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).
75 lines
1.9 KiB
YAML
75 lines
1.9 KiB
YAML
# RUN: llc -mtriple=s390x-linux-gnu -mcpu=z13 -start-before=greedy %s -o - \
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# RUN: | FileCheck %s
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#
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# Test that regalloc manages (via regalloc hints) to avoid a LOCRMux jump
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# sequence expansion.
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--- |
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declare ptr @foo(ptr, i32 signext, i32 signext) local_unnamed_addr
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define ptr @fun(ptr returned) {
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br label %2
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; <label>:2: ; preds = %6, %1
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%3 = zext i16 undef to i32
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switch i32 %3, label %4 [
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i32 15, label %6
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i32 125, label %5
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]
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; <label>:4: ; preds = %2
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br label %6
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; <label>:5: ; preds = %2
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br label %6
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; <label>:6: ; preds = %5, %4, %2
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%7 = phi i32 [ 4, %2 ], [ undef, %4 ], [ 10, %5 ]
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%8 = call ptr @foo(ptr undef, i32 signext undef, i32 signext %7)
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br label %2
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}
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...
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# CHECK: locr
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# CHECK-NOT: risblg
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---
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name: fun
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alignment: 4
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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: gr64bit }
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- { id: 2, class: grx32bit }
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- { id: 3, class: grx32bit }
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- { id: 4, class: grx32bit }
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- { id: 5, class: grx32bit }
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- { id: 6, class: grx32bit }
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- { id: 7, class: gr64bit }
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- { id: 8, class: gr64bit }
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- { id: 9, class: gr64bit }
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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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adjustsStack: true
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hasCalls: true
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body: |
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bb.0 (%ir-block.1):
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%3 = LHIMux 0
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%2 = LHIMux 4
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%5 = LHIMux 10
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bb.1 (%ir-block.2):
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CHIMux %3, 0, implicit-def $cc
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%0 = LOCRMux undef %0, %5, 14, 6, implicit $cc
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%0 = LOCRMux %0, %2, 14, 6, implicit killed $cc
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%7 = LGFR %0
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$r3d = LGHI 0
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$r4d = COPY %7
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CallBRASL @foo, undef $r2d, killed $r3d, killed $r4d, csr_systemz_elf, implicit-def dead $r14d, implicit-def dead $cc, implicit-def dead $r2d
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J %bb.1
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...
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