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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
167 lines
3.6 KiB
LLVM
167 lines
3.6 KiB
LLVM
; Test moves of integers to 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 the low end of the unsigned range.
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define void @f1(i8 *%ptr) {
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; CHECK-LABEL: f1:
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; CHECK: mvi 0(%r2), 0
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; CHECK: br %r14
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store i8 0, i8 *%ptr
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ret void
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}
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; Check the high end of the signed range.
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define void @f2(i8 *%ptr) {
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; CHECK-LABEL: f2:
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; CHECK: mvi 0(%r2), 127
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; CHECK: br %r14
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store i8 127, i8 *%ptr
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ret void
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}
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; Check the next value up.
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define void @f3(i8 *%ptr) {
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; CHECK-LABEL: f3:
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; CHECK: mvi 0(%r2), 128
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; CHECK: br %r14
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store i8 -128, i8 *%ptr
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ret void
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}
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; Check the high end of the unsigned range.
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define void @f4(i8 *%ptr) {
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; CHECK-LABEL: f4:
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; CHECK: mvi 0(%r2), 255
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; CHECK: br %r14
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store i8 255, i8 *%ptr
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ret void
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}
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; Check -1.
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define void @f5(i8 *%ptr) {
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; CHECK-LABEL: f5:
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; CHECK: mvi 0(%r2), 255
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; CHECK: br %r14
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store i8 -1, i8 *%ptr
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ret void
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}
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; Check the low end of the signed range.
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define void @f6(i8 *%ptr) {
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; CHECK-LABEL: f6:
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; CHECK: mvi 0(%r2), 128
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; CHECK: br %r14
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store i8 -128, i8 *%ptr
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ret void
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}
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; Check the next value down.
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define void @f7(i8 *%ptr) {
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; CHECK-LABEL: f7:
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; CHECK: mvi 0(%r2), 127
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; CHECK: br %r14
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store i8 -129, i8 *%ptr
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ret void
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}
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; Check the high end of the MVI range.
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define void @f8(i8 *%src) {
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; CHECK-LABEL: f8:
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; CHECK: mvi 4095(%r2), 42
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; CHECK: br %r14
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%ptr = getelementptr i8 *%src, i64 4095
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store i8 42, i8 *%ptr
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ret void
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}
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; Check the next byte up, which should use MVIY instead of MVI.
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define void @f9(i8 *%src) {
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; CHECK-LABEL: f9:
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; CHECK: mviy 4096(%r2), 42
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; CHECK: br %r14
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%ptr = getelementptr i8 *%src, i64 4096
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store i8 42, i8 *%ptr
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ret void
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}
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; Check the high end of the MVIY range.
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define void @f10(i8 *%src) {
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; CHECK-LABEL: f10:
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; CHECK: mviy 524287(%r2), 42
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; CHECK: br %r14
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%ptr = getelementptr i8 *%src, i64 524287
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store i8 42, i8 *%ptr
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ret void
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}
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; Check the next byte up, which needs separate address logic.
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; Other sequences besides this one would be OK.
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define void @f11(i8 *%src) {
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; CHECK-LABEL: f11:
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; CHECK: agfi %r2, 524288
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; CHECK: mvi 0(%r2), 42
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; CHECK: br %r14
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%ptr = getelementptr i8 *%src, i64 524288
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store i8 42, i8 *%ptr
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ret void
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}
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; Check the high end of the negative MVIY range.
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define void @f12(i8 *%src) {
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; CHECK-LABEL: f12:
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; CHECK: mviy -1(%r2), 42
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; CHECK: br %r14
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%ptr = getelementptr i8 *%src, i64 -1
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store i8 42, i8 *%ptr
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ret void
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}
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; Check the low end of the MVIY range.
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define void @f13(i8 *%src) {
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; CHECK-LABEL: f13:
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; CHECK: mviy -524288(%r2), 42
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; CHECK: br %r14
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%ptr = getelementptr i8 *%src, i64 -524288
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store i8 42, i8 *%ptr
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ret void
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}
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; Check the next byte down, which needs separate address logic.
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; Other sequences besides this one would be OK.
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define void @f14(i8 *%src) {
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; CHECK-LABEL: f14:
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; CHECK: agfi %r2, -524289
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; CHECK: mvi 0(%r2), 42
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; CHECK: br %r14
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%ptr = getelementptr i8 *%src, i64 -524289
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store i8 42, i8 *%ptr
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ret void
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}
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; Check that MVI does not allow an index. We prefer STC in that case.
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define void @f15(i64 %src, i64 %index) {
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; CHECK-LABEL: f15:
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; CHECK: lhi [[TMP:%r[0-5]]], 42
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; CHECK: stc [[TMP]], 4095({{%r2,%r3|%r3,%r2}}
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; CHECK: br %r14
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%add1 = add i64 %src, %index
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%add2 = add i64 %add1, 4095
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%ptr = inttoptr i64 %add2 to i8 *
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store i8 42, i8 *%ptr
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ret void
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}
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; Check that MVIY does not allow an index. We prefer STCY in that case.
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define void @f16(i64 %src, i64 %index) {
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; CHECK-LABEL: f16:
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; CHECK: lhi [[TMP:%r[0-5]]], 42
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; CHECK: stcy [[TMP]], 4096({{%r2,%r3|%r3,%r2}}
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; CHECK: br %r14
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%add1 = add i64 %src, %index
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%add2 = add i64 %add1, 4096
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%ptr = inttoptr i64 %add2 to i8 *
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store i8 42, i8 *%ptr
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ret void
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}
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