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2567ab558c
Summary: Port rL265480, rL264754, rL265997 and rL266252 to SystemZ, in order to enable the Swift port on the architecture. SwiftSelf and SwiftError are assigned to R10 and R9, respectively, which are normally callee-saved registers. For more information, see: RFC: Implementing the Swift calling convention in LLVM and Clang https://groups.google.com/forum/#!topic/llvm-dev/epDd2w93kZ0 Reviewers: kbarton, manmanren, rjmccall, uweigand Subscribers: llvm-commits Differential Revision: http://reviews.llvm.org/D19414 llvm-svn: 267823
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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