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21 lines
570 B
Rust
21 lines
570 B
Rust
//@ compile-flags: -O
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#![crate_type = "lib"]
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// Ensure that when val < base, we do not divide or multiply.
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// CHECK-LABEL: @checked_ilog
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// CHECK-SAME: (i16{{.*}} %val, i16{{.*}} %base)
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#[no_mangle]
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pub fn checked_ilog(val: u16, base: u16) -> Option<u32> {
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// CHECK-NOT: udiv
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// CHECK-NOT: mul
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// CHECK: %[[IS_LESS:.+]] = icmp ult i16 %val, %base
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// CHECK-NEXT: br i1 %[[IS_LESS]], label %[[TRUE:.+]], label %[[FALSE:.+]]
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// CHECK: [[TRUE]]:
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// CHECK-NOT: udiv
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// CHECK-NOT: mul
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// CHECK: ret { i32, i32 }
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val.checked_ilog(base)
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}
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