44 lines
936 B
Rust
44 lines
936 B
Rust
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// Ensure inout asm! operands are marked as used by the liveness pass
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// check-pass
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#![feature(asm)]
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#![allow(dead_code)]
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#![warn(unused_assignments)]
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#![warn(unused_variables)]
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// Test the single inout case
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unsafe fn f1(mut src: *const u8) {
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asm!("/*{0}*/", inout(reg) src); //~ WARN value assigned to `src` is never read
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}
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unsafe fn f2(mut src: *const u8) -> *const u8 {
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asm!("/*{0}*/", inout(reg) src);
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src
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}
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// Test the split inout case
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unsafe fn f3(mut src: *const u8) {
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asm!("/*{0}*/", inout(reg) src => src); //~ WARN value assigned to `src` is never read
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}
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unsafe fn f4(mut src: *const u8) -> *const u8 {
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asm!("/*{0}*/", inout(reg) src => src);
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src
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}
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// Tests the use of field projections
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struct S {
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field: *mut u8,
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}
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unsafe fn f5(src: &mut S) {
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asm!("/*{0}*/", inout(reg) src.field);
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}
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unsafe fn f6(src: &mut S) {
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asm!("/*{0}*/", inout(reg) src.field => src.field);
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}
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fn main() {}
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