derek.holloway
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97 lines
2.3 KiB
LLVM
97 lines
2.3 KiB
LLVM
; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
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; Test lowering of @llvm.frameaddress with packed-stack.
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; With back chain
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attributes #0 = { nounwind "packed-stack" "backchain" "use-soft-float"="true" }
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define ptr @fp0() #0 {
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entry:
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; CHECK-LABEL: fp0:
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; CHECK: la %r2, 152(%r15)
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; CHECK-NEXT: br %r14
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%0 = tail call ptr @llvm.frameaddress(i32 0)
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ret ptr %0
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}
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define ptr @fp0f() #0 {
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entry:
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; CHECK-LABEL: fp0f:
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; CHECK: lgr %r1, %r15
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; CHECK-NEXT: aghi %r15, -16
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; CHECK-NEXT: stg %r1, 152(%r15)
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; CHECK-NEXT: la %r2, 168(%r15)
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; CHECK-NEXT: aghi %r15, 16
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; CHECK-NEXT: br %r14
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%0 = alloca i64, align 8
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%1 = tail call ptr @llvm.frameaddress(i32 0)
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ret ptr %1
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}
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; Check the caller's frame address.
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define ptr @fpcaller() #0 {
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entry:
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; CHECK-LABEL: fpcaller:
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; CHECK: lghi %r2, 152
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; CHECK: ag %r2, 152(%r15)
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; CHECK: br %r14
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%0 = tail call ptr @llvm.frameaddress(i32 1)
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ret ptr %0
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}
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; Check the caller's caller's frame address.
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define ptr @fpcallercaller() #0 {
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entry:
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; CHECK-LABEL: fpcallercaller:
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; CHECK: lg %r1, 152(%r15)
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; CHECK: lghi %r2, 152
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; CHECK: ag %r2, 152(%r1)
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; CHECK: br %r14
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%0 = tail call ptr @llvm.frameaddress(i32 2)
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ret ptr %0
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}
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; Without back chain
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attributes #1 = { nounwind "packed-stack" }
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define ptr @fp1() #1 {
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entry:
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; CHECK-LABEL: fp1:
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; CHECK: la %r2, 152(%r15)
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; CHECK-NEXT: br %r14
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%0 = tail call ptr @llvm.frameaddress(i32 0)
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ret ptr %0
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}
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; No saved registers: returning address of unused slot where backcahin would
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; have been located.
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define ptr @fp1f() #1 {
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entry:
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; CHECK-LABEL: fp1f:
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; CHECK: aghi %r15, -16
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; CHECK-NEXT: la %r2, 168(%r15)
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; CHECK-NEXT: aghi %r15, 16
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; CHECK-NEXT: br %r14
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%0 = alloca i64, align 8
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%1 = tail call ptr @llvm.frameaddress(i32 0)
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ret ptr %1
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}
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; Saved registers: returning address for first saved GPR.
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declare void @foo(ptr %Arg)
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define ptr @fp2() #1 {
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entry:
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; CHECK-LABEL: fp2:
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; CHECK: stmg %r14, %r15, 144(%r15)
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; CHECK-NEXT: aghi %r15, -16
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; CHECK-NEXT: la %r2, 168(%r15)
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; CHECK-NEXT: brasl %r14, foo@PLT
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; CHECK-NEXT: la %r2, 168(%r15)
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; CHECK-NEXT: lmg %r14, %r15, 160(%r15)
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; CHECK-NEXT: br %r14
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%0 = tail call ptr @llvm.frameaddress(i32 0)
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call void @foo(ptr %0);
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ret ptr %0
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}
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declare ptr @llvm.frameaddress(i32) nounwind readnone
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