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85 lines
2.2 KiB
85 lines
2.2 KiB
4 months ago
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; Test the backchain attribute.
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;
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; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck -allow-deprecated-dag-overlap %s
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declare i8 *@llvm.stacksave()
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declare void @llvm.stackrestore(i8 *)
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declare void @g()
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; nothing should happen if no stack frame is needed.
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define void @f1() "backchain" {
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; CHECK-LABEL: f1:
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; CHECK-NOT: stg
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ret void
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}
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; check that backchain is saved if we call someone
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define void @f2() "backchain" {
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; CHECK-LABEL: f2:
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; CHECK: stmg %r14, %r15, 112(%r15)
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; CHECK: lgr %r1, %r15
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; CHECK: aghi %r15, -160
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; CHECK: stg %r1, 0(%r15)
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call void @g()
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call void @g()
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ret void
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}
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; check that backchain is saved if we have an alloca
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define void @f3() "backchain" {
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; CHECK-LABEL: f3:
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; CHECK-NOT: stmg
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; CHECK: lgr %r1, %r15
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; CHECK: aghi %r15, -168
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; CHECK: stg %r1, 0(%r15)
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%ign = alloca i8, i32 4
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ret void
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}
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; check that alloca copies the backchain
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define void @f4(i32 %len) "backchain" {
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; CHECK-LABEL: f4:
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; CHECK: stmg %r11, %r15, 88(%r15)
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; CHECK: lgr %r1, %r15
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; CHECK: aghi %r15, -160
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; CHECK: stg %r1, 0(%r15)
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; CHECK: lgr %r11, %r15
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; CHECK-DAG: lg [[BC:%r[0-9]+]], 0(%r15)
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; CHECK-DAG: lgr [[NEWSP:%r[0-9]+]], %r15
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; CHECK: lgr %r15, [[NEWSP]]
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; CHECK: stg [[BC]], 0([[NEWSP]])
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%ign = alloca i8, i32 %len
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ret void
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}
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; check that llvm.stackrestore restores the backchain
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define void @f5(i32 %count1, i32 %count2) "backchain" {
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; CHECK-LABEL: f5:
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; CHECK: stmg %r11, %r15, 88(%r15)
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; CHECK: lgr %r1, %r15
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; CHECK: aghi %r15, -160
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; CHECK: stg %r1, 0(%r15)
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; CHECK: lgr %r11, %r15
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; CHECK-DAG: lgr [[SAVESP:%r[0-9]+]], %r15
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; CHECK-DAG: lg [[BC:%r[0-9]+]], 0(%r15)
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; CHECK-DAG: lgr [[NEWSP:%r[0-9]+]], %r15
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; CHECK-DAG: lgr %r15, [[NEWSP]]
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; CHECK-DAG: stg [[BC]], 0([[NEWSP]])
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; CHECK-DAG: lg [[BC2:%r[0-9]+]], 0(%r15)
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; CHECK-DAG: lgr %r15, [[SAVESP]]
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; CHECK-DAG: stg [[BC2]], 0([[SAVESP]])
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; CHECK-DAG: lg [[BC3:%r[0-9]+]], 0(%r15)
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; CHECK-DAG: lgr [[NEWSP2:%r[0-9]+]], %r15
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; CHECK-DAG: lgr %r15, [[NEWSP2]]
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; CHECK-DAG: stg [[BC3]], 0([[NEWSP2]])
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; CHECK: lmg %r11, %r15, 248(%r11)
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; CHECK: br %r14
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%src = call i8 *@llvm.stacksave()
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%array1 = alloca i8, i32 %count1
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store volatile i8 0, i8 *%array1
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call void @llvm.stackrestore(i8 *%src)
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%array2 = alloca i8, i32 %count2
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store volatile i8 0, i8 *%array2
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ret void
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}
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