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38 lines
1.1 KiB
Rust
38 lines
1.1 KiB
Rust
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//@ only-x86_64
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//@ compile-flags: -C no-prepopulate-passes
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#![feature(asm_goto)]
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#![feature(asm_goto_with_outputs)]
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#![crate_type = "lib"]
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use std::arch::asm;
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// Regression test for #137867. Check that critical edges have been split before code generation,
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// and so all stores to the asm output occur on disjoint paths without any of them jumping to
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// another callbr label.
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//
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// CHECK-LABEL: @f(
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// CHECK: [[OUT:%.*]] = callbr i32 asm
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// CHECK-NEXT: to label %[[BB0:.*]] [label %[[BB1:.*]], label %[[BB2:.*]]],
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// CHECK: [[BB1]]:
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// CHECK-NEXT: store i32 [[OUT]], ptr %a
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// CHECK-NEXT: br label %[[BBR:.*]]
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// CHECK: [[BB2]]:
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// CHECK-NEXT: store i32 [[OUT]], ptr %a
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// CHECK-NEXT: br label %[[BBR]]
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// CHECK: [[BB0]]:
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// CHECK-NEXT: store i32 [[OUT]], ptr %a
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// CHECK-NEXT: br label %[[BBR]]
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// CHECK: [[BBR]]:
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// CHECK-NEXT: [[RET:%.*]] = load i32, ptr %a
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// CHECK-NEXT: ret i32 [[RET]]
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#[unsafe(no_mangle)]
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pub unsafe fn f(mut a: u32) -> u32 {
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asm!(
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"jmp {}
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jmp {}",
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label {},
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label {},
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inout("eax") a,
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);
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a
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}
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