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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
53 lines
1.7 KiB
LLVM
53 lines
1.7 KiB
LLVM
; Make sure that the alloca offset isn't lost when the alloca result is
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; used directly in a load or store. There must always be an LA or LAY.
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;
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; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s -check-prefix=CHECK-A
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; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s -check-prefix=CHECK-B
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; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s -check-prefix=CHECK-C
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; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s -check-prefix=CHECK-D
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declare i64 @bar(i8 *%a)
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define i64 @f1(i64 %length, i64 %index) {
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; CHECK-A-LABEL: f1:
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; CHECK-A: lgr %r15, [[ADDR:%r[1-5]]]
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; CHECK-A: la %r2, 160([[ADDR]])
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; CHECK-A: mvi 0(%r2), 0
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;
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; CHECK-B-LABEL: f1:
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; CHECK-B: lgr %r15, [[ADDR:%r[1-5]]]
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; CHECK-B: la %r2, 160([[ADDR]])
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; CHECK-B: mvi 4095(%r2), 1
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;
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; CHECK-C-LABEL: f1:
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; CHECK-C: lgr %r15, [[ADDR:%r[1-5]]]
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; CHECK-C-DAG: la %r2, 160([[ADDR]])
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; CHECK-C-DAG: lhi [[TMP:%r[0-5]]], 2
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; CHECK-C: stc [[TMP]], 0({{%r3,%r2|%r2,%r3}})
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;
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; CHECK-D-LABEL: f1:
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; CHECK-D: lgr %r15, [[ADDR:%r[1-5]]]
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; CHECK-D-DAG: la %r2, 160([[ADDR]])
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; CHECK-D-DAG: lhi [[TMP:%r[0-5]]], 3
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; CHECK-D: stc [[TMP]], 4095({{%r3,%r2|%r2,%r3}})
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;
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; CHECK-E-LABEL: f1:
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; CHECK-E: lgr %r15, [[ADDR:%r[1-5]]]
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; CHECK-E-DAG: la %r2, 160([[ADDR]])
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; CHECK-E-DAG: lhi [[TMP:%r[0-5]]], 4
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; CHECK-E: stcy [[TMP]], 4096({{%r3,%r2|%r2,%r3}})
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%a = alloca i8, i64 %length
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store volatile i8 0, i8 *%a
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%b = getelementptr i8 *%a, i64 4095
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store volatile i8 1, i8 *%b
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%c = getelementptr i8 *%a, i64 %index
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store volatile i8 2, i8 *%c
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%d = getelementptr i8 *%c, i64 4095
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store volatile i8 3, i8 *%d
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%e = getelementptr i8 *%d, i64 1
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store volatile i8 4, i8 *%e
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%count = call i64 @bar(i8 *%a)
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%res = add i64 %count, 1
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ret i64 %res
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}
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