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47 lines
1.4 KiB
Rust
47 lines
1.4 KiB
Rust
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//@ revisions: enable-backchain disable-backchain
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//@ assembly-output: emit-asm
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//@ compile-flags: -O --crate-type=lib --target=s390x-unknown-linux-gnu
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//@ needs-llvm-components: systemz
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//@[enable-backchain] compile-flags: -Ctarget-feature=+backchain
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//@[disable-backchain] compile-flags: -Ctarget-feature=-backchain
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#![feature(no_core, lang_items)]
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#![no_std]
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#![no_core]
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#[lang = "sized"]
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trait Sized {}
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extern "C" {
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fn extern_func();
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}
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// CHECK-LABEL: test_backchain
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#[no_mangle]
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extern "C" fn test_backchain() -> i32 {
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// Here we try to match if backchain register is saved to the parameter area (stored in r15/sp)
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// And also if a new parameter area (160 bytes) is allocated for the upcoming function call
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// enable-backchain: lgr [[REG1:.*]], %r15
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// enable-backchain-NEXT: aghi %r15, -160
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// enable-backchain: stg [[REG1]], 0(%r15)
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// disable-backchain: aghi %r15, -160
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// disable-backchain-NOT: stg %r{{.*}}, 0(%r15)
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unsafe {
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extern_func();
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}
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// enable-backchain-NEXT: brasl %r{{.*}}, extern_func@PLT
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// disable-backchain: brasl %r{{.*}}, extern_func@PLT
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// Make sure that the expected return value is written into %r2 (return register):
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// enable-backchain-NEXT: lghi %r2, 1
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// disable-backchain: lghi %r2, 0
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#[cfg(target_feature = "backchain")]
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{
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1
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}
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#[cfg(not(target_feature = "backchain"))]
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{
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0
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}
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// CHECK: br %r{{.*}}
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}
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