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From: Richard Henderson <richard.henderson@linaro.org>
To: qemu-devel@nongnu.org
Cc: peter.maydell@linaro.org
Subject: [PATCH v2 04/15] target/arm: Remove unnecessary range check for VSHL
Date: Sat,  2 May 2020 15:44:52 -0700	[thread overview]
Message-ID: <20200502224503.2282-5-richard.henderson@linaro.org> (raw)
In-Reply-To: <20200502224503.2282-1-richard.henderson@linaro.org>

In 1dc8425e551, while converting to gvec, I added an extra range check
against the shift count.  This was unnecessary because the encoding of
the shift count produces 0 to the element size - 1.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 target/arm/translate.c | 12 ++----------
 1 file changed, 2 insertions(+), 10 deletions(-)

diff --git a/target/arm/translate.c b/target/arm/translate.c
index f730eb5b75..f082384117 100644
--- a/target/arm/translate.c
+++ b/target/arm/translate.c
@@ -6126,16 +6126,8 @@ static int disas_neon_data_insn(DisasContext *s, uint32_t insn)
                         gen_gvec_sli(size, rd_ofs, rm_ofs, shift,
                                      vec_size, vec_size);
                     } else { /* VSHL */
-                        /* Shifts larger than the element size are
-                         * architecturally valid and results in zero.
-                         */
-                        if (shift >= 8 << size) {
-                            tcg_gen_gvec_dup_imm(size, rd_ofs,
-                                                 vec_size, vec_size, 0);
-                        } else {
-                            tcg_gen_gvec_shli(size, rd_ofs, rm_ofs, shift,
-                                              vec_size, vec_size);
-                        }
+                        tcg_gen_gvec_shli(size, rd_ofs, rm_ofs, shift,
+                                          vec_size, vec_size);
                     }
                     return 0;
                 }
-- 
2.20.1



  parent reply	other threads:[~2020-05-02 22:47 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-02 22:44 [PATCH v2 00/15] target/arm: partial vector cleanup Richard Henderson
2020-05-02 22:44 ` [PATCH v2 01/15] target/arm: Create gen_gvec_[us]sra Richard Henderson
2020-05-02 22:44 ` [PATCH v2 02/15] target/arm: Create gen_gvec_{u,s}{rshr,rsra} Richard Henderson
2020-05-02 22:44 ` [PATCH v2 03/15] target/arm: Create gen_gvec_{sri,sli} Richard Henderson
2020-05-02 22:44 ` Richard Henderson [this message]
2020-05-02 22:44 ` [PATCH v2 05/15] target/arm: Tidy handle_vec_simd_shri Richard Henderson
2020-05-02 22:44 ` [PATCH v2 06/15] target/arm: Wrap vector compare zero GVecGen2 in GVecGen2Fn Richard Henderson
2020-05-02 22:44 ` [PATCH v2 07/15] target/arm: Wrap vector mla/mls GVecGen3 in GVecGen3Fn Richard Henderson
2020-05-02 22:44 ` [PATCH v2 08/15] target/arm: Wrap vector cmtst/ushl/sshl " Richard Henderson
2020-05-02 22:44 ` [PATCH v2 09/15] target/arm: Wrap vector uqadd/sqadd/uqsub/sqsub GVecGen4 " Richard Henderson
2020-05-02 22:44 ` [PATCH v2 10/15] target/arm: Remove fp_status from helper_{recpe, rsqrte}_u32 Richard Henderson
2020-05-02 22:44 ` [PATCH v2 11/15] target/arm: Wrap vector qrdmla/qrdmls in GVecGen3Fn Richard Henderson
2020-05-02 22:45 ` [PATCH v2 12/15] target/arm: Pass pointer to qc to qrdmla/qrdmls Richard Henderson
2020-05-02 22:45 ` [PATCH v2 13/15] target/arm: Clear tail in gvec_fmul_idx_*, gvec_fmla_idx_* Richard Henderson
2020-05-02 22:45 ` [PATCH v2 14/15] target/arm: Vectorize SABD/UABD Richard Henderson
2020-05-02 22:45 ` [PATCH v2 15/15] target/arm: Vectorize SABA/UABA Richard Henderson
2020-05-05 10:38 ` [PATCH v2 00/15] target/arm: partial vector cleanup Peter Maydell
2020-05-05 14:00   ` Richard Henderson

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