptr);
tci_write_reg(regs, t0, (uint16_t)t1);
break;
#endif
#if TCG_TARGET_HAS_bswap16_i32
case INDEX_op_bswap16_i32:
t0 = *tb_ptr++;
t1 = tci_read_r16(regs, &tb_ptr);
t1 = tci_read_r(regs, &tb_ptr);
tci_write_reg(regs, t0, bswap16(t1));
break;
#endif
@ -907,8 +893,8 @@ uintptr_t QEMU_DISABLE_CFI tcg_qemu_tb_exec(CPUArchState *env,
#if TCG_TARGET_HAS_ext16u_i64
case INDEX_op_ext16u_i64:
t0 = *tb_ptr++;
t1 = tci_read_r16(regs, &tb_ptr);
tci_write_reg(regs, t0, t1);
t1 = tci_read_r(regs, &tb_ptr);
tci_write_reg(regs, t0, (uint16_t)t1);
break;
#endif
#if TCG_TARGET_HAS_ext32s_i64
@ -930,7 +916,7 @@ uintptr_t QEMU_DISABLE_CFI tcg_qemu_tb_exec(CPUArchState *env,
#if TCG_TARGET_HAS_bswap16_i64
case INDEX_op_bswap16_i64:
t0 = *tb_ptr++;
t1 = tci_read_r16(regs, &tb_ptr);
t1 = tci_read_r(regs, &tb_ptr);
tci_write_reg(regs, t0, bswap16(t1));
break;
#endif