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81 lines
1.5 KiB
Rust
81 lines
1.5 KiB
Rust
//@ compile-flags: -Copt-level=3
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#![crate_type = "lib"]
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#![feature(likely_unlikely)]
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use std::hint::unlikely;
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#[inline(never)]
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#[no_mangle]
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pub fn path_a() {
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println!("path a");
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}
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#[inline(never)]
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#[no_mangle]
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pub fn path_b() {
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println!("path b");
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}
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#[no_mangle]
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pub fn test1(x: bool) {
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if unlikely(x) {
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path_a();
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} else {
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path_b();
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}
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// CHECK-LABEL: @test1(
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// CHECK: br i1 %x, label %bb2, label %bb4, !prof ![[NUM:[0-9]+]]
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// CHECK: bb4:
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// CHECK: path_b
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// CHECK: bb2:
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// CHECK: path_a
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}
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#[no_mangle]
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pub fn test2(x: i32) {
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match unlikely(x > 0) {
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true => path_a(),
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false => path_b(),
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}
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// CHECK-LABEL: @test2(
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// CHECK: br i1 %_2, label %bb2, label %bb4, !prof ![[NUM]]
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// CHECK: bb4:
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// CHECK: path_b
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// CHECK: bb2:
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// CHECK: path_a
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}
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#[no_mangle]
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pub fn test3(x: i8) {
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match unlikely(x < 7) {
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true => path_a(),
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_ => path_b(),
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}
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// CHECK-LABEL: @test3(
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// CHECK: br i1 %_2, label %bb2, label %bb4, !prof ![[NUM]]
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// CHECK: bb4:
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// CHECK: path_b
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// CHECK: bb2:
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// CHECK: path_a
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}
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#[no_mangle]
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pub fn test4(x: u64) {
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match unlikely(x != 33) {
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false => path_a(),
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_ => path_b(),
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}
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// CHECK-LABEL: @test4(
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// CHECK: br i1 %0, label %bb4, label %bb2, !prof ![[NUM2:[0-9]+]]
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// CHECK: bb4:
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// CHECK: path_a
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// CHECK: bb2:
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// CHECK: path_b
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}
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// CHECK: ![[NUM]] = !{!"branch_weights", {{(!"expected", )?}}i32 1, i32 2000}
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