--- |
; pr37472
; These test verify that shrink-wrap does not set the restore point
; to a position where the stack might still be accessed by a load or store
; RUN: llc -x=mir -simplify-mir -run-pass=shrink-wrap -o - %s | FileCheck %s
; CHECK: name: compiler_pop_stack
; CHECK: frameInfo:
; CHECK: savePoint: '%bb.1'
; CHECK: restorePoint: '%bb.7'
; CHECK: name: compiler_pop_stack_no_memoperands
; CHECK: frameInfo:
; CHECK: savePoint: '%bb.1'
; CHECK: restorePoint: '%bb.7'
; CHECK: name: f
; CHECK: frameInfo:
; CHECK: savePoint: '%bb.2'
; CHECK-NEXT: restorePoint: '%bb.4'
; CHECK-NEXT: stack:
target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
target triple = "aarch64"
%struct.S = type { i32, i32 }
; Test from: https://bugs.llvm.org/show_bug.cgi?id=42136
define void @compiler_pop_stack(i32 %num, i32 %dec) {
entry:
%rstack = alloca [16 x i32], align 4
%idxprom = zext i32 %dec to i64
%arrayidx2 = getelementptr inbounds [16 x i32], ptr %rstack, i64 0, i64 %idxprom
%sunkaddr = mul i64 %idxprom, 4
%sunkaddr2 = getelementptr inbounds i8, ptr %rstack, i64 %sunkaddr
ret void
}
define void @compiler_pop_stack_no_memoperands(i32 %num, i32 %dec) {
entry:
%rstack = alloca [16 x i32], align 4
%idxprom = zext i32 %dec to i64
%arrayidx2 = getelementptr inbounds [16 x i32], ptr %rstack, i64 0, i64 %idxprom
%sunkaddr = mul i64 %idxprom, 4
%sunkaddr2 = getelementptr inbounds i8, ptr %rstack, i64 %sunkaddr
ret void
}
; Test from: https://bugs.llvm.org/show_bug.cgi?id=37472
define i32 @f(ptr nocapture %arg, i32 %arg1) {
bb:
%tmp = alloca [4 x i8], align 1
%tmp6 = getelementptr inbounds [4 x i8], ptr %tmp, i64 0, i64 3
%sunkaddr = getelementptr inbounds i8, ptr %tmp, i64 3
%tmp14 = getelementptr inbounds %struct.S, ptr %arg, i64 0, i32 1
ret i32 0
}
...
---
name: compiler_pop_stack
alignment: 4
tracksRegLiveness: true
liveins:
- { reg: '$w0' }
frameInfo:
maxAlignment: 4
maxCallFrameSize: 0
localFrameSize: 64
stack:
- { id: 0, name: rstack, size: 64, alignment: 4, stack-id: default, local-offset: -64 }
machineFunctionInfo: {}
body: |
bb.0:
liveins: $w0
dead $wzr = SUBSWri renamable $w0, 2, 0, implicit-def $nzcv
Bcc 3, %bb.6, implicit killed $nzcv
B %bb.1
bb.1:
liveins: $w0
STRWui killed renamable $w0, %stack.0.rstack, 0 :: (volatile store (s32) into %ir.rstack)
renamable $w9 = MOVi32imm 1
renamable $x8 = ADDXri %stack.0.rstack, 0, 0
bb.2:
successors: %bb.3(0x30000000), %bb.4(0x50000000)
liveins: $w9, $x8
renamable $w10 = SUBWri renamable $w9, 1, 0, implicit-def $x10
renamable $w11 = LDRWroW renamable $x8, renamable $w10, 0, 1 :: (volatile load (s32) from %ir.arrayidx2)
CBNZW renamable $w11, %bb.4
bb.3:
liveins: $x8, $x10
renamable $w9 = COPY renamable $w10, implicit killed $x10
B %bb.5
bb.4:
liveins: $w9, $w11, $x8, $x10
STRWroX killed renamable $w11, renamable $x8, killed renamable $x10, 0, 1 :: (volatile store (s32) into %ir.sunkaddr2)
bb.5:
successors: %bb.6(0x04000000), %bb.2(0x7c000000)
liveins: $w9, $x8
CBNZW renamable $w9, %bb.2
B %bb.6
bb.6:
RET_ReallyLR
...
# Like compiler_pop_stack, but with the memory operands dropped from the
# machine instructions.
---
name: compiler_pop_stack_no_memoperands
alignment: 4
tracksRegLiveness: true
liveins:
- { reg: '$w0' }
frameInfo:
maxAlignment: 4
maxCallFrameSize: 0
localFrameSize: 64
stack:
- { id: 0, name: rstack, size: 64, alignment: 4, stack-id: default, local-offset: -64 }
machineFunctionInfo: {}
body: |
bb.0:
liveins: $w0
dead $wzr = SUBSWri renamable $w0, 2, 0, implicit-def $nzcv
Bcc 3, %bb.6, implicit killed $nzcv
B %bb.1
bb.1:
liveins: $w0
STRWui killed renamable $w0, %stack.0.rstack, 0
renamable $w9 = MOVi32imm 1
renamable $x8 = ADDXri %stack.0.rstack, 0, 0
bb.2:
successors: %bb.3(0x30000000), %bb.4(0x50000000)
liveins: $w9, $x8
renamable $w10 = SUBWri renamable $w9, 1, 0, implicit-def $x10
renamable $w11 = LDRWroW renamable $x8, renamable $w10, 0, 1
CBNZW renamable $w11, %bb.4
bb.3:
liveins: $x8, $x10
renamable $w9 = COPY renamable $w10, implicit killed $x10
B %bb.5
bb.4:
liveins: $w9, $w11, $x8, $x10
STRWroX killed renamable $w11, renamable $x8, killed renamable $x10, 0, 1
bb.5:
successors: %bb.6(0x04000000), %bb.2(0x7c000000)
liveins: $w9, $x8
CBNZW renamable $w9, %bb.2
B %bb.6
bb.6:
RET_ReallyLR
...
---
name: f
alignment: 4
tracksRegLiveness: true
liveins:
- { reg: '$x0' }
- { reg: '$w1' }
frameInfo:
maxAlignment: 4
maxCallFrameSize: 0
localFrameSize: 4
stack:
- { id: 0, name: tmp, size: 4, alignment: 4, stack-id: default, local-offset: -4 }
machineFunctionInfo: {}
body: |
bb.0:
successors: %bb.1, %bb.2
liveins: $w1, $x0
dead $wzr = SUBSWri renamable $w1, 4, 0, implicit-def $nzcv
Bcc 9, %bb.2, implicit killed $nzcv
bb.1:
renamable $w0 = MOVi32imm 1
B %bb.5
bb.2:
successors: %bb.3, %bb.4
liveins: $w1, $x0
renamable $w9 = MOVi32imm 67305985
renamable $w8 = ORRWrs $wzr, renamable $w1, 0, implicit-def $x8
STRWui killed renamable $w9, %stack.0.tmp, 0 :: (volatile store (s32) into %ir.tmp)
renamable $x9 = ADDXri %stack.0.tmp, 0, 0
renamable $w10 = LDRBBroX renamable $x9, renamable $x8, 0, 0 :: (volatile load (s8) from %ir.arg)
dead $wzr = SUBSWri killed renamable $w1, 2, 0, implicit-def $nzcv
STRWui killed renamable $w10, renamable $x0, 0 :: (store (s32) into %ir.arg)
Bcc 8, %bb.4, implicit killed $nzcv
B %bb.3
bb.3:
liveins: $x0, $x8, $x9
renamable $w8 = LDRBBroX killed renamable $x9, killed renamable $x8, 0, 0 :: (volatile load (s8) from %ir.sunkaddr)
STRWui killed renamable $w8, killed renamable $x0, 1 :: (store (s32) into %ir.tmp14)
bb.4:
renamable $w0 = COPY $wzr
bb.5:
liveins: $w0
RET_ReallyLR implicit $w0
...
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