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https://github.com/c64scene-ar/llvm-6502.git
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65ddcfa8c1
If we had a store of an integer to memory, and the integer and store size
were suitable for a form of MV..., we used MV... no matter what. We could
then have sequences like:
lay %r2, 0(%r3,%r4)
mvi 0(%r2), 4
In these cases it seems better to force the constant into a register
and use a normal store:
lhi %r2, 4
stc %r2, 0(%r3, %r4)
since %r2 is more likely to be hoisted and is easier to rematerialize.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@189098 91177308-0d34-0410-b5e6-96231b3b80d8
103 lines
2.1 KiB
LLVM
103 lines
2.1 KiB
LLVM
; Test moves of integers to 8-byte memory locations.
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;
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; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
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; Check moves of zero.
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define void @f1(i64 *%a) {
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; CHECK-LABEL: f1:
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; CHECK: mvghi 0(%r2), 0
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; CHECK: br %r14
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store i64 0, i64 *%a
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ret void
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}
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; Check the high end of the signed 16-bit range.
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define void @f2(i64 *%a) {
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; CHECK-LABEL: f2:
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; CHECK: mvghi 0(%r2), 32767
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; CHECK: br %r14
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store i64 32767, i64 *%a
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ret void
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}
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; Check the next value up, which can't use MVGHI.
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define void @f3(i64 *%a) {
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; CHECK-LABEL: f3:
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; CHECK-NOT: mvghi
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; CHECK: br %r14
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store i64 32768, i64 *%a
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ret void
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}
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; Check moves of -1.
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define void @f4(i64 *%a) {
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; CHECK-LABEL: f4:
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; CHECK: mvghi 0(%r2), -1
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; CHECK: br %r14
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store i64 -1, i64 *%a
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ret void
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}
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; Check the low end of the MVGHI range.
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define void @f5(i64 *%a) {
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; CHECK-LABEL: f5:
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; CHECK: mvghi 0(%r2), -32768
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; CHECK: br %r14
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store i64 -32768, i64 *%a
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ret void
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}
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; Check the next value down, which can't use MVGHI.
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define void @f6(i64 *%a) {
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; CHECK-LABEL: f6:
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; CHECK-NOT: mvghi
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; CHECK: br %r14
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store i64 -32769, i64 *%a
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ret void
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}
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; Check the high end of the MVGHI range.
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define void @f7(i64 *%a) {
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; CHECK-LABEL: f7:
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; CHECK: mvghi 4088(%r2), 42
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; CHECK: br %r14
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%ptr = getelementptr i64 *%a, i64 511
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store i64 42, i64 *%ptr
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ret void
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}
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; Check the next doubleword up, which is out of range. We prefer STG
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; in that case.
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define void @f8(i64 *%a) {
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; CHECK-LABEL: f8:
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; CHECK: lghi [[TMP:%r[0-5]]], 42
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; CHECK: stg [[TMP]], 4096(%r2)
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; CHECK: br %r14
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%ptr = getelementptr i64 *%a, i64 512
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store i64 42, i64 *%ptr
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ret void
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}
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; Check negative displacements, for which we again prefer STG.
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define void @f9(i64 *%a) {
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; CHECK-LABEL: f9:
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; CHECK: lghi [[TMP:%r[0-5]]], 42
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; CHECK: stg [[TMP]], -8(%r2)
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; CHECK: br %r14
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%ptr = getelementptr i64 *%a, i64 -1
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store i64 42, i64 *%ptr
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ret void
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}
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; Check that MVGHI does not allow an index.
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define void @f10(i64 %src, i64 %index) {
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; CHECK-LABEL: f10:
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; CHECK: lghi [[TMP:%r[0-5]]], 42
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; CHECK: stg [[TMP]], 0({{%r2,%r3|%r3,%r2}})
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; CHECK: br %r14
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%add = add i64 %src, %index
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%ptr = inttoptr i64 %add to i64 *
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store i64 42, i64 *%ptr
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ret void
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}
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