77 lines
2.5 KiB
LLVM
77 lines
2.5 KiB
LLVM
; Test the allocation of emergency spill slots.
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;
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; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
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; For frames of size less than 4096 - 2*160, no emercengy spill slot
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; is required. Check the maximum such case.
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define void @f1(i64 %x) {
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; CHECK-LABEL: f1:
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; CHECK: stg %r2, 160(%r15)
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; CHECK: br %r14
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%y = alloca [471 x i64], align 8
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%ptr = getelementptr inbounds [471 x i64], [471 x i64]* %y, i64 0, i64 0
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store volatile i64 %x, i64* %ptr
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ret void
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}
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; If the frame size is at least 4096 - 2*160, we do need the emergency
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; spill slots. Check the minimum such case.
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define void @f2(i64 %x) {
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; CHECK-LABEL: f2:
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; CHECK: stg %r2, 176(%r15)
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; CHECK: br %r14
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%y = alloca [472 x i64], align 8
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%ptr = getelementptr inbounds [472 x i64], [472 x i64]* %y, i64 0, i64 0
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store volatile i64 %x, i64* %ptr
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ret void
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}
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; However, if there are incoming stack arguments, those also need to be
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; in reach, so the maximum frame size without emergency spill slots is
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; 4096 - 2*160 - <size of incoming stack arguments>. Check the maximum
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; case where we still need no emergency spill slots ...
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define void @f3(i64 %x, i64 %r3, i64 %r4, i64 %r5, i64 %r6, i64 %stack) {
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; CHECK-LABEL: f3:
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; CHECK: stg %r2, 160(%r15)
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; CHECK: br %r14
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%y = alloca [470 x i64], align 8
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%ptr = getelementptr inbounds [470 x i64], [470 x i64]* %y, i64 0, i64 0
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store volatile i64 %x, i64* %ptr
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ret void
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}
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; ... and the minimum case where we do.
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define void @f4(i64 %x, i64 %r3, i64 %r4, i64 %r5, i64 %r6, i64 %stack) {
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; CHECK-LABEL: f4:
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; CHECK: stg %r2, 176(%r15)
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; CHECK: br %r14
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%y = alloca [471 x i64], align 8
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%ptr = getelementptr inbounds [471 x i64], [471 x i64]* %y, i64 0, i64 0
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store volatile i64 %x, i64* %ptr
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ret void
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}
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; Try again for the case of two stack arguments.
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; Check the maximum case where we still need no emergency spill slots ...
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define void @f5(i64 %x, i64 %r3, i64 %r4, i64 %r5, i64 %r6, i64 %stack1, i64 %stack2) {
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; CHECK-LABEL: f5:
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; CHECK: stg %r2, 160(%r15)
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; CHECK: br %r14
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%y = alloca [469 x i64], align 8
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%ptr = getelementptr inbounds [469 x i64], [469 x i64]* %y, i64 0, i64 0
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store volatile i64 %x, i64* %ptr
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ret void
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}
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; ... and the minimum case where we do.
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define void @f6(i64 %x, i64 %r3, i64 %r4, i64 %r5, i64 %r6, i64 %stack1, i64 %stack2) {
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; CHECK-LABEL: f6:
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; CHECK: stg %r2, 176(%r15)
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; CHECK: br %r14
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%y = alloca [470 x i64], align 8
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%ptr = getelementptr inbounds [470 x i64], [470 x i64]* %y, i64 0, i64 0
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store volatile i64 %x, i64* %ptr
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ret void
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}
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