From 0670a7b65b0ce122c9f415ac7ae78e015a52a30a Mon Sep 17 00:00:00 2001 From: Peter Maydell Date: Tue, 15 Feb 2011 13:44:42 +0000 Subject: target-arm: Fix signed VRSHL by large shift counts Correctly handle VRSHL of signed values by a shift count of the width of the data type or larger, which must be special-cased in the rshl_s* helper functions. Signed-off-by: Peter Maydell Signed-off-by: Aurelien Jarno --- target-arm/neon_helper.c | 17 +++-------------- 1 file changed, 3 insertions(+), 14 deletions(-) (limited to 'target-arm/neon_helper.c') diff --git a/target-arm/neon_helper.c b/target-arm/neon_helper.c index a32a2c8..0ddfe6d 100644 --- a/target-arm/neon_helper.c +++ b/target-arm/neon_helper.c @@ -543,14 +543,9 @@ uint64_t HELPER(neon_shl_s64)(uint64_t valop, uint64_t shiftop) #define NEON_FN(dest, src1, src2) do { \ int8_t tmp; \ tmp = (int8_t)src2; \ - if (tmp >= (ssize_t)sizeof(src1) * 8) { \ + if ((tmp >= (ssize_t)sizeof(src1) * 8) \ + || (tmp <= -(ssize_t)sizeof(src1) * 8)) { \ dest = 0; \ - } else if (tmp < -(ssize_t)sizeof(src1) * 8) { \ - dest = src1 >> (sizeof(src1) * 8 - 1); \ - } else if (tmp == -(ssize_t)sizeof(src1) * 8) { \ - dest = src1 >> (tmp - 1); \ - dest++; \ - dest >>= 1; \ } else if (tmp < 0) { \ dest = (src1 + (1 << (-1 - tmp))) >> -tmp; \ } else { \ @@ -584,14 +579,8 @@ uint64_t HELPER(neon_rshl_s64)(uint64_t valop, uint64_t shiftop) { int8_t shift = (int8_t)shiftop; int64_t val = valop; - if (shift >= 64) { + if ((shift >= 64) || (shift <= -64)) { val = 0; - } else if (shift < -64) { - val >>= 63; - } else if (shift == -63) { - val >>= 63; - val++; - val >>= 1; } else if (shift < 0) { val >>= (-shift - 1); if (val == INT64_MAX) { -- cgit v1.1