================
@@ -1232,6 +1232,14 @@ class TargetInfo : public TransferrableTargetInfo,
return true;
}
+ /// Returns true, if an operations that depends on rounding mode can be
+ /// implemented without changing FP environment. In this case the rounding
+ /// mode is encoded in the bits of implementing instruction.
----------------
jcranmer-intel wrote:
I'm not sure we actually have any (non-target-specific) IR constructs at the
moment that actually implement static rounding mode. The documentation for
constrained intrinsics says:
> For values other than “round.dynamic” optimization passes may assume that the
> actual runtime rounding mode (as defined in a target-specific manner) matches
> the specified rounding mode, but this is not guaranteed.
It's also the case that static rounding mode may be a less-than-global
decision. X86 AVX512/AVX10 has static rounding mode, which is a subtarget
consideration, but even then, it's not entirely clear that they would be
absolutely preferred.
https://github.com/llvm/llvm-project/pull/89617
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