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5c1733e4f4
An inline asm terminator defines outputs along its target edges -- a fallthrough target and labeled targets. Code generation implements this by inserting code directly into the target blocks. This approach works only if the target blocks don't have other predecessors. Establish required invariant by extending existing code that breaks critical edges before code generation.
38 lines
1.1 KiB
Rust
38 lines
1.1 KiB
Rust
//@ 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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