From 994b0cf9975486d6082d80f0bff177204fbd56d0 Mon Sep 17 00:00:00 2001 From: Richard Henderson Date: Thu, 10 May 2018 18:10:57 +0100 Subject: [PATCH] target/arm: Implement vector shifted SCVF/UCVF for fp16 While we have some of the scalar paths for *CVF for fp16, we failed to decode the fp16 version of these instructions. Cc: qemu-stable@nongnu.org Signed-off-by: Richard Henderson Message-id: 20180502221552.3873-2-richard.henderson@linaro.org Reviewed-by: Peter Maydell Signed-off-by: Peter Maydell (cherry picked from commit a6117fae4576edfe7a5a5b802a742c33112c0993) Signed-off-by: Michael Roth --- target/arm/translate-a64.c | 33 ++++++++++++++++++++------------- 1 file changed, 20 insertions(+), 13 deletions(-) diff --git a/target/arm/translate-a64.c b/target/arm/translate-a64.c index c91329249d..f0fa6045e4 100644 --- a/target/arm/translate-a64.c +++ b/target/arm/translate-a64.c @@ -7159,13 +7159,26 @@ static void handle_simd_shift_intfp_conv(DisasContext *s, bool is_scalar, int immh, int immb, int opcode, int rn, int rd) { - bool is_double = extract32(immh, 3, 1); - int size = is_double ? MO_64 : MO_32; - int elements; + int size, elements, fracbits; int immhb = immh << 3 | immb; - int fracbits = (is_double ? 128 : 64) - immhb; - if (!extract32(immh, 2, 2)) { + if (immh & 8) { + size = MO_64; + if (!is_scalar && !is_q) { + unallocated_encoding(s); + return; + } + } else if (immh & 4) { + size = MO_32; + } else if (immh & 2) { + size = MO_16; + if (!arm_dc_feature(s, ARM_FEATURE_V8_FP16)) { + unallocated_encoding(s); + return; + } + } else { + /* immh == 0 would be a failure of the decode logic */ + g_assert(immh == 1); unallocated_encoding(s); return; } @@ -7173,20 +7186,14 @@ static void handle_simd_shift_intfp_conv(DisasContext *s, bool is_scalar, if (is_scalar) { elements = 1; } else { - elements = is_double ? 2 : is_q ? 4 : 2; - if (is_double && !is_q) { - unallocated_encoding(s); - return; - } + elements = (8 << is_q) >> size; } + fracbits = (16 << size) - immhb; if (!fp_access_check(s)) { return; } - /* immh == 0 would be a failure of the decode logic */ - g_assert(immh); - handle_simd_intfp_conv(s, rd, rn, elements, !is_u, fracbits, size); }