GHC-7.01 and intrinsic operations
Is it possible to make GHC-7.0.1 to generate intrinsic instructions instead of calls to C library to compute trigonometric functions?
main = do a <- readLn print $ sin a
I tried -O -msse2 -fllvm and their combinations. Generating assembly always contains calls for computation of sin Pavel
On 13.12.2010 16:38, Pavel Perikov wrote:
Is it possible to make GHC-7.0.1 to generate intrinsic instructions instead of calls to C library to compute trigonometric functions?
main = do a<- readLn print $ sin a
I tried -O -msse2 -fllvm and their combinations. Generating assembly always contains calls for computation of sin
As far as I remember GHC generates FPU instructions for sinus and friends with its native code generator. However, I noted that LLVM does not do this and always jumps into the C library, although it is documented otherwise.
On 25.12.2010, at 0:20, Henning Thielemann wrote:
On 13.12.2010 16:38, Pavel Perikov wrote:
Is it possible to make GHC-7.0.1 to generate intrinsic instructions instead of calls to C library to compute trigonometric functions?
As far as I remember GHC generates FPU instructions for sinus and friends with its native code generator. However, I noted that LLVM does not do this and always jumps into the C library, although it is documented otherwise. ok, I'm answering my own question here. -fasm indeed uses intrinsic operations in x87 mode. Sadly SSE does not have trigonometric and instructions, though series expansions using SSE2 instructions is usually _faster_ than fsin/fcos. So the behavior is expected.
P.
participants (2)
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Henning Thielemann -
Pavel Perikov