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core/crypto/_fiat/field_curve25519: Use multiply to calculate the mask

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Largely for consistency with the generic code, either is valid with Odin
semantics, but this is easier to comprehend.
This commit is contained in:
Yawning Angel
2024-03-17 10:39:10 +09:00
parent b155fdf8c9
commit f9b9521bf0
1 changed files with 1 additions and 1 deletions
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core/crypto/_fiat/field_curve25519/field51.odin
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@@ -599,7 +599,7 @@ fe_set :: proc "contextless" (out1, arg1: ^Tight_Field_Element) {
@(optimization_mode="none")
fe_cond_swap :: #force_no_inline proc "contextless" (out1, out2: ^Tight_Field_Element, arg1: int) {
mask := -u64(arg1)
mask := (u64(arg1) * 0xffffffffffffffff)
x := (out1[0] ~ out2[0]) & mask
x1, y1 := out1[0] ~ x, out2[0] ~ x
x = (out1[1] ~ out2[1]) & mask