[AlignmentFromAssumptions] Don't crash just because the target is 32-bit

We used to crash processing any relevant @llvm.assume on a 32-bit target
(because we'd ask SE to subtract expressions of differing types). I've copied
our 'simple.ll' test, but with the data layout from arm-linux-gnueabihf to get
some meaningful test coverage here.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217574 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Hal Finkel 2014-09-11 08:40:17 +00:00
parent 65aac0f8e3
commit 2c1a4875e8
2 changed files with 219 additions and 0 deletions

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@ -141,6 +141,10 @@ static unsigned getNewAlignment(const SCEV *AASCEV, const SCEV *AlignSCEV,
const SCEV *PtrSCEV = SE->getSCEV(Ptr);
const SCEV *DiffSCEV = SE->getMinusSCEV(PtrSCEV, AASCEV);
// On 32-bit platforms, DiffSCEV might now have type i32 -- we've always
// sign-extended OffSCEV to i64, so make sure they agree again.
DiffSCEV = SE->getNoopOrSignExtend(DiffSCEV, OffSCEV->getType());
// What we really want to know is the overall offset to the aligned
// address. This address is displaced by the provided offset.
DiffSCEV = SE->getMinusSCEV(DiffSCEV, OffSCEV);

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@ -0,0 +1,215 @@
target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-n32-S64"
; RUN: opt < %s -alignment-from-assumptions -S | FileCheck %s
define i32 @foo(i32* nocapture %a) nounwind uwtable readonly {
entry:
%ptrint = ptrtoint i32* %a to i64
%maskedptr = and i64 %ptrint, 31
%maskcond = icmp eq i64 %maskedptr, 0
tail call void @llvm.assume(i1 %maskcond)
%0 = load i32* %a, align 4
ret i32 %0
; CHECK-LABEL: @foo
; CHECK: load i32* {{[^,]+}}, align 32
; CHECK: ret i32
}
define i32 @foo2(i32* nocapture %a) nounwind uwtable readonly {
entry:
%ptrint = ptrtoint i32* %a to i64
%offsetptr = add i64 %ptrint, 24
%maskedptr = and i64 %offsetptr, 31
%maskcond = icmp eq i64 %maskedptr, 0
tail call void @llvm.assume(i1 %maskcond)
%arrayidx = getelementptr inbounds i32* %a, i64 2
%0 = load i32* %arrayidx, align 4
ret i32 %0
; CHECK-LABEL: @foo2
; CHECK: load i32* {{[^,]+}}, align 16
; CHECK: ret i32
}
define i32 @foo2a(i32* nocapture %a) nounwind uwtable readonly {
entry:
%ptrint = ptrtoint i32* %a to i64
%offsetptr = add i64 %ptrint, 28
%maskedptr = and i64 %offsetptr, 31
%maskcond = icmp eq i64 %maskedptr, 0
tail call void @llvm.assume(i1 %maskcond)
%arrayidx = getelementptr inbounds i32* %a, i64 -1
%0 = load i32* %arrayidx, align 4
ret i32 %0
; CHECK-LABEL: @foo2a
; CHECK: load i32* {{[^,]+}}, align 32
; CHECK: ret i32
}
define i32 @goo(i32* nocapture %a) nounwind uwtable readonly {
entry:
%ptrint = ptrtoint i32* %a to i64
%maskedptr = and i64 %ptrint, 31
%maskcond = icmp eq i64 %maskedptr, 0
tail call void @llvm.assume(i1 %maskcond)
%0 = load i32* %a, align 4
ret i32 %0
; CHECK-LABEL: @goo
; CHECK: load i32* {{[^,]+}}, align 32
; CHECK: ret i32
}
define i32 @hoo(i32* nocapture %a) nounwind uwtable readonly {
entry:
%ptrint = ptrtoint i32* %a to i64
%maskedptr = and i64 %ptrint, 31
%maskcond = icmp eq i64 %maskedptr, 0
tail call void @llvm.assume(i1 %maskcond)
br label %for.body
for.body: ; preds = %entry, %for.body
%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
%r.06 = phi i32 [ 0, %entry ], [ %add, %for.body ]
%arrayidx = getelementptr inbounds i32* %a, i64 %indvars.iv
%0 = load i32* %arrayidx, align 4
%add = add nsw i32 %0, %r.06
%indvars.iv.next = add i64 %indvars.iv, 8
%1 = trunc i64 %indvars.iv.next to i32
%cmp = icmp slt i32 %1, 2048
br i1 %cmp, label %for.body, label %for.end
for.end: ; preds = %for.body
%add.lcssa = phi i32 [ %add, %for.body ]
ret i32 %add.lcssa
; CHECK-LABEL: @hoo
; CHECK: load i32* %arrayidx, align 32
; CHECK: ret i32 %add.lcssa
}
define i32 @joo(i32* nocapture %a) nounwind uwtable readonly {
entry:
%ptrint = ptrtoint i32* %a to i64
%maskedptr = and i64 %ptrint, 31
%maskcond = icmp eq i64 %maskedptr, 0
tail call void @llvm.assume(i1 %maskcond)
br label %for.body
for.body: ; preds = %entry, %for.body
%indvars.iv = phi i64 [ 4, %entry ], [ %indvars.iv.next, %for.body ]
%r.06 = phi i32 [ 0, %entry ], [ %add, %for.body ]
%arrayidx = getelementptr inbounds i32* %a, i64 %indvars.iv
%0 = load i32* %arrayidx, align 4
%add = add nsw i32 %0, %r.06
%indvars.iv.next = add i64 %indvars.iv, 8
%1 = trunc i64 %indvars.iv.next to i32
%cmp = icmp slt i32 %1, 2048
br i1 %cmp, label %for.body, label %for.end
for.end: ; preds = %for.body
%add.lcssa = phi i32 [ %add, %for.body ]
ret i32 %add.lcssa
; CHECK-LABEL: @joo
; CHECK: load i32* %arrayidx, align 16
; CHECK: ret i32 %add.lcssa
}
define i32 @koo(i32* nocapture %a) nounwind uwtable readonly {
entry:
%ptrint = ptrtoint i32* %a to i64
%maskedptr = and i64 %ptrint, 31
%maskcond = icmp eq i64 %maskedptr, 0
tail call void @llvm.assume(i1 %maskcond)
br label %for.body
for.body: ; preds = %entry, %for.body
%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
%r.06 = phi i32 [ 0, %entry ], [ %add, %for.body ]
%arrayidx = getelementptr inbounds i32* %a, i64 %indvars.iv
%0 = load i32* %arrayidx, align 4
%add = add nsw i32 %0, %r.06
%indvars.iv.next = add i64 %indvars.iv, 4
%1 = trunc i64 %indvars.iv.next to i32
%cmp = icmp slt i32 %1, 2048
br i1 %cmp, label %for.body, label %for.end
for.end: ; preds = %for.body
%add.lcssa = phi i32 [ %add, %for.body ]
ret i32 %add.lcssa
; CHECK-LABEL: @koo
; CHECK: load i32* %arrayidx, align 16
; CHECK: ret i32 %add.lcssa
}
define i32 @koo2(i32* nocapture %a) nounwind uwtable readonly {
entry:
%ptrint = ptrtoint i32* %a to i64
%maskedptr = and i64 %ptrint, 31
%maskcond = icmp eq i64 %maskedptr, 0
tail call void @llvm.assume(i1 %maskcond)
br label %for.body
for.body: ; preds = %entry, %for.body
%indvars.iv = phi i64 [ -4, %entry ], [ %indvars.iv.next, %for.body ]
%r.06 = phi i32 [ 0, %entry ], [ %add, %for.body ]
%arrayidx = getelementptr inbounds i32* %a, i64 %indvars.iv
%0 = load i32* %arrayidx, align 4
%add = add nsw i32 %0, %r.06
%indvars.iv.next = add i64 %indvars.iv, 4
%1 = trunc i64 %indvars.iv.next to i32
%cmp = icmp slt i32 %1, 2048
br i1 %cmp, label %for.body, label %for.end
for.end: ; preds = %for.body
%add.lcssa = phi i32 [ %add, %for.body ]
ret i32 %add.lcssa
; CHECK-LABEL: @koo2
; CHECK: load i32* %arrayidx, align 16
; CHECK: ret i32 %add.lcssa
}
define i32 @moo(i32* nocapture %a) nounwind uwtable {
entry:
%ptrint = ptrtoint i32* %a to i64
%maskedptr = and i64 %ptrint, 31
%maskcond = icmp eq i64 %maskedptr, 0
tail call void @llvm.assume(i1 %maskcond)
%0 = bitcast i32* %a to i8*
tail call void @llvm.memset.p0i8.i64(i8* %0, i8 0, i64 64, i32 4, i1 false)
ret i32 undef
; CHECK-LABEL: @moo
; CHECK: @llvm.memset.p0i8.i64(i8* %0, i8 0, i64 64, i32 32, i1 false)
; CHECK: ret i32 undef
}
define i32 @moo2(i32* nocapture %a, i32* nocapture %b) nounwind uwtable {
entry:
%ptrint = ptrtoint i32* %a to i64
%maskedptr = and i64 %ptrint, 31
%maskcond = icmp eq i64 %maskedptr, 0
tail call void @llvm.assume(i1 %maskcond)
%ptrint1 = ptrtoint i32* %b to i64
%maskedptr3 = and i64 %ptrint1, 127
%maskcond4 = icmp eq i64 %maskedptr3, 0
tail call void @llvm.assume(i1 %maskcond4)
%0 = bitcast i32* %a to i8*
%1 = bitcast i32* %b to i8*
tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* %0, i8* %1, i64 64, i32 4, i1 false)
ret i32 undef
; CHECK-LABEL: @moo2
; CHECK: @llvm.memcpy.p0i8.p0i8.i64(i8* %0, i8* %1, i64 64, i32 32, i1 false)
; CHECK: ret i32 undef
}
declare void @llvm.assume(i1) nounwind
declare void @llvm.memset.p0i8.i64(i8* nocapture, i8, i64, i32, i1) nounwind
declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture, i64, i32, i1) nounwind