derek.holloway
7502bf64a4
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67 lines
2.0 KiB
LLVM
67 lines
2.0 KiB
LLVM
; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
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; Parameter with swiftself should be allocated to r10.
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; CHECK-LABEL: swiftself_param:
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; CHECK: lgr %r2, %r10
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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 r10 is used to pass a swiftself argument.
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; CHECK-LABEL: call_swiftself:
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; CHECK: lgr %r10, %r2
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; CHECK: brasl %r14, 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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; r10 should be saved by the callee even if used for swiftself
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; CHECK-LABEL: swiftself_clobber:
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; CHECK: stmg %r10,
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; ...
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; CHECK: lmg %r10,
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; CHECK: br %r14
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define ptr@swiftself_clobber(ptr swiftself %addr0) {
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call void asm sideeffect "", "~{r10}"()
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ret ptr %addr0
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}
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; Demonstrate that we do not need any loads when calling multiple functions
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; with swiftself argument.
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; CHECK-LABEL: swiftself_passthrough:
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; CHECK-NOT: lg{{.*}}r10,
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; CHECK: brasl %r14, swiftself_param
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; CHECK-NOT: lg{{.*}}r10,
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; CHECK-NEXT: brasl %r14, 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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; Normally, we can use a tail call if the callee swiftself is the same as the
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; caller one. Not yet supported on SystemZ.
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; CHECK-LABEL: swiftself_tail:
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; CHECK: lgr %r[[REG1:[0-9]+]], %r10
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; CHECK: lgr %r10, %r[[REG1]]
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; CHECK: brasl %r14, swiftself_param
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; CHECK: br %r14
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define ptr @swiftself_tail(ptr swiftself %addr0) {
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call void asm sideeffect "", "~{r10}"()
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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: lgr %r10, %r2
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; CHECK: brasl %r14, swiftself_param
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; CHECK: lmg %r10,
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; CHECK: br %r14
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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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