From 41c5a0f791ef4d9377ec5b952931a1c75df7a815 Mon Sep 17 00:00:00 2001 From: Peter Maydell Date: Thu, 3 Mar 2022 11:37:41 +0000 Subject: [PATCH] target/arm/translate-neon: Simplify align field check for VLD3 For VLD3 (single 3-element structure to one lane), there is no alignment specification and the alignment bits in the instruction must be zero. This is bit [4] for the size=0 and size=1 cases, and bits [5:4] for the size=2 case. We do this check correctly in VLDST_single(), but we write it a bit oddly: in the 'case 3' code we check for bit 0 of a->align (bit [4] of the insn), and then we fall through to the 'case 2' code which checks bit 1 of a->align (bit [5] of the insn) in the size 2 case. Replace this with just checking "is a->align non-zero" for VLD3, which lets us drop the fall-through and put the cases in this switch in numerical order. Signed-off-by: Peter Maydell Reviewed-by: Richard Henderson Tested-by: Richard Henderson Message-id: 20220303113741.2156877-3-peter.maydell@linaro.org --- target/arm/translate-neon.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/target/arm/translate-neon.c b/target/arm/translate-neon.c index 072fdc1e6e..384604c009 100644 --- a/target/arm/translate-neon.c +++ b/target/arm/translate-neon.c @@ -665,16 +665,16 @@ static bool trans_VLDST_single(DisasContext *s, arg_VLDST_single *a) return false; } break; - case 3: - if ((a->align & 1) != 0) { - return false; - } - /* fall through */ case 2: if (a->size == 2 && (a->align & 2) != 0) { return false; } break; + case 3: + if (a->align != 0) { + return false; + } + break; case 4: if (a->size == 2 && a->align == 3) { return false;