36 lines
815 B
Rust
36 lines
815 B
Rust
//@ compile-flags: -O -Z merge-functions=disabled
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#![crate_type = "lib"]
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// This tests that LLVM can optimize based on the niches in the source or
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// destination types for casts.
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// CHECK-LABEL: @u32_index
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#[no_mangle]
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pub fn u32_index(c: u32) -> [bool; 22] {
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let mut array = [false; 22];
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let index = 32 - c.leading_zeros();
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// CHECK: call core::panicking::panic
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array[index as usize] = true;
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array
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}
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// CHECK-LABEL: @char_as_u32_index
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#[no_mangle]
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pub fn char_as_u32_index(c: char) -> [bool; 22] {
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// CHECK: %[[B:.+]] = icmp ult i32 %c, 1114112
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// CHECK: call void @llvm.assume(i1 %[[B]])
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let c = c as u32;
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let mut array = [false; 22];
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let index = 32 - c.leading_zeros();
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// CHECK-NOT: call core::panicking::panic
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array[index as usize] = true;
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array
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}
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