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Consider:
package p func f(x int64, s uint) int64 { s1 := s & 63 s2 := 64 - s1 return x >> s2 }
(Extracted from code that does multi-word shifts.)
The compiler should be able to prove that s2 ∈ [0, 64), and thus emit a plain shift, rather than a shift + mask. It does not.
cc @rasky @aclements
The text was updated successfully, but these errors were encountered:
Except that that is not sound. Time for bed.
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Consider:
(Extracted from code that does multi-word shifts.)
The compiler should be able to prove that s2 ∈ [0, 64), and thus emit a plain shift, rather than a shift + mask. It does not.
cc @rasky @aclements
The text was updated successfully, but these errors were encountered: