a1710eb3cd
The LIT test cases were migrated with the script provided by Nikita Popov. No manual changes were made. Committed without review since no functional changes, after consultation with uweigand.
121 lines
3.2 KiB
LLVM
121 lines
3.2 KiB
LLVM
; 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(ptr)
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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, ptr %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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store volatile i64 %x, ptr %y
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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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store volatile i64 %x, ptr %y
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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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store volatile i64 %x, ptr %y
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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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store volatile i64 %x, ptr %y
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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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store volatile i64 %x, ptr %y
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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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store volatile i64 %x, ptr %y
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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(ptr %ptr)
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call void @foo(ptr %ptr)
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ret void
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}
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