16b7cc69ef
On SystemZ, the outgoing argument area which is big enough for all calls in the function is created once during the prolog, as opposed to adjusting the stack around each call. The call-sequence instructions are therefore not really useful any more than to compute the maximum call frame size, which has so far been done by PEI, but can just as well be done at an earlier point. This patch removes the mapping of the CallFrameSetupOpcode and CallFrameDestroyOpcode and instead computes the MaxCallFrameSize directly after instruction selection and then removes the ADJCALLSTACK pseudos. This removes the confusing pseudos and also avoids the problem of having to keep the call frame size accurate when creating new MBBs. This fixes #76618 which exposed the need to maintain the call frame size when splitting blocks (which was not done).
54 lines
1.4 KiB
YAML
54 lines
1.4 KiB
YAML
# RUN: llc -mtriple=s390x-linux-gnu -mcpu=z15 -start-before=greedy %s -o - \
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# RUN: | FileCheck %s
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#
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# Test that two-address reg alloc hints are given so that a SELR becomes LOCR.
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--- |
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define i32 @fun(i32 %arg, i32 %arg1, i32 %arg2, ptr %arg3) { ret i32 0 }
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declare void @foo(i32)
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...
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# CHECK-LABEL: fun
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# CHECK: locr
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---
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name: fun
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alignment: 16
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tracksRegLiveness: true
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registers:
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- { id: 0, class: gr32bit }
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- { id: 1, class: gr32bit }
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- { id: 2, class: gr32bit }
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- { id: 3, class: gr32bit }
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- { id: 4, class: gr64bit }
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- { id: 5, class: grx32bit }
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- { id: 6, class: grx32bit }
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- { id: 7, class: addr64bit }
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- { id: 8, class: grx32bit }
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- { id: 9, class: grx32bit }
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- { id: 10, class: gr64bit }
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- { id: 11, class: gr32bit }
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frameInfo:
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maxAlignment: 1
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adjustsStack: true
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hasCalls: true
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machineFunctionInfo: {}
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body: |
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bb.0:
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%5:grx32bit = LHIMux 88
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%8:grx32bit = LHIMux 77
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%9:grx32bit = LHIMux 66
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bb.1:
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%6:grx32bit = LLCMux undef %7:addr64bit, 0, $noreg :: (load (s8) from `ptr undef`)
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CHIMux %6, 1, implicit-def $cc
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%11:gr32bit = SELRMux %8, %9:grx32bit, 14, 6, implicit killed $cc
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CHIMux %6, 2, implicit-def $cc
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%0:gr32bit = SELRMux %11, %5, 14, 8, implicit killed $cc
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%10:gr64bit = LGFR %0
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$r2d = COPY %10
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CallBRASL @foo, killed $r2d, csr_systemz_elf, implicit-def dead $r14d, implicit-def dead $cc, implicit $fpc
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J %bb.1
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...
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