From: Peter Maydell Date: Fri, 11 Mar 2011 08:12:24 +0000 (+0000) Subject: target-arm: Correct ABD's handling of negative zeroes X-Git-Tag: Tizen_Studio_1.3_Release_p2.3.1~3177 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=9b234d39f0c0a52bbd05f6322bd3378bc44c4526;p=sdk%2Femulator%2Fqemu.git target-arm: Correct ABD's handling of negative zeroes Implement ABD by taking the absolute value of the difference of the operands (as the ARM ARM specifies) rather than by flipping the order of the operands to the subtract based on the results of a comparison. The latter approch gives the wrong answers for some edge cases like negative zero. Signed-off-by: Peter Maydell Signed-off-by: Aurelien Jarno --- diff --git a/target-arm/neon_helper.c b/target-arm/neon_helper.c index 9d54a75ef3..bf324c62b6 100644 --- a/target-arm/neon_helper.c +++ b/target-arm/neon_helper.c @@ -1789,9 +1789,7 @@ uint32_t HELPER(neon_abd_f32)(uint32_t a, uint32_t b) { float32 f0 = make_float32(a); float32 f1 = make_float32(b); - return float32_val((float32_compare_quiet(f0, f1, NFS) == 1) - ? float32_sub(f0, f1, NFS) - : float32_sub(f1, f0, NFS)); + return float32_val(float32_abs(float32_sub(f0, f1, NFS))); } uint32_t HELPER(neon_add_f32)(uint32_t a, uint32_t b)