mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-25 12:12:47 +01:00
82cb0e3bb0
Summary: Relate bug: https://bugs.llvm.org/show_bug.cgi?id=37472 The shrink wrapping pass prematurally restores the stack, at a point where the stack might still be accessed. Taking an exception can cause the stack to be corrupted. As a first approach, this patch is overly conservative, assuming that any instruction that may load or store could access the stack. Reviewers: dmgreen, qcolombet Reviewed By: qcolombet Subscribers: simpal01, efriedma, eli.friedman, javed.absar, llvm-commits, eugenis, chill, carwil, thegameg Tags: #llvm Differential Revision: https://reviews.llvm.org/D63152 llvm-svn: 363265
95 lines
3.8 KiB
LLVM
95 lines
3.8 KiB
LLVM
; REQUIRES: asserts
|
|
; RUN: llc -mtriple=arm64-unknown-linux-gnu -debug-only=tailduplication %s -o /dev/null 2>&1 | FileCheck %s --check-prefix=LINUX
|
|
; RUN: llc -mtriple=arm64-apple-darwin -debug-only=tailduplication %s -o /dev/null 2>&1 | FileCheck %s --check-prefix=DARWIN
|
|
|
|
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
|
|
|
|
@g = common local_unnamed_addr global i32 0, align 4
|
|
@f = common local_unnamed_addr global i32 0, align 4
|
|
@a = common local_unnamed_addr global i32 0, align 4
|
|
@m = common local_unnamed_addr global i32 0, align 4
|
|
@l = common local_unnamed_addr global i32 0, align 4
|
|
@j = common local_unnamed_addr global i32 0, align 4
|
|
@k = common local_unnamed_addr global i32 0, align 4
|
|
@i = common local_unnamed_addr global i32 0, align 4
|
|
@d = common local_unnamed_addr global i32 0, align 4
|
|
@c = common local_unnamed_addr global i32 0, align 4
|
|
@e = common local_unnamed_addr global i32 0, align 4
|
|
@h = common local_unnamed_addr global i32 0, align 4
|
|
|
|
; Function Attrs: norecurse nounwind uwtable
|
|
define void @n(i32 %o, i32* nocapture readonly %b) local_unnamed_addr #0 {
|
|
entry:
|
|
%0 = load i32, i32* @g, align 4, !tbaa !2
|
|
%tobool = icmp eq i32 %0, 0
|
|
br i1 %tobool, label %entry.if.end_crit_edge, label %if.then
|
|
|
|
entry.if.end_crit_edge: ; preds = %entry
|
|
%.pre = load i32, i32* @f, align 4, !tbaa !2
|
|
br label %if.end
|
|
|
|
if.then: ; preds = %entry
|
|
store i32 0, i32* @f, align 4, !tbaa !2
|
|
br label %if.end
|
|
|
|
; DARWIN: Merging into block
|
|
; LINUX: Merging into block
|
|
|
|
if.end: ; preds = %entry.if.end_crit_edge, %if.then
|
|
%1 = phi i32 [ %.pre, %entry.if.end_crit_edge ], [ 0, %if.then ]
|
|
%cmp6 = icmp slt i32 %1, %o
|
|
br i1 %cmp6, label %for.body.lr.ph, label %for.end
|
|
|
|
for.body.lr.ph: ; preds = %if.end
|
|
%.pre7 = load i32, i32* @a, align 4, !tbaa !2
|
|
%.pre8 = load i32, i32* @l, align 4, !tbaa !2
|
|
%.pre9 = load i32, i32* @j, align 4, !tbaa !2
|
|
%.pre10 = load i32, i32* @k, align 4, !tbaa !2
|
|
%.pre11 = load i32, i32* @i, align 4, !tbaa !2
|
|
br label %for.body
|
|
|
|
for.body: ; preds = %if.end5, %for.body.lr.ph
|
|
%2 = phi i32 [ %.pre11, %for.body.lr.ph ], [ %7, %if.end5 ]
|
|
%3 = phi i32 [ %.pre10, %for.body.lr.ph ], [ %8, %if.end5 ]
|
|
%4 = phi i32 [ %.pre9, %for.body.lr.ph ], [ %9, %if.end5 ]
|
|
%5 = phi i32 [ %1, %for.body.lr.ph ], [ %inc, %if.end5 ]
|
|
store i32 %.pre7, i32* @m, align 4, !tbaa !2
|
|
%mul = mul nsw i32 %3, %4
|
|
%cmp1 = icmp sgt i32 %.pre8, %mul
|
|
%conv = zext i1 %cmp1 to i32
|
|
%cmp2 = icmp slt i32 %2, %conv
|
|
br i1 %cmp2, label %if.then4, label %if.end5
|
|
|
|
if.then4: ; preds = %for.body
|
|
%6 = load i32, i32* @d, align 4, !tbaa !2
|
|
store i32 %6, i32* @k, align 4, !tbaa !2
|
|
store i32 %6, i32* @i, align 4, !tbaa !2
|
|
store i32 %6, i32* @j, align 4, !tbaa !2
|
|
br label %if.end5
|
|
|
|
if.end5: ; preds = %if.then4, %for.body
|
|
%7 = phi i32 [ %6, %if.then4 ], [ %2, %for.body ]
|
|
%8 = phi i32 [ %6, %if.then4 ], [ %3, %for.body ]
|
|
%9 = phi i32 [ %6, %if.then4 ], [ %4, %for.body ]
|
|
%10 = load i32, i32* @c, align 4, !tbaa !2
|
|
%idxprom = sext i32 %10 to i64
|
|
%arrayidx = getelementptr inbounds i32, i32* %b, i64 %idxprom
|
|
%11 = load i32, i32* %arrayidx, align 4, !tbaa !2
|
|
%12 = load i32, i32* @e, align 4, !tbaa !2
|
|
%sub = sub nsw i32 %11, %12
|
|
store i32 %sub, i32* @h, align 4, !tbaa !2
|
|
%inc = add nsw i32 %5, 1
|
|
store i32 %inc, i32* @f, align 4, !tbaa !2
|
|
%exitcond = icmp eq i32 %inc, %o
|
|
br i1 %exitcond, label %for.end, label %for.body
|
|
|
|
for.end: ; preds = %if.end5, %if.end
|
|
ret void
|
|
}
|
|
|
|
attributes #0 = { norecurse nounwind uwtable }
|
|
|
|
!2 = !{!3, !3, i64 0}
|
|
!3 = !{!"int", !4, i64 0}
|
|
!4 = !{}
|