42 lines
989 B
Rust
42 lines
989 B
Rust
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//@ compile-flags: -Cno-prepopulate-passes -Copt-level=0
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#![crate_type = "lib"]
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#[no_mangle]
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pub fn demo_for_i32() {
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generic_impl::<i32>();
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}
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// Two important things here:
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// - We replace the "then" block with `unreachable` to avoid linking problems
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// - We neither declare nor define the `big_impl` that said block "calls".
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// CHECK-LABEL: ; skip_mono_inside_if_false::generic_impl
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// CHECK: start:
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// CHECK-NEXT: br label %[[ELSE_BRANCH:bb[0-9]+]]
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// CHECK: [[ELSE_BRANCH]]:
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// CHECK-NEXT: call skip_mono_inside_if_false::small_impl
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// CHECK: bb{{[0-9]+}}:
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// CHECK-NEXT: ret void
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// CHECK: bb{{[0-9+]}}:
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// CHECK-NEXT: unreachable
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fn generic_impl<T>() {
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trait MagicTrait {
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const IS_BIG: bool;
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}
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impl<T> MagicTrait for T {
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const IS_BIG: bool = std::mem::size_of::<T>() > 10;
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}
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if T::IS_BIG {
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big_impl::<T>();
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} else {
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small_impl::<T>();
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}
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}
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#[inline(never)]
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fn small_impl<T>() {}
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#[inline(never)]
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fn big_impl<T>() {}
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