230 lines
6.7 KiB
YAML
230 lines
6.7 KiB
YAML
--- |
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; pr37472
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; These test verify that shrink-wrap does not set the restore point
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; to a position where the stack might still be accessed by a load or store
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; RUN: llc -x=mir -simplify-mir -run-pass=shrink-wrap -o - %s | FileCheck %s
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; CHECK: name: compiler_pop_stack
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; CHECK: frameInfo:
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; CHECK-NOT: savePoint:
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; CHECK-NOT: restorePoint:
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; CHECK: stack:
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; CHECK: name: f
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; CHECK: frameInfo:
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; CHECK: savePoint: '%bb.2'
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; CHECK-NEXT: restorePoint: '%bb.4'
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; CHECK-NEXT: stack:
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target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
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target triple = "aarch64-arm-none-eabi"
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%struct.S = type { i32, i32 }
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@__const.f.arr = private unnamed_addr constant [4 x i8] c"\01\02\03\04", align 1
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declare void @llvm.lifetime.start.p0i8(i64 immarg, i8* nocapture)
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declare void @llvm.lifetime.end.p0i8(i64 immarg, i8* nocapture)
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declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture writeonly, i8* nocapture readonly, i64, i1 immarg)
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; Test from: https://bugs.llvm.org/show_bug.cgi?id=42136
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define void @compiler_pop_stack(i32 %num) {
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entry:
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%rstack = alloca [16 x i32], align 4
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%tmp = bitcast [16 x i32]* %rstack to i8*
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call void @llvm.lifetime.start.p0i8(i64 64, i8* nonnull %tmp)
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%cmp = icmp ult i32 %num, 2
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br i1 %cmp, label %cleanup, label %if.end
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if.end:
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%arrayidx1 = bitcast [16 x i32]* %rstack to i32*
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store volatile i32 %num, i32* %arrayidx1, align 4
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br label %while.body
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while.body:
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%ptr.017 = phi i32 [ 1, %if.end ], [ %ptr.1, %if.end7 ]
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%dec = add i32 %ptr.017, -1
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%idxprom = zext i32 %dec to i64
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%arrayidx2 = getelementptr inbounds [16 x i32], [16 x i32]* %rstack, i64 0, i64 %idxprom
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%tmp1 = load volatile i32, i32* %arrayidx2, align 4
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%cmp3 = icmp eq i32 %tmp1, 0
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br i1 %cmp3, label %if.end7, label %if.then4
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if.then4:
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%sunkaddr = mul i64 %idxprom, 4
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%0 = bitcast [16 x i32]* %rstack to i8*
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%sunkaddr2 = getelementptr inbounds i8, i8* %0, i64 %sunkaddr
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%1 = bitcast i8* %sunkaddr2 to i32*
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store volatile i32 %tmp1, i32* %1, align 4
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br label %if.end7
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if.end7:
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%ptr.1 = phi i32 [ %ptr.017, %if.then4 ], [ %dec, %while.body ]
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%cmp1 = icmp eq i32 %ptr.1, 0
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br i1 %cmp1, label %cleanup, label %while.body
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cleanup:
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%2 = bitcast [16 x i32]* %rstack to i8*
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call void @llvm.lifetime.end.p0i8(i64 64, i8* nonnull %2)
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ret void
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}
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; Test from: https://bugs.llvm.org/show_bug.cgi?id=37472
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define i32 @f(%struct.S* nocapture %arg, i32 %arg1) {
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bb:
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%tmp = alloca [4 x i8], align 1
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%tmp2 = icmp ugt i32 %arg1, 4
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br i1 %tmp2, label %bb16, label %bb3
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bb3:
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%tmp41 = bitcast [4 x i8]* %tmp to i8*
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call void @llvm.lifetime.start.p0i8(i64 4, i8* nonnull %tmp41)
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call void @llvm.memcpy.p0i8.p0i8.i64(i8* nonnull align 1 %tmp41, i8* align 1 getelementptr inbounds ([4 x i8], [4 x i8]* @__const.f.arr, i64 0, i64 0), i64 4, i1 true)
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%tmp5 = zext i32 %arg1 to i64
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%tmp6 = getelementptr inbounds [4 x i8], [4 x i8]* %tmp, i64 0, i64 %tmp5
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%tmp7 = load volatile i8, i8* %tmp6, align 1
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%tmp8 = zext i8 %tmp7 to i32
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%tmp92 = bitcast %struct.S* %arg to i32*
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store i32 %tmp8, i32* %tmp92, align 4
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%tmp10 = icmp ult i32 %arg1, 3
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br i1 %tmp10, label %bb11, label %bb15
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bb11:
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%0 = bitcast [4 x i8]* %tmp to i8*
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%sunkaddr = getelementptr inbounds i8, i8* %0, i64 %tmp5
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%tmp12 = load volatile i8, i8* %sunkaddr, align 1
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%tmp13 = zext i8 %tmp12 to i32
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%tmp14 = getelementptr inbounds %struct.S, %struct.S* %arg, i64 0, i32 1
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store i32 %tmp13, i32* %tmp14, align 4
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br label %bb15
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bb15:
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%1 = bitcast [4 x i8]* %tmp to i8*
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call void @llvm.lifetime.end.p0i8(i64 4, i8* nonnull %1)
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br label %bb16
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bb16:
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%tmp17 = phi i32 [ 0, %bb15 ], [ 1, %bb ]
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ret i32 %tmp17
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}
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declare void @llvm.stackprotector(i8*, i8**)
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...
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---
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name: compiler_pop_stack
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alignment: 4
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tracksRegLiveness: true
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liveins:
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- { reg: '$w0' }
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frameInfo:
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maxAlignment: 4
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maxCallFrameSize: 0
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localFrameSize: 64
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stack:
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- { id: 0, name: rstack, size: 64, alignment: 4, stack-id: default, local-offset: -64 }
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machineFunctionInfo: {}
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body: |
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bb.0.entry:
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liveins: $w0
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dead $wzr = SUBSWri renamable $w0, 2, 0, implicit-def $nzcv
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Bcc 3, %bb.6, implicit killed $nzcv
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B %bb.1
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bb.1.if.end:
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liveins: $w0
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STRWui killed renamable $w0, %stack.0.rstack, 0 :: (volatile store 4 into %ir.arrayidx1)
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renamable $w9 = MOVi32imm 1
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renamable $x8 = ADDXri %stack.0.rstack, 0, 0
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bb.2.while.body:
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successors: %bb.3(0x30000000), %bb.4(0x50000000)
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liveins: $w9, $x8
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renamable $w10 = SUBWri renamable $w9, 1, 0, implicit-def $x10
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renamable $w11 = LDRWroW renamable $x8, renamable $w10, 0, 1 :: (volatile load 4 from %ir.arrayidx2)
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CBNZW renamable $w11, %bb.4
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bb.3:
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liveins: $x8, $x10
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renamable $w9 = COPY renamable $w10, implicit killed $x10
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B %bb.5
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bb.4.if.then4:
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liveins: $w9, $w11, $x8, $x10
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STRWroX killed renamable $w11, renamable $x8, killed renamable $x10, 0, 1 :: (volatile store 4 into %ir.1)
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bb.5.if.end7:
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successors: %bb.6(0x04000000), %bb.2(0x7c000000)
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liveins: $w9, $x8
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CBNZW renamable $w9, %bb.2
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B %bb.6
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bb.6.cleanup:
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RET_ReallyLR
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...
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---
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name: f
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alignment: 4
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tracksRegLiveness: true
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liveins:
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- { reg: '$x0' }
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- { reg: '$w1' }
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frameInfo:
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maxAlignment: 4
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maxCallFrameSize: 0
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localFrameSize: 4
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stack:
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- { id: 0, name: tmp, size: 4, alignment: 4, stack-id: default, local-offset: -4 }
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machineFunctionInfo: {}
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body: |
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bb.0.bb:
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successors: %bb.1, %bb.2
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liveins: $w1, $x0
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dead $wzr = SUBSWri renamable $w1, 4, 0, implicit-def $nzcv
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Bcc 9, %bb.2, implicit killed $nzcv
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bb.1:
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renamable $w0 = MOVi32imm 1
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B %bb.5
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bb.2.bb3:
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successors: %bb.3, %bb.4
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liveins: $w1, $x0
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renamable $w9 = MOVi32imm 67305985
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renamable $w8 = ORRWrs $wzr, renamable $w1, 0, implicit-def $x8
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STRWui killed renamable $w9, %stack.0.tmp, 0 :: (volatile store 4 into %ir.tmp41)
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renamable $x9 = ADDXri %stack.0.tmp, 0, 0
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renamable $w10 = LDRBBroX renamable $x9, renamable $x8, 0, 0 :: (volatile load 1 from %ir.tmp6)
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dead $wzr = SUBSWri killed renamable $w1, 2, 0, implicit-def $nzcv
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STRWui killed renamable $w10, renamable $x0, 0 :: (store 4 into %ir.tmp92)
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Bcc 8, %bb.4, implicit killed $nzcv
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B %bb.3
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bb.3.bb11:
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liveins: $x0, $x8, $x9
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renamable $w8 = LDRBBroX killed renamable $x9, killed renamable $x8, 0, 0 :: (volatile load 1 from %ir.sunkaddr)
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STRWui killed renamable $w8, killed renamable $x0, 1 :: (store 4 into %ir.tmp14)
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bb.4.bb15:
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renamable $w0 = COPY $wzr
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bb.5.bb16:
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liveins: $w0
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RET_ReallyLR implicit $w0
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...
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