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Yawning Angel
d72db2698b
Recent LLVM is getting smart to the point where the optimizer can change a traditional constant-time conditional swap into a pointer swap. Ensure that this does not happen by force-disabling optimization. Additionally, disable inlining the relevant routines such that manual inspection in optimized builds is still reasonably easy to do.
27 lines
640 B
Odin
27 lines
640 B
Odin
package fiat
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// This package provides various helpers and types common to all of the
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// fiat-crypto derived backends.
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// This code only works on a two's complement system.
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#assert((-1 & 3) == 3)
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u1 :: distinct u8
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i1 :: distinct i8
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@(optimization_mode="none")
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cmovznz_u64 :: proc "contextless" (arg1: u1, arg2, arg3: u64) -> (out1: u64) {
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x1 := (u64(arg1) * 0xffffffffffffffff)
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x2 := ((x1 & arg3) | ((~x1) & arg2))
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out1 = x2
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return
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}
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@(optimization_mode="none")
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cmovznz_u32 :: proc "contextless" (arg1: u1, arg2, arg3: u32) -> (out1: u32) {
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x1 := (u32(arg1) * 0xffffffff)
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x2 := ((x1 & arg3) | ((~x1) & arg2))
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out1 = x2
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return
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}
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