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Re: [PATCH] target/arm: Fix SVE STR increment


From: Richard Henderson
Subject: Re: [PATCH] target/arm: Fix SVE STR increment
Date: Tue, 31 Oct 2023 07:08:27 -0700
User-agent: Mozilla Thunderbird

On 10/31/23 03:52, Peter Maydell wrote:
On Mon, 30 Oct 2023 at 19:04, Richard Henderson
<richard.henderson@linaro.org> wrote:

The previous change missed updating one of the increments.

Cc: qemu-stable@nongnu.org
Fixes: e6dd5e782be ("target/arm: Use tcg_gen_qemu_{ld, st}_i128 in gen_sve_{ld, 
st}r")
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
  target/arm/tcg/translate-sve.c | 2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/target/arm/tcg/translate-sve.c b/target/arm/tcg/translate-sve.c
index 7b39962f20..fc4220114d 100644
--- a/target/arm/tcg/translate-sve.c
+++ b/target/arm/tcg/translate-sve.c
@@ -4294,7 +4294,7 @@ void gen_sve_str(DisasContext *s, TCGv_ptr base, int vofs,
          t0 = tcg_temp_new_i64();
          t1 = tcg_temp_new_i64();
          t16 = tcg_temp_new_i128();
-        for (i = 0; i < len_align; i += 8) {
+        for (i = 0; i < len_align; i += 16) {
              tcg_gen_ld_i64(t0, base, vofs + i);
              tcg_gen_ld_i64(t1, base, vofs + i + 8);
              tcg_gen_concat_i64_i128(t16, t0, t1);
--

This fixes the test case I have for vector lengths of 64 bytes
and below, but vector lengths above that (eg 128 bytes) still
misbehave in a different way (only every other set of 8 bytes
gets stored). Presumably that's a different bug somewhere else?

Oh yes -- enable-debug yields

qemu-aarch64: ../src/tcg/tcg-op-ldst.c:712: tcg_gen_qemu_st_i128_chk: Assertion `(memop & MO_SIZE) == MO_128' failed.


r~




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