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https://github.com/c64scene-ar/llvm-6502.git
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47734db936
This is another prerequisite for frame-to-frame MVC copies. I'll commit the patch that makes use of the slot separately. The downside of trying to test many corner cases with each of the available addressing modes is that a fair few tests need to account for the new frame layout. I do still think it's useful to have all these tests though, since it's something that wouldn't get much coverage otherwise. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185698 91177308-0d34-0410-b5e6-96231b3b80d8
127 lines
3.6 KiB
LLVM
127 lines
3.6 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(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: 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: 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]* %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: 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]* %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: 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]* %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: 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]* %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: 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]* %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: 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]* %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: 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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