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authorJoseph Myers <joseph@codesourcery.com>2016-05-24 21:11:18 +0000
committerJoseph Myers <joseph@codesourcery.com>2016-05-24 21:11:18 +0000
commit5ff81530dd14552a48a8fcb119e5867a1b504cc6 (patch)
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parent7cfcb778c9cc6ad3c3b5ac2dbb2308e81ba3235b (diff)
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Do not raise "inexact" from x86_64 SSE4.1 ceil, floor (bug 15479).
Continuing fixes for ceil and floor functions not to raise the "inexact" exception, this patch fixes the x86_64 SSE4.1 versions. The roundss / roundsd instructions take an immediate operand that determines the rounding mode and whether to raise "inexact"; this just needs bit 3 set to disable "inexact", which this patch does. Remark: we don't have an SSE4.1 version of trunc / truncf (using this instruction with operand 11); I'd expect one to make sense, but of course it should be benchmarked against the existing C code. I'll file a bug in Bugzilla for the lack of such a version. Tested for x86_64. [BZ #15479] * sysdeps/x86_64/fpu/multiarch/s_ceil.S (__ceil_sse41): Set bit 3 of immediate operand to rounding instruction. * sysdeps/x86_64/fpu/multiarch/s_ceilf.S (__ceilf_sse41): Likewise. * sysdeps/x86_64/fpu/multiarch/s_floor.S (__floor_sse41): Likewise. * sysdeps/x86_64/fpu/multiarch/s_floorf.S (__floorf_sse41): Likewise.
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