7c13ae6490
treated as Copy instruction in MCP. This is then used in AArch64 to remove copy instructions after taildup ran in machine block placement Differential Revision: https://reviews.llvm.org/D125335
116 lines
2.6 KiB
YAML
116 lines
2.6 KiB
YAML
# RUN: llc -mtriple=aarch64-linux-gnu -run-pass machine-cp -mcp-use-is-copy-instr -o - %s | FileCheck %s
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# Tests for MachineCopyPropagation copy forwarding.
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---
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# Simple forwarding.
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# CHECK-LABEL: name: test1
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# CHECK: $x0 = SUBXri $x0, 1, 0
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name: test1
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tracksRegLiveness: true
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body: |
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bb.0:
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liveins: $x0
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renamable $x1 = COPY $x0
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$x0 = SUBXri renamable $x1, 1, 0
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...
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---
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# Don't forward if not renamable.
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# CHECK-LABEL: name: test2
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# CHECK: $x0 = SUBXri $x1, 1, 0
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name: test2
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tracksRegLiveness: true
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body: |
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bb.0:
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liveins: $x0
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$x1 = COPY $x0
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$x0 = SUBXri $x1, 1, 0
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...
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---
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# Don't forward reserved non-constant reg values.
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# CHECK-LABEL: name: test4
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# CHECK: $x0 = SUBXri renamable $x1, 1, 0
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name: test4
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tracksRegLiveness: true
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body: |
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bb.0:
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liveins: $x0
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$sp = SUBXri $sp, 16, 0
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renamable $x1 = COPY $sp
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$x0 = SUBXri renamable $x1, 1, 0
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$sp = ADDXri $sp, 16, 0
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...
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---
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# Don't violate opcode constraints when forwarding.
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# CHECK-LABEL: name: test5
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# CHECK: $x0 = SUBXri renamable $x1, 1, 0
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name: test5
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tracksRegLiveness: true
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body: |
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bb.0:
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liveins: $x0
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renamable $x1 = COPY $xzr
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$x0 = SUBXri renamable $x1, 1, 0
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...
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---
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# Test cross-class COPY forwarding.
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# CHECK-LABEL: name: test6
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# CHECK: $x2 = COPY $x0
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name: test6
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tracksRegLiveness: true
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body: |
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bb.0:
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liveins: $x0
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renamable $d1 = COPY $x0
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$x2 = COPY renamable $d1
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RET_ReallyLR implicit $x2
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...
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---
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# Don't forward if there are overlapping implicit operands.
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# CHECK-LABEL: name: test7
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# CHECK: $w0 = SUBWri killed renamable $w1, 1, 0
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name: test7
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tracksRegLiveness: true
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body: |
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bb.0:
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liveins: $w0
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renamable $w1 = COPY $w0
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$w0 = SUBWri killed renamable $w1, 1, 0, implicit killed $x1
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...
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---
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# Check that kill flags are cleared.
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# CHECK-LABEL: name: test8
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# CHECK: $x2 = ADDXri $x0, 1, 0
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# CHECK: $x0 = SUBXri $x0, 1, 0
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name: test8
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tracksRegLiveness: true
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body: |
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bb.0:
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liveins: $x0
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renamable $x1 = COPY $x0
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$x2 = ADDXri killed $x0, 1, 0
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$x0 = SUBXri renamable $x1, 1, 0
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...
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---
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# Don't forward if value is clobbered.
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# CHECK-LABEL: name: test9
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# CHECK: $x2 = SUBXri renamable $x1, 1, 0
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name: test9
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tracksRegLiveness: true
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body: |
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bb.0:
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liveins: $x0
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renamable $x1 = COPY $x0
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$x0 = ADDXri $x0, 1, 0
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$x2 = SUBXri renamable $x1, 1, 0
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...
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---
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# CHECK-LABEL: name: test1_orr_as_copy
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# CHECK: STRBBui $wzr, killed renamable $x8, 36
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name: test1_orr_as_copy
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tracksRegLiveness: true
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body: |
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bb.0:
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liveins: $x8
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$w9 = ORRWrs $wzr, $wzr, 0
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STRBBui killed renamable $w9, killed renamable $x8, 36
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...
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