127 lines
3.7 KiB
LLVM
127 lines
3.7 KiB
LLVM
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; Test the allocation of frames in cases where we do not need to save
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; registers in the prologue.
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;
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; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
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declare void @foo(i32 *)
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; The CFA offset is 160 (the caller-allocated part of the frame) + 168.
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define void @f1(i64 %x) {
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; CHECK-LABEL: f1:
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; CHECK: aghi %r15, -168
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; CHECK: .cfi_def_cfa_offset 328
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; CHECK: stg %r2, 160(%r15)
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; CHECK: aghi %r15, 168
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; CHECK: br %r14
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%y = alloca i64, align 8
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store volatile i64 %x, i64* %y
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ret void
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}
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; Check frames of size 32760, which is the largest size that can be both
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; allocated and freed using AGHI. This size is big enough to require
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; two emergency spill slots at 160(%r15), for instructions with unsigned
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; 12-bit offsets that end up being out of range. Fill the remaining
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; 32760 - 176 bytes by allocating (32760 - 176) / 8 = 4073 doublewords.
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define void @f2(i64 %x) {
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; CHECK-LABEL: f2:
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; CHECK: aghi %r15, -32760
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; CHECK: .cfi_def_cfa_offset 32920
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; CHECK: stg %r2, 176(%r15)
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; CHECK: aghi %r15, 32760
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; CHECK: br %r14
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%y = alloca [4073 x i64], align 8
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%ptr = getelementptr inbounds [4073 x i64], [4073 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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; Allocate one more doubleword. This is the one frame size that we can
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; allocate using AGHI but must free using AGFI.
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define void @f3(i64 %x) {
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; CHECK-LABEL: f3:
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; CHECK: aghi %r15, -32768
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; CHECK: .cfi_def_cfa_offset 32928
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; CHECK: stg %r2, 176(%r15)
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; CHECK: agfi %r15, 32768
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; CHECK: br %r14
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%y = alloca [4074 x i64], align 8
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%ptr = getelementptr inbounds [4074 x i64], [4074 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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; Allocate another doubleword on top of that. The allocation and free
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; must both use AGFI.
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define void @f4(i64 %x) {
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; CHECK-LABEL: f4:
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; CHECK: agfi %r15, -32776
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; CHECK: .cfi_def_cfa_offset 32936
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; CHECK: stg %r2, 176(%r15)
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; CHECK: agfi %r15, 32776
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; CHECK: br %r14
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%y = alloca [4075 x i64], align 8
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%ptr = getelementptr inbounds [4075 x i64], [4075 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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; The largest size that can be both allocated and freed using AGFI.
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; At this point the frame is too big to represent properly in the CFI.
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define void @f5(i64 %x) {
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; CHECK-LABEL: f5:
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; CHECK: agfi %r15, -2147483640
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; CHECK: stg %r2, 176(%r15)
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; CHECK: agfi %r15, 2147483640
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; CHECK: br %r14
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%y = alloca [268435433 x i64], align 8
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%ptr = getelementptr inbounds [268435433 x i64], [268435433 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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; The only frame size that can be allocated using a single AGFI but which
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; must be freed using two instructions.
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define void @f6(i64 %x) {
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; CHECK-LABEL: f6:
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; CHECK: agfi %r15, -2147483648
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; CHECK: stg %r2, 176(%r15)
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; CHECK: agfi %r15, 2147483640
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; CHECK: aghi %r15, 8
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; CHECK: br %r14
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%y = alloca [268435434 x i64], align 8
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%ptr = getelementptr inbounds [268435434 x i64], [268435434 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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; The smallest frame size that needs two instructions to both allocate
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; and free the frame.
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define void @f7(i64 %x) {
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; CHECK-LABEL: f7:
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; CHECK: agfi %r15, -2147483648
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; CHECK: aghi %r15, -8
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; CHECK: stg %r2, 176(%r15)
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; CHECK: agfi %r15, 2147483640
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; CHECK: aghi %r15, 16
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; CHECK: br %r14
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%y = alloca [268435435 x i64], align 8
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%ptr = getelementptr inbounds [268435435 x i64], [268435435 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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; Make sure that LA can be rematerialized.
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define void @f8() {
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; CHECK-LABEL: f8:
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; CHECK: la %r2, 164(%r15)
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; CHECK: brasl %r14, foo@PLT
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; CHECK: la %r2, 164(%r15)
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; CHECK: brasl %r14, foo@PLT
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; CHECK: br %r14
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%ptr = alloca i32
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call void @foo(i32 *%ptr)
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call void @foo(i32 *%ptr)
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ret void
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}
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