25 lines
688 B
Rust
25 lines
688 B
Rust
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//@ compile-flags: -Copt-level=s
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//@ min-llvm-version: 19
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//@ only-x86_64
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// Test for #126585.
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// Ensure that this IR doesn't have extra undef phi input, which also guarantees that this asm
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// doesn't have subsequent labels and unnecessary `jmp` instructions.
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#![crate_type = "lib"]
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#[no_mangle]
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fn checked_div_round(a: u64, b: u64) -> Option<u64> {
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// CHECK-LABEL: @checked_div_round
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// CHECK: phi
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// CHECK-NOT: undef
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// CHECK: phi
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// CHECK-NOT: undef
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match b {
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0 => None,
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1 => Some(a),
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// `a / b` is computable and `(a % b) * 2` can not overflow since `b >= 2`.
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b => Some(a / b + if (a % b) * 2 >= b { 1 } else { 0 }),
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}
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}
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