derek.holloway
7502bf64a4
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64 lines
2.0 KiB
LLVM
64 lines
2.0 KiB
LLVM
; RUN: llc -verify-machineinstrs -mtriple=x86_64-unknown-unknown -o - %s | FileCheck --check-prefix=CHECK --check-prefix=OPT %s
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; RUN: llc -O0 -verify-machineinstrs -mtriple=x86_64-unknown-unknown -o - %s | FileCheck %s
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; Parameter with swiftself should be allocated to r13.
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; CHECK-LABEL: swiftself_param:
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; CHECK: movq %r13, %rax
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define ptr@swiftself_param(ptr swiftself %addr0) {
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ret ptr%addr0
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}
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; Check that r13 is used to pass a swiftself argument.
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; CHECK-LABEL: call_swiftself:
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; CHECK: movq %rdi, %r13
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; CHECK: callq {{_?}}swiftself_param
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define ptr@call_swiftself(ptr %arg) {
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%res = call ptr@swiftself_param(ptr swiftself %arg)
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ret ptr%res
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}
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; r13 should be saved by the callee even if used for swiftself
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; CHECK-LABEL: swiftself_clobber:
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; CHECK: pushq %r13
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; ...
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; CHECK: popq %r13
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define ptr@swiftself_clobber(ptr swiftself %addr0) {
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call void asm sideeffect "nop", "~{r13}"()
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ret ptr%addr0
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}
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; Demonstrate that we do not need any movs when calling multiple functions
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; with swiftself argument.
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; CHECK-LABEL: swiftself_passthrough:
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; OPT-NOT: mov{{.*}}r13
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; OPT: callq {{_?}}swiftself_param
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; OPT-NOT: mov{{.*}}r13
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; OPT-NEXT: callq {{_?}}swiftself_param
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define void @swiftself_passthrough(ptr swiftself %addr0) {
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call ptr@swiftself_param(ptr swiftself %addr0)
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call ptr@swiftself_param(ptr swiftself %addr0)
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ret void
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}
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; We can use a tail call if the callee swiftself is the same as the caller one.
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; This should also work with fast-isel.
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; CHECK-LABEL: swiftself_tail:
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; CHECK: jmp {{_?}}swiftself_param
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; CHECK-NOT: ret
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define ptr @swiftself_tail(ptr swiftself %addr0) {
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call void asm sideeffect "", "~{r13}"()
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%res = tail call ptr @swiftself_param(ptr swiftself %addr0)
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ret ptr %res
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}
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; We can not use a tail call if the callee swiftself is not the same as the
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; caller one.
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; CHECK-LABEL: swiftself_notail:
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; CHECK: movq %rdi, %r13
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; CHECK: callq {{_?}}swiftself_param
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; CHECK: retq
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define ptr @swiftself_notail(ptr swiftself %addr0, ptr %addr1) nounwind {
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%res = tail call ptr @swiftself_param(ptr swiftself %addr1)
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ret ptr %res
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}
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