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506ed4d4a5
On pre-v6 hardware, 'MOV lo, lo' gives undefined results, so such copies need to be avoided. This patch trades simplicity for implementation time at the expense of performance... As they say: correctness first, then performance. See http://lists.cs.uiuc.edu/pipermail/llvmdev/2014-August/075998.html for a few ideas on how to make this better. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216138 91177308-0d34-0410-b5e6-96231b3b80d8
39 lines
1.7 KiB
LLVM
39 lines
1.7 KiB
LLVM
; RUN: llc -mtriple=armv4-none--eabi < %s | FileCheck %s --check-prefix=CHECK-LOLOMOV
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; RUN: llc -mtriple=armv4t-none--eabi < %s | FileCheck %s --check-prefix=CHECK-LOLOMOV
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; RUN: llc -mtriple=armv5-none--eabi < %s | FileCheck %s --check-prefix=CHECK-LOLOMOV
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; RUN: llc -mtriple=armv6-none--eabi < %s | FileCheck %s --check-prefix=CHECK-LOLOMOV
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; RUN: llc -mtriple=armv7-none--eabi < %s | FileCheck %s --check-prefix=CHECK-LOLOMOV
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; RUN: llc -mtriple=thumbv6-none--eabi < %s | FileCheck %s --check-prefix=CHECK-LOLOMOV
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; RUN: llc -mtriple=thumbv7-none--eabi < %s | FileCheck %s --check-prefix=CHECK-LOLOMOV
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; CHECK-LOLOMOV-LABEL: foo
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; CHECK-LOLOMOV: mov [[TMP:r[0-7]]], [[SRC1:r[01]]]
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; CHECK-LOLOMOV-NEXT: mov [[SRC1]], [[SRC2:r[01]]]
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; CHECK-LOLOMOV-NEXT: mov [[SRC2]], [[TMP]]
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; CHECK-LOLOMOV-LABEL: bar
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; CHECK-LOLOMOV-LABEL: fnend
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;
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; 'MOV lo, lo' in Thumb mode produces undefined results on pre-v6 hardware
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; RUN: llc -mtriple=thumbv4t-none--eabi < %s | FileCheck %s --check-prefix=CHECK-NOLOLOMOV
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; RUN: llc -mtriple=thumbv5-none--eabi < %s | FileCheck %s --check-prefix=CHECK-NOLOLOMOV
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; CHECK-NOLOLOMOV-LABEL: foo
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; CHECK-NOLOLOMOV-NOT: mov [[TMP:r[0-7]]], [[SRC1:r[01]]]
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; CHECK-NOLOLOMOV: push {[[SRC1:r[01]]]}
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; CHECK-NOLOLOMOV-NEXT: pop {[[TMP:r[0-7]]]}
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; CHECK-NOLOLOMOV-NOT: mov [[TMP:r[0-7]]], [[SRC1:r[01]]]
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; CHECK-NOLOLOMOV: push {[[SRC2:r[01]]]}
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; CHECK-NOLOLOMOV-NEXT: pop {[[SRC1]]}
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; CHECK-NOLOLOMOV-NOT: mov [[TMP:r[0-7]]], [[SRC1:r[01]]]
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; CHECK-NOLOLOMOV: push {[[TMP]]}
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; CHECK-NOLOLOMOV-NEXT: pop {[[SRC2]]}
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; CHECK-NOLOLOMOV-LABEL: bar
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; CHECK-NOLOLOMOV-LABEL: fnend
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declare void @bar(i32, i32)
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define void @foo(i32 %a, i32 %b) {
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entry:
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call void @bar(i32 %b, i32 %a);
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ret void
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}
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