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tcg: Introduce tcg_zero_i128()

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Extract tcg_zero_i128() helper for re-use.

Inspired-by: James Hilliard <james.hilliard1@gmail.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20260520121644.10835-1-philmd@linaro.org>
[rth: Move the function to tcg-op.c]
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Philippe Mathieu-Daudé
2026-05-19 20:39:21 +02:00
parent c3d9cbb789
commit 0eaa17b313
3 changed files with 13 additions and 4 deletions
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2
include/tcg/tcg-op-common.h
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@@ -18,6 +18,8 @@ TCGv_vaddr tcg_constant_vaddr(uintptr_t val);
TCGv_vec tcg_constant_vec(TCGType type, unsigned vece, int64_t val);
TCGv_vec tcg_constant_vec_matching(TCGv_vec match, unsigned vece, int64_t val);
TCGv_i128 tcg_zero_i128(void);
TCGv_i32 tcg_temp_new_i32(void);
TCGv_i64 tcg_temp_new_i64(void);
TCGv_ptr tcg_temp_new_ptr(void);

5
target/arm/tcg/translate-a64.c
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@@ -4804,13 +4804,10 @@ static bool do_STG(DisasContext *s, arg_ldst_tag *a, bool is_zero, bool is_pair)
if (is_zero) {
TCGv_i64 clean_addr = clean_data_tbi(s, addr);
TCGv_i64 zero64 = tcg_constant_i64(0);
TCGv_i128 zero128 = tcg_temp_new_i128();
TCGv_i128 zero128 = tcg_zero_i128();
int mem_index = get_mem_index(s);
MemOp mop = finalize_memop(s, MO_128 | MO_ALIGN);
tcg_gen_concat_i64_i128(zero128, zero64, zero64);
/* This is 1 or 2 atomic 16-byte operations. */
tcg_gen_qemu_st_i128(zero128, clean_addr, mem_index, mop);
if (is_pair) {

10
tcg/tcg-op.c
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@@ -2475,6 +2475,16 @@ void tcg_gen_concat_i64_i128(TCGv_i128 ret, TCGv_i64 lo, TCGv_i64 hi)
tcg_gen_mov_i64(TCGV128_HIGH(ret), hi);
}
TCGv_i128 tcg_zero_i128(void)
{
TCGv_i64 zero64 = tcg_constant_i64(0);
TCGv_i128 zero128 = tcg_temp_new_i128();
tcg_gen_concat_i64_i128(zero128, zero64, zero64);
return zero128;
}
void tcg_gen_mov_i128(TCGv_i128 dst, TCGv_i128 src)
{
if (dst != src) {