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ba79f9fef9
On windows, the callee saved registers in a canonical prologue are ordered starting from a lower register number at a lower stack address (with the possible gap for aligning the stack at the top); this is the opposite order that llvm normally produces. To achieve this, reverse the order of the registers in the assignCalleeSavedSpillSlots callback, to get the stack objects laid out by PrologEpilogInserter in the right order, and adjust computeCalleeSaveRegisterPairs to lay them out from the bottom up. This allows generated prologs more often to match the format that allows the unwind info to be written as packed info. Differential Revision: https://reviews.llvm.org/D88677
147 lines
5.3 KiB
YAML
147 lines
5.3 KiB
YAML
# RUN: llc -O2 -o - %s -mtriple=aarch64-windows -start-before=shrink-wrap \
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# RUN: -stop-after=prologepilog | FileCheck %s --check-prefix=WIN64
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# RUN: llc -O2 -o - %s -mtriple=aarch64-linux -start-before=shrink-wrap \
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# RUN: -stop-after=prologepilog | FileCheck %s --check-prefix=LINUX
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# This tests checks that shrink wrapping bails out on Windows AMR64 due to the
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# use of Windows CFI. We don't currently support fragments for WIndows EH on
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# ARM64.
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# The same test gets shrink wrapped on Linux ARM64.
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# WIN64-LABEL: bb.0.entry:
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# WIN64: early-clobber $sp = frame-setup STRXpre killed $x19, $sp, -32
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# WIN64-LABEL: bb.1:
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# WIN64-LABEL: bb.2.if.then:
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# LINUX-LABEL: bb.0.entry:
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# LINUX-LABEL: bb.1:
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# LINUX-LABEL: bb.2.if.then:
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# LINUX: early-clobber $sp = frame-setup STRXpre killed $fp, $sp, -32
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--- |
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; ModuleID = 'shrink.cpp'
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target datalayout = "e-m:w-p:64:64-i32:32-i64:64-i128:128-n32:64-S128"
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target triple = "aarch64-unknown-windows-msvc19.11.0"
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define dso_local i32 @"?func@@YAHHH@Z"(i32 %a, i32 %b) local_unnamed_addr #0 {
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entry:
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%A = alloca [1000 x i32], align 4
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%cmp = icmp sgt i32 %a, 1
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br i1 %cmp, label %if.then, label %return
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if.then: ; preds = %entry
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%0 = bitcast [1000 x i32]* %A to i8*
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call void @llvm.lifetime.start.p0i8(i64 4000, i8* nonnull %0) #3
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%arraydecay2 = bitcast [1000 x i32]* %A to i32*
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call void @"?init@@YAXPEAH@Z"(i32* nonnull %arraydecay2)
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%arrayidx = getelementptr inbounds [1000 x i32], [1000 x i32]* %A, i64 0, i64 100
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%1 = load i32, i32* %arrayidx, align 4, !tbaa !2
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%add = add i32 %b, 1
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%add1 = add i32 %add, %1
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call void @llvm.lifetime.end.p0i8(i64 4000, i8* nonnull %0) #3
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br label %return
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return: ; preds = %entry, %if.then
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%retval.0 = phi i32 [ %add1, %if.then ], [ 0, %entry ]
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ret i32 %retval.0
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}
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; Function Attrs: argmemonly nounwind
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declare void @llvm.lifetime.start.p0i8(i64, i8* nocapture) #1
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declare dso_local void @"?init@@YAXPEAH@Z"(i32*) local_unnamed_addr #2
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; Function Attrs: argmemonly nounwind
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declare void @llvm.lifetime.end.p0i8(i64, i8* nocapture) #1
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; Function Attrs: nounwind
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declare void @llvm.stackprotector(i8*, i8**) #3
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attributes #0 = { "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "min-legal-vector-width"="0" "frame-pointer"="none" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="generic" "target-features"="+neon" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #1 = { argmemonly nounwind }
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attributes #2 = { "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "frame-pointer"="none" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="generic" "target-features"="+neon" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #3 = { nounwind }
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!llvm.module.flags = !{!0}
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!llvm.ident = !{!1}
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!0 = !{i32 1, !"wchar_size", i32 2}
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!1 = !{!"clang version 8.0.0"}
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!2 = !{!3, !3, i64 0}
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!3 = !{!"int", !4, i64 0}
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!4 = !{!"omnipotent char", !5, i64 0}
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!5 = !{!"Simple C++ TBAA"}
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...
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---
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name: '?func@@YAHHH@Z'
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alignment: 4
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exposesReturnsTwice: false
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legalized: false
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regBankSelected: false
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selected: false
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failedISel: false
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tracksRegLiveness: true
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registers:
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liveins:
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- { reg: '$w0', virtual-reg: '' }
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- { reg: '$w1', virtual-reg: '' }
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frameInfo:
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isFrameAddressTaken: false
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isReturnAddressTaken: false
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hasStackMap: false
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hasPatchPoint: false
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stackSize: 0
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offsetAdjustment: 0
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maxAlignment: 4
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adjustsStack: true
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hasCalls: true
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stackProtector: ''
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maxCallFrameSize: 0
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cvBytesOfCalleeSavedRegisters: 0
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hasOpaqueSPAdjustment: false
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hasVAStart: false
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hasMustTailInVarArgFunc: false
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localFrameSize: 4000
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savePoint: ''
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restorePoint: ''
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fixedStack:
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stack:
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- { id: 0, name: A, type: default, offset: 0, size: 4000, alignment: 4,
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stack-id: default, callee-saved-register: '', callee-saved-restored: true,
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local-offset: -4000, debug-info-variable: '', debug-info-expression: '',
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debug-info-location: '' }
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constants:
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body: |
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bb.0.entry:
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successors: %bb.2(0x40000000), %bb.1(0x40000000)
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liveins: $w0, $w1
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dead $wzr = SUBSWri killed renamable $w0, 2, 0, implicit-def $nzcv
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Bcc 10, %bb.2, implicit killed $nzcv
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bb.1:
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successors: %bb.3(0x80000000)
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renamable $w0 = COPY $wzr
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B %bb.3
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bb.2.if.then:
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successors: %bb.3(0x80000000)
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liveins: $w1
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renamable $w19 = COPY $w1
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ADJCALLSTACKDOWN 0, 0, implicit-def dead $sp, implicit $sp
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$x0 = ADDXri %stack.0.A, 0, 0
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BL @"?init@@YAXPEAH@Z", csr_aarch64_aapcs, implicit-def dead $lr, implicit $sp, implicit $x0, implicit-def $sp
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ADJCALLSTACKUP 0, 0, implicit-def dead $sp, implicit $sp
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renamable $w8 = LDRWui %stack.0.A, 100 :: (dereferenceable load 4 from %ir.arrayidx, !tbaa !2)
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renamable $w8 = ADDWrr killed renamable $w19, killed renamable $w8
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renamable $w0 = ADDWri killed renamable $w8, 1, 0
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bb.3.return:
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liveins: $w0
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RET_ReallyLR implicit $w0
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...
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