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e32b975e84
LLVM 22 is able to drop assumes that seem to not help further optimizations, which actually seems to dramatically _help_ further optimizations in some of our small test cases.
28 lines
570 B
Rust
28 lines
570 B
Rust
//@ compile-flags: -Copt-level=3
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//@ revisions: new old
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//@ [old] ignore-llvm-version: 22 - 99
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//@ [new] min-llvm-version: 22
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#![crate_type = "lib"]
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#[no_mangle]
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// CHECK-LABEL: @noop(
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pub fn noop(v: &mut Vec<u8>) {
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// CHECK-NOT: grow_one
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// CHECK-NOT: call
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// old: tail call void @llvm.assume
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// CHECK-NOT: grow_one
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// CHECK-NOT: call
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// CHECK: {{ret|[}]}}
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if let Some(x) = v.pop() {
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v.push(x)
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}
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}
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#[no_mangle]
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// CHECK-LABEL: @push_byte(
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pub fn push_byte(v: &mut Vec<u8>) {
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// CHECK: call {{.*}}grow_one
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v.push(3);
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}
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