5e094034d4
We want to disable dominance checks in unreachable code. The is_reachable() check for EBB parameter values was checking if the defining EBB was reachable, not the EBB using the value. This bug showed up in fuzzing and in #213.
46 lines
707 B
Plaintext
46 lines
707 B
Plaintext
test verifier
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function %test() -> i32 { ; Ok
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ebb0:
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v0 = iconst.i32 0
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v1 = iconst.i32 0
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jump ebb2
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ebb2:
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jump ebb4
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ebb4:
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jump ebb2
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ebb3(v2: i32):
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v4 = iadd.i32 v1, v2
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jump ebb9(v4)
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ebb9(v7: i32):
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v9 = iadd.i32 v2, v7
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return v9
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}
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; Using a function argument in an unreachable block is ok.
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function %arg(i32) -> i32 {
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ebb0(v0: i32):
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v1 = iadd_imm v0, 1
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return v1
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ebb1:
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v10 = iadd_imm v0, 10
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return v10
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}
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; Using an EBB argument from an unreachable block is not ok.
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function %arg2(i32) -> i32 {
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ebb0(v0: i32):
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v1 = iadd v0, v10 ; error: uses value arg from non-dominating
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return v1
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ebb1(v10: i32):
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v11 = iadd v0, v10
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return v11
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}
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