95 lines
3.6 KiB
Plaintext
95 lines
3.6 KiB
Plaintext
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# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
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# RUN: llc -mtriple s390x-ibm-linux -mcpu=z13 -systemz-subreg-liveness -verify-machineinstrs -start-before simple-register-coalescing -stop-after greedy -o - %s | FileCheck %s
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# Check that when we split the live-range with several active lanes
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# as part of the live-range update, we correctly eliminate the VNI from
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# the relevant part.
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#
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# In this specific test, the register coalescer will:
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# 1. Merge %0 with %1, creating a live-range for the full value subreg_l32 + subreg_h32
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# (actually %0 gets merge with %1 via rematerialization, and technically %0 and %1
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# remain two different live-ranges.)
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# 2. Merge %2 with %1 triggering a split into the subreg_l32 + subreg_h32 ranges, since
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# %2 only touches subreg_l32. As part of the split the subrange covering subreg_h32
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# must contain only the VNI for the high part (i.e., the one tied with the remaaat of %0).
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# This used to be broken and trigger a machine verifier error, because we were not
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# clearing the dead value w.r.t. lanes when doing the splitting. I.e., we were ending
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# with a subrange referring a value that did not define that lane.
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#
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# PR40835
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---
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name: main
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tracksRegLiveness: true
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body: |
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bb.0:
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; CHECK-LABEL: name: main
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; CHECK: [[LGHI:%[0-9]+]]:gr64bit = LGHI 43
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; CHECK: [[LGHI1:%[0-9]+]]:gr64bit = LGHI 43
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; CHECK: [[LGHI1]].subreg_l32:gr64bit = MSR [[LGHI1]].subreg_l32, [[LGHI1]].subreg_l32
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; CHECK: [[LGHI1]].subreg_l32:gr64bit = AHIMux [[LGHI1]].subreg_l32, 9, implicit-def dead $cc
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; CHECK: undef %3.subreg_l64:gr128bit = LGFI -245143785, implicit [[LGHI1]].subreg_l32
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; CHECK: [[DLGR:%[0-9]+]]:gr128bit = DLGR [[DLGR]], [[LGHI]]
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; CHECK: Return implicit [[DLGR]]
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%0:gr64bit = LGHI 43
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%1:gr32bit = COPY %0.subreg_l32
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%1:gr32bit = MSR %1, %1
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%2:gr32bit = COPY killed %1
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%2:gr32bit = AHIMux killed %2, 9, implicit-def dead $cc
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undef %3.subreg_l64:gr128bit = LGFI -245143785, implicit killed %2
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%3:gr128bit = DLGR %3:gr128bit, killed %0
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Return implicit killed %3
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...
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# Make sure the compiler does not choke on VNIs that don't
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# an explicit MI as definition.
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# In that specific example, this is the PHI not explicitly
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# represented for the value carried by %7.
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---
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name: segfault
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tracksRegLiveness: true
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liveins: []
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body: |
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; CHECK-LABEL: name: segfault
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; CHECK: bb.0:
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; CHECK: successors: %bb.1(0x80000000)
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; CHECK: [[LGHI:%[0-9]+]]:addr64bit = LGHI 0
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; CHECK: bb.1:
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; CHECK: successors: %bb.1(0x80000000)
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; CHECK: ADJCALLSTACKDOWN 0, 0
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; CHECK: [[LGFR:%[0-9]+]]:gr64bit = LGFR [[LGHI]].subreg_l32
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; CHECK: $r2d = LGHI 123
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; CHECK: $r3d = LGHI 0
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; CHECK: $r4d = LGHI 0
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; CHECK: $r5d = COPY [[LGFR]]
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; CHECK: KILL killed $r2d, killed $r3d, killed $r4d, $r5d, csr_systemz, implicit-def dead $r14d, implicit-def dead $cc
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; CHECK: ADJCALLSTACKUP 0, 0
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; CHECK: [[LGHI]]:addr64bit = nuw nsw LA [[LGHI]], 1, $noreg
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; CHECK: J %bb.1
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bb.0:
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successors: %bb.1(0x80000000)
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%2:gr64bit = LGHI 0
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%5:gr64bit = LGHI 123
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%7:addr64bit = COPY %2
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bb.1:
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successors: %bb.1(0x80000000)
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%0:addr64bit = COPY killed %7
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ADJCALLSTACKDOWN 0, 0
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%3:gr32bit = COPY %0.subreg_l32
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%4:gr64bit = LGFR killed %3
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$r2d = COPY %5
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$r3d = COPY %2
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$r4d = COPY %2
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$r5d = COPY killed %4
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KILL killed $r2d, killed $r3d, killed $r4d, killed $r5d, csr_systemz, implicit-def dead $r14d, implicit-def dead $cc
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ADJCALLSTACKUP 0, 0
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%1:gr64bit = nuw nsw LA killed %0, 1, $noreg
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%7:addr64bit = COPY killed %1
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J %bb.1
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...
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