2f000a78bf
This should have no real effect in most cases, as e.g. `hidden`
visibility already implies `dso_local` (or at least LLVM IR does not
preserve the `dso_local` setting if the item is already `hidden`), but
it should fix `-Crelocation-model=static` and improve codegen in
executables.
Note that this PR does not exhaustively port the logic in [clang]. Only
the obviously correct portion and what is necessary to fix a regression
from LLVM 12 that relates to `-Crelocation_model=static`.
Fixes #83335
[clang]: 3001d080c8/clang/lib/CodeGen/CodeGenModule.cpp (L945-L1039)
50 lines
1.3 KiB
Rust
50 lines
1.3 KiB
Rust
// revisions: NO-OPT SIZE-OPT SPEED-OPT
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//[NO-OPT] compile-flags: -Copt-level=0 -Ccodegen-units=1
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//[SIZE-OPT] compile-flags: -Copt-level=s -Ccodegen-units=1
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//[SPEED-OPT] compile-flags: -Copt-level=3 -Ccodegen-units=1
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#![feature(optimize_attribute)]
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#![crate_type="rlib"]
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// CHECK-LABEL: define{{.*}}i32 @nothing
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// CHECK-SAME: [[NOTHING_ATTRS:#[0-9]+]]
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// NO-OPT: ret i32 4
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// SIZE-OPT: ret i32 4
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// SPEEC-OPT: ret i32 4
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#[no_mangle]
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pub fn nothing() -> i32 {
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2 + 2
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}
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// CHECK-LABEL: define{{.*}}i32 @size
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// CHECK-SAME: [[SIZE_ATTRS:#[0-9]+]]
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// NO-OPT: ret i32 6
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// SIZE-OPT: ret i32 6
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// SPEED-OPT: ret i32 6
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#[optimize(size)]
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#[no_mangle]
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pub fn size() -> i32 {
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3 + 3
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}
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// CHECK-LABEL: define{{.*}}i32 @speed
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// NO-OPT-SAME: [[NOTHING_ATTRS]]
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// SPEED-OPT-SAME: [[NOTHING_ATTRS]]
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// SIZE-OPT-SAME: [[SPEED_ATTRS:#[0-9]+]]
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// NO-OPT: ret i32 8
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// SIZE-OPT: ret i32 8
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// SPEED-OPT: ret i32 8
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#[optimize(speed)]
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#[no_mangle]
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pub fn speed() -> i32 {
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4 + 4
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}
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// NO-OPT-DAG: attributes [[SIZE_ATTRS]] = {{.*}}minsize{{.*}}optsize{{.*}}
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// SPEED-OPT-DAG: attributes [[SIZE_ATTRS]] = {{.*}}minsize{{.*}}optsize{{.*}}
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// SIZE-OPT-DAG: attributes [[NOTHING_ATTRS]] = {{.*}}optsize{{.*}}
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// SIZE-OPT-DAG: attributes [[SIZE_ATTRS]] = {{.*}}minsize{{.*}}optsize{{.*}}
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// SIZE-OPT: attributes [[SPEED_ATTRS]]
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// SIZE-OPT-NOT: minsize
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// SIZE-OPT-NOT: optsize
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