forked from OSchip/llvm-project
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 i8 *@swiftself_param(i8* swiftself %addr0) {
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ret i8 *%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 i8 *@call_swiftself(i8* %arg) {
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%res = call i8 *@swiftself_param(i8* swiftself %arg)
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ret i8 *%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 i8 *@swiftself_clobber(i8* swiftself %addr0) {
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call void asm sideeffect "", "~{r10}"()
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ret i8 *%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(i8* swiftself %addr0) {
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call i8 *@swiftself_param(i8* swiftself %addr0)
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call i8 *@swiftself_param(i8* 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 i8* @swiftself_tail(i8* swiftself %addr0) {
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call void asm sideeffect "", "~{r10}"()
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%res = tail call i8* @swiftself_param(i8* swiftself %addr0)
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ret i8* %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 i8* @swiftself_notail(i8* swiftself %addr0, i8* %addr1) nounwind {
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%res = tail call i8* @swiftself_param(i8* swiftself %addr1)
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ret i8* %res
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}
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