[go] test/codegen: add riscv64 checks for conditional subtractions

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Kinson Nee (Gerrit)

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Jul 15, 2026, 10:07:05 PM (6 days ago) Jul 15
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test/codegen: add riscv64 checks for conditional subtractions

Add riscv64 asmcheck coverage for the conditional subtraction cases in condmove.go.

Verify that rva20u64 and rva22u64 keep using the existing SNEZ/NEG/AND/OR sequence. Verify that rva23u64 uses CZERONEZ/CZEROEQZ/OR without the older fallback sequence.
Co-authored-by: YuanSheng <yuan...@isrc.iscas.ac.cn>
Change-Id: I7df5c57e36e57c6309ce0fb0efd2d53bd9e06b76

Change diff

diff --git a/test/codegen/condmove.go b/test/codegen/condmove.go
index 8366961..17d0f99 100644
--- a/test/codegen/condmove.go
+++ b/test/codegen/condmove.go
@@ -857,6 +857,8 @@
const q = 8380417 // 2²³ - 2¹³ + 1
// FIXME: the compiler struggles with Sub32 since it's not intriscified.
x, b := bits.Sub32(a, q, 0)
+ // riscv64/rva20u64,riscv64/rva22u64:"SNEZ" "NEG" "AND" "OR"
+ // riscv64/rva23u64:"CZERONEZ" "CZEROEQZ" "OR" -"SNEZ" -"NEG" -"AND"
return uint32(subtle.ConstantTimeSelect(int(b), int(a), int(x)))
}

@@ -872,5 +874,7 @@
// amd64:"SUB" -"TEST" -"SBB"
x, b := bits.Sub64(uint64(a), q, 0)
// amd64:"CMOV" -"TEST" -"SBB"
+ // riscv64/rva20u64,riscv64/rva22u64:"SNEZ" "NEG" "AND" "OR"
+ // riscv64/rva23u64:"CZERONEZ" "CZEROEQZ" "OR" -"SNEZ" -"NEG" -"AND"
return uint32(subtle.ConstantTimeSelect(int(b), int(a), int(x)))
}

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    Meng Zhuo (Gerrit)

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    Meng Zhuo (Gerrit)

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    Kinson Nee (Gerrit)

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    Thanks. I think this is OK for the rva23u64 asmcheck because RVA23U64 mandates both Zkt and Zicond. The Zicond spec gives data-independent timing for CZERO.* when Zkt is implemented, and this test only expects CZERO.* for rva23u64; rva20u64/rva22u64 still check the non-Zicond sequence.

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    I think zicond requires zkt to be const time

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      Commit message:
      test/codegen: add riscv64 checks for conditional subtractions

      Add riscv64 asmcheck coverage for the conditional subtraction cases in condmove.go.

      Verify that rva20u64 and rva22u64 keep using the existing SNEZ/NEG/AND/OR sequence. Verify that rva23u64 uses CZERONEZ/CZEROEQZ/OR without the older fallback sequence.
      Co-authored-by: YuanSheng <yuan...@isrc.iscas.ac.cn>
      Change-Id: I7df5c57e36e57c6309ce0fb0efd2d53bd9e06b76
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