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MachineCopyPropagation::CopyPropagateBlock has a bunch of special handling for COPY instructions. This handling assumes that COPY instructions do not modify the source of the copy; this is wrong if the COPY destination overlaps the source. To fix the bug, check explicitly for this situation, and fall back to the generic instruction handling. This bug can't happen for most register classes because they don't have this sort of overlap, but there are a few register classes where this is possible. The testcase uses the AArch64 QQQQ register class. Differential Revision: https://reviews.llvm.org/D44911 llvm-svn: 328851
100 lines
2.6 KiB
YAML
100 lines
2.6 KiB
YAML
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# RUN: llc -mtriple=aarch64-none-linux-gnu -run-pass machine-cp -verify-machineinstrs -o - %s | FileCheck %s
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--- |
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define i32 @copyprop1(i32 %a, i32 %b) { ret i32 %a }
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define i32 @copyprop2(i32 %a, i32 %b) { ret i32 %a }
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define i32 @copyprop3(i32 %a, i32 %b) { ret i32 %a }
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define i32 @copyprop4(i32 %a, i32 %b) { ret i32 %a }
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define i32 @copyprop5(i32 %a, i32 %b) { ret i32 %a }
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define i32 @copyprop6(i32 %a, i32 %b) { ret i32 %a }
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declare i32 @foo(i32)
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...
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---
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# The first copy is dead copy which is not used.
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# CHECK-LABEL: name: copyprop1
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# CHECK: bb.0:
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# CHECK-NOT: $w20 = COPY
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name: copyprop1
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body: |
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bb.0:
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liveins: $w0, $w1
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$w20 = COPY $w1
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BL @foo, csr_aarch64_aapcs, implicit $w0, implicit-def $w0
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RET_ReallyLR implicit $w0
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...
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---
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# The first copy is not a dead copy which is used in the second copy after the
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# call.
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# CHECK-LABEL: name: copyprop2
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# CHECK: bb.0:
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# CHECK: $w20 = COPY
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name: copyprop2
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body: |
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bb.0:
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liveins: $w0, $w1
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$w20 = COPY $w1
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BL @foo, csr_aarch64_aapcs, implicit $w0, implicit-def $w0
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$w0 = COPY $w20
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RET_ReallyLR implicit $w0
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...
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---
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# Both the first and second copy are dead copies which are not used.
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# CHECK-LABEL: name: copyprop3
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# CHECK: bb.0:
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# CHECK-NOT: COPY
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name: copyprop3
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body: |
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bb.0:
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liveins: $w0, $w1
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$w20 = COPY $w1
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BL @foo, csr_aarch64_aapcs, implicit $w0, implicit-def $w0
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$w20 = COPY $w0
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RET_ReallyLR implicit $w0
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...
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# The second copy is removed as a NOP copy, after then the first copy become
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# dead which should be removed as well.
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# CHECK-LABEL: name: copyprop4
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# CHECK: bb.0:
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# CHECK-NOT: COPY
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name: copyprop4
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body: |
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bb.0:
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liveins: $w0, $w1
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$w20 = COPY $w0
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$w0 = COPY $w20
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BL @foo, csr_aarch64_aapcs, implicit $w0, implicit-def $w0
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RET_ReallyLR implicit $w0
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...
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# Don't try to erase any COPY which overlaps itself.
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# CHECK-LABEL: name: copyprop5
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# CHECK: bb.0:
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# CHECK: COPY killed $q26_q27_q28_q29
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# CHECK: COPY killed $q28_q29_q30_q31
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name: copyprop5
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body: |
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bb.0:
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liveins: $q26_q27_q28_q29
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$q28_q29_q30_q31 = COPY killed $q26_q27_q28_q29
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$q26_q27_q28_q29 = COPY killed $q28_q29_q30_q31
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BL @foo, csr_aarch64_aapcs, implicit killed $q26_q27_q28_q29
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RET_ReallyLR
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...
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# Don't try to analyze any COPY which overlaps itself.
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# CHECK-LABEL: name: copyprop6
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# CHECK: bb.0:
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# CHECK: COPY killed $q26_q27_q28_q29
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# CHECK: $q30 = COPY $q28
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name: copyprop6
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body: |
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bb.0:
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liveins: $q26_q27_q28_q29
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$q28_q29_q30_q31 = COPY killed $q26_q27_q28_q29
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$q30 = COPY $q28
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BL @foo, csr_aarch64_aapcs, implicit killed $q28_q29_q30_q31
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RET_ReallyLR
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...
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