llvm-6502/test/Analysis/DependenceAnalysis/ExactSIV.ll
Sebastian Pop ad43499fc4 dependence analysis
Patch from Preston Briggs <preston.briggs@gmail.com>.

This is an updated version of the dependence-analysis patch, including an MIV
test based on Banerjee's inequalities.

It's a fairly complete implementation of the paper

    Practical Dependence Testing
    Gina Goff, Ken Kennedy, and Chau-Wen Tseng
    PLDI 1991

It cannot yet propagate constraints between coupled RDIV subscripts (discussed
in Section 5.3.2 of the paper).

It's organized as a FunctionPass with a single entry point that supports testing
for dependence between two instructions in a function. If there's no dependence,
it returns null. If there's a dependence, it returns a pointer to a Dependence
which can be queried about details (what kind of dependence, is it loop
independent, direction and distance vector entries, etc). I haven't included
every imaginable feature, but there's a good selection that should be adequate
for supporting many loop transformations. Of course, it can be extended as
necessary.

Included in the patch file are many test cases, commented with C code showing
the loops and array references.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@165708 91177308-0d34-0410-b5e6-96231b3b80d8
2012-10-11 07:32:34 +00:00

429 lines
14 KiB
LLVM

; RUN: opt < %s -analyze -basicaa -da | FileCheck %s
; ModuleID = 'ExactSIV.bc'
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
target triple = "x86_64-apple-macosx10.6.0"
;; for (long unsigned i = 0; i < 10; i++) {
;; A[i + 10] = ...
;; ... = A[2*i + 1];
define void @exact0(i32* %A, i32* %B) nounwind uwtable ssp {
entry:
br label %for.body
for.body: ; preds = %for.body, %entry
%i.02 = phi i64 [ 0, %entry ], [ %inc, %for.body ]
%B.addr.01 = phi i32* [ %B, %entry ], [ %incdec.ptr, %for.body ]
%conv = trunc i64 %i.02 to i32
%add = add i64 %i.02, 10
%arrayidx = getelementptr inbounds i32* %A, i64 %add
store i32 %conv, i32* %arrayidx, align 4
%mul = shl i64 %i.02, 1
%add13 = or i64 %mul, 1
%arrayidx2 = getelementptr inbounds i32* %A, i64 %add13
%0 = load i32* %arrayidx2, align 4
; CHECK: da analyze - flow [<=|<]!
%incdec.ptr = getelementptr inbounds i32* %B.addr.01, i64 1
store i32 %0, i32* %B.addr.01, align 4
%inc = add i64 %i.02, 1
%cmp = icmp ult i64 %inc, 10
br i1 %cmp, label %for.body, label %for.end
for.end: ; preds = %for.body
ret void
}
;; for (long unsigned i = 0; i < 10; i++) {
;; A[4*i + 10] = ...
;; ... = A[2*i + 1];
define void @exact1(i32* %A, i32* %B) nounwind uwtable ssp {
entry:
br label %for.body
for.body: ; preds = %for.body, %entry
%i.02 = phi i64 [ 0, %entry ], [ %inc, %for.body ]
%B.addr.01 = phi i32* [ %B, %entry ], [ %incdec.ptr, %for.body ]
%conv = trunc i64 %i.02 to i32
%mul = shl i64 %i.02, 2
%add = add i64 %mul, 10
%arrayidx = getelementptr inbounds i32* %A, i64 %add
store i32 %conv, i32* %arrayidx, align 4
%mul1 = shl i64 %i.02, 1
%add23 = or i64 %mul1, 1
%arrayidx3 = getelementptr inbounds i32* %A, i64 %add23
%0 = load i32* %arrayidx3, align 4
; CHECK: da analyze - none!
%incdec.ptr = getelementptr inbounds i32* %B.addr.01, i64 1
store i32 %0, i32* %B.addr.01, align 4
%inc = add i64 %i.02, 1
%cmp = icmp ult i64 %inc, 10
br i1 %cmp, label %for.body, label %for.end
for.end: ; preds = %for.body
ret void
}
;; for (long unsigned i = 0; i < 10; i++) {
;; A[6*i] = ...
;; ... = A[i + 60];
define void @exact2(i32* %A, i32* %B) nounwind uwtable ssp {
entry:
br label %for.body
for.body: ; preds = %for.body, %entry
%i.02 = phi i64 [ 0, %entry ], [ %inc, %for.body ]
%B.addr.01 = phi i32* [ %B, %entry ], [ %incdec.ptr, %for.body ]
%conv = trunc i64 %i.02 to i32
%mul = mul i64 %i.02, 6
%arrayidx = getelementptr inbounds i32* %A, i64 %mul
store i32 %conv, i32* %arrayidx, align 4
%add = add i64 %i.02, 60
%arrayidx1 = getelementptr inbounds i32* %A, i64 %add
%0 = load i32* %arrayidx1, align 4
; CHECK: da analyze - none!
%incdec.ptr = getelementptr inbounds i32* %B.addr.01, i64 1
store i32 %0, i32* %B.addr.01, align 4
%inc = add i64 %i.02, 1
%cmp = icmp ult i64 %inc, 10
br i1 %cmp, label %for.body, label %for.end
for.end: ; preds = %for.body
ret void
}
;; for (long unsigned i = 0; i <= 10; i++) {
;; A[6*i] = ...
;; ... = A[i + 60];
define void @exact3(i32* %A, i32* %B) nounwind uwtable ssp {
entry:
br label %for.body
for.body: ; preds = %for.body, %entry
%i.02 = phi i64 [ 0, %entry ], [ %inc, %for.body ]
%B.addr.01 = phi i32* [ %B, %entry ], [ %incdec.ptr, %for.body ]
%conv = trunc i64 %i.02 to i32
%mul = mul i64 %i.02, 6
%arrayidx = getelementptr inbounds i32* %A, i64 %mul
store i32 %conv, i32* %arrayidx, align 4
%add = add i64 %i.02, 60
%arrayidx1 = getelementptr inbounds i32* %A, i64 %add
%0 = load i32* %arrayidx1, align 4
; CHECK: da analyze - flow [>]!
%incdec.ptr = getelementptr inbounds i32* %B.addr.01, i64 1
store i32 %0, i32* %B.addr.01, align 4
%inc = add i64 %i.02, 1
%cmp = icmp ult i64 %inc, 11
br i1 %cmp, label %for.body, label %for.end
for.end: ; preds = %for.body
ret void
}
;; for (long unsigned i = 0; i < 12; i++) {
;; A[6*i] = ...
;; ... = A[i + 60];
define void @exact4(i32* %A, i32* %B) nounwind uwtable ssp {
entry:
br label %for.body
for.body: ; preds = %for.body, %entry
%i.02 = phi i64 [ 0, %entry ], [ %inc, %for.body ]
%B.addr.01 = phi i32* [ %B, %entry ], [ %incdec.ptr, %for.body ]
%conv = trunc i64 %i.02 to i32
%mul = mul i64 %i.02, 6
%arrayidx = getelementptr inbounds i32* %A, i64 %mul
store i32 %conv, i32* %arrayidx, align 4
%add = add i64 %i.02, 60
%arrayidx1 = getelementptr inbounds i32* %A, i64 %add
%0 = load i32* %arrayidx1, align 4
; CHECK: da analyze - flow [>]!
%incdec.ptr = getelementptr inbounds i32* %B.addr.01, i64 1
store i32 %0, i32* %B.addr.01, align 4
%inc = add i64 %i.02, 1
%cmp = icmp ult i64 %inc, 12
br i1 %cmp, label %for.body, label %for.end
for.end: ; preds = %for.body
ret void
}
;; for (long unsigned i = 0; i <= 12; i++) {
;; A[6*i] = ...
;; ... = A[i + 60];
define void @exact5(i32* %A, i32* %B) nounwind uwtable ssp {
entry:
br label %for.body
for.body: ; preds = %for.body, %entry
%i.02 = phi i64 [ 0, %entry ], [ %inc, %for.body ]
%B.addr.01 = phi i32* [ %B, %entry ], [ %incdec.ptr, %for.body ]
%conv = trunc i64 %i.02 to i32
%mul = mul i64 %i.02, 6
%arrayidx = getelementptr inbounds i32* %A, i64 %mul
store i32 %conv, i32* %arrayidx, align 4
%add = add i64 %i.02, 60
%arrayidx1 = getelementptr inbounds i32* %A, i64 %add
%0 = load i32* %arrayidx1, align 4
; CHECK: da analyze - flow [=>|<]!
%incdec.ptr = getelementptr inbounds i32* %B.addr.01, i64 1
store i32 %0, i32* %B.addr.01, align 4
%inc = add i64 %i.02, 1
%cmp = icmp ult i64 %inc, 13
br i1 %cmp, label %for.body, label %for.end
for.end: ; preds = %for.body
ret void
}
;; for (long unsigned i = 0; i < 18; i++) {
;; A[6*i] = ...
;; ... = A[i + 60];
define void @exact6(i32* %A, i32* %B) nounwind uwtable ssp {
entry:
br label %for.body
for.body: ; preds = %for.body, %entry
%i.02 = phi i64 [ 0, %entry ], [ %inc, %for.body ]
%B.addr.01 = phi i32* [ %B, %entry ], [ %incdec.ptr, %for.body ]
%conv = trunc i64 %i.02 to i32
%mul = mul i64 %i.02, 6
%arrayidx = getelementptr inbounds i32* %A, i64 %mul
store i32 %conv, i32* %arrayidx, align 4
%add = add i64 %i.02, 60
%arrayidx1 = getelementptr inbounds i32* %A, i64 %add
%0 = load i32* %arrayidx1, align 4
; CHECK: da analyze - flow [=>|<]!
%incdec.ptr = getelementptr inbounds i32* %B.addr.01, i64 1
store i32 %0, i32* %B.addr.01, align 4
%inc = add i64 %i.02, 1
%cmp = icmp ult i64 %inc, 18
br i1 %cmp, label %for.body, label %for.end
for.end: ; preds = %for.body
ret void
}
;; for (long unsigned i = 0; i <= 18; i++) {
;; A[6*i] = ...
;; ... = A[i + 60];
define void @exact7(i32* %A, i32* %B) nounwind uwtable ssp {
entry:
br label %for.body
for.body: ; preds = %for.body, %entry
%i.02 = phi i64 [ 0, %entry ], [ %inc, %for.body ]
%B.addr.01 = phi i32* [ %B, %entry ], [ %incdec.ptr, %for.body ]
%conv = trunc i64 %i.02 to i32
%mul = mul i64 %i.02, 6
%arrayidx = getelementptr inbounds i32* %A, i64 %mul
store i32 %conv, i32* %arrayidx, align 4
%add = add i64 %i.02, 60
%arrayidx1 = getelementptr inbounds i32* %A, i64 %add
%0 = load i32* %arrayidx1, align 4
; CHECK: da analyze - flow [*|<]!
%incdec.ptr = getelementptr inbounds i32* %B.addr.01, i64 1
store i32 %0, i32* %B.addr.01, align 4
%inc = add i64 %i.02, 1
%cmp = icmp ult i64 %inc, 19
br i1 %cmp, label %for.body, label %for.end
for.end: ; preds = %for.body
ret void
}
;; for (long unsigned i = 0; i < 10; i++) {
;; A[-6*i] = ...
;; ... = A[-i - 60];
define void @exact8(i32* %A, i32* %B) nounwind uwtable ssp {
entry:
br label %for.body
for.body: ; preds = %for.body, %entry
%i.02 = phi i64 [ 0, %entry ], [ %inc, %for.body ]
%B.addr.01 = phi i32* [ %B, %entry ], [ %incdec.ptr, %for.body ]
%conv = trunc i64 %i.02 to i32
%mul = mul i64 %i.02, -6
%arrayidx = getelementptr inbounds i32* %A, i64 %mul
store i32 %conv, i32* %arrayidx, align 4
%sub1 = sub i64 -60, %i.02
%arrayidx2 = getelementptr inbounds i32* %A, i64 %sub1
%0 = load i32* %arrayidx2, align 4
; CHECK: da analyze - none!
%incdec.ptr = getelementptr inbounds i32* %B.addr.01, i64 1
store i32 %0, i32* %B.addr.01, align 4
%inc = add i64 %i.02, 1
%cmp = icmp ult i64 %inc, 10
br i1 %cmp, label %for.body, label %for.end
for.end: ; preds = %for.body
ret void
}
;; for (long unsigned i = 0; i <= 10; i++) {
;; A[-6*i] = ...
;; ... = A[-i - 60];
define void @exact9(i32* %A, i32* %B) nounwind uwtable ssp {
entry:
br label %for.body
for.body: ; preds = %for.body, %entry
%i.02 = phi i64 [ 0, %entry ], [ %inc, %for.body ]
%B.addr.01 = phi i32* [ %B, %entry ], [ %incdec.ptr, %for.body ]
%conv = trunc i64 %i.02 to i32
%mul = mul i64 %i.02, -6
%arrayidx = getelementptr inbounds i32* %A, i64 %mul
store i32 %conv, i32* %arrayidx, align 4
%sub1 = sub i64 -60, %i.02
%arrayidx2 = getelementptr inbounds i32* %A, i64 %sub1
%0 = load i32* %arrayidx2, align 4
; CHECK: da analyze - flow [>]!
%incdec.ptr = getelementptr inbounds i32* %B.addr.01, i64 1
store i32 %0, i32* %B.addr.01, align 4
%inc = add i64 %i.02, 1
%cmp = icmp ult i64 %inc, 11
br i1 %cmp, label %for.body, label %for.end
for.end: ; preds = %for.body
ret void
}
;; for (long unsigned i = 0; i < 12; i++) {
;; A[-6*i] = ...
;; ... = A[-i - 60];
define void @exact10(i32* %A, i32* %B) nounwind uwtable ssp {
entry:
br label %for.body
for.body: ; preds = %for.body, %entry
%i.02 = phi i64 [ 0, %entry ], [ %inc, %for.body ]
%B.addr.01 = phi i32* [ %B, %entry ], [ %incdec.ptr, %for.body ]
%conv = trunc i64 %i.02 to i32
%mul = mul i64 %i.02, -6
%arrayidx = getelementptr inbounds i32* %A, i64 %mul
store i32 %conv, i32* %arrayidx, align 4
%sub1 = sub i64 -60, %i.02
%arrayidx2 = getelementptr inbounds i32* %A, i64 %sub1
%0 = load i32* %arrayidx2, align 4
; CHECK: da analyze - flow [>]!
%incdec.ptr = getelementptr inbounds i32* %B.addr.01, i64 1
store i32 %0, i32* %B.addr.01, align 4
%inc = add i64 %i.02, 1
%cmp = icmp ult i64 %inc, 12
br i1 %cmp, label %for.body, label %for.end
for.end: ; preds = %for.body
ret void
}
;; for (long unsigned i = 0; i <= 12; i++) {
;; A[-6*i] = ...
;; ... = A[-i - 60];
define void @exact11(i32* %A, i32* %B) nounwind uwtable ssp {
entry:
br label %for.body
for.body: ; preds = %for.body, %entry
%i.02 = phi i64 [ 0, %entry ], [ %inc, %for.body ]
%B.addr.01 = phi i32* [ %B, %entry ], [ %incdec.ptr, %for.body ]
%conv = trunc i64 %i.02 to i32
%mul = mul i64 %i.02, -6
%arrayidx = getelementptr inbounds i32* %A, i64 %mul
store i32 %conv, i32* %arrayidx, align 4
%sub1 = sub i64 -60, %i.02
%arrayidx2 = getelementptr inbounds i32* %A, i64 %sub1
%0 = load i32* %arrayidx2, align 4
; CHECK: da analyze - flow [=>|<]!
%incdec.ptr = getelementptr inbounds i32* %B.addr.01, i64 1
store i32 %0, i32* %B.addr.01, align 4
%inc = add i64 %i.02, 1
%cmp = icmp ult i64 %inc, 13
br i1 %cmp, label %for.body, label %for.end
for.end: ; preds = %for.body
ret void
}
;; for (long unsigned i = 0; i < 18; i++) {
;; A[-6*i] = ...
;; ... = A[-i - 60];
define void @exact12(i32* %A, i32* %B) nounwind uwtable ssp {
entry:
br label %for.body
for.body: ; preds = %for.body, %entry
%i.02 = phi i64 [ 0, %entry ], [ %inc, %for.body ]
%B.addr.01 = phi i32* [ %B, %entry ], [ %incdec.ptr, %for.body ]
%conv = trunc i64 %i.02 to i32
%mul = mul i64 %i.02, -6
%arrayidx = getelementptr inbounds i32* %A, i64 %mul
store i32 %conv, i32* %arrayidx, align 4
%sub1 = sub i64 -60, %i.02
%arrayidx2 = getelementptr inbounds i32* %A, i64 %sub1
%0 = load i32* %arrayidx2, align 4
; CHECK: da analyze - flow [=>|<]!
%incdec.ptr = getelementptr inbounds i32* %B.addr.01, i64 1
store i32 %0, i32* %B.addr.01, align 4
%inc = add i64 %i.02, 1
%cmp = icmp ult i64 %inc, 18
br i1 %cmp, label %for.body, label %for.end
for.end: ; preds = %for.body
ret void
}
;; for (long unsigned i = 0; i <= 18; i++) {
;; A[-6*i] = ...
;; ... = A[-i - 60];
define void @exact13(i32* %A, i32* %B) nounwind uwtable ssp {
entry:
br label %for.body
for.body: ; preds = %for.body, %entry
%i.02 = phi i64 [ 0, %entry ], [ %inc, %for.body ]
%B.addr.01 = phi i32* [ %B, %entry ], [ %incdec.ptr, %for.body ]
%conv = trunc i64 %i.02 to i32
%mul = mul i64 %i.02, -6
%arrayidx = getelementptr inbounds i32* %A, i64 %mul
store i32 %conv, i32* %arrayidx, align 4
%sub1 = sub i64 -60, %i.02
%arrayidx2 = getelementptr inbounds i32* %A, i64 %sub1
%0 = load i32* %arrayidx2, align 4
; CHECK: da analyze - flow [*|<]!
%incdec.ptr = getelementptr inbounds i32* %B.addr.01, i64 1
store i32 %0, i32* %B.addr.01, align 4
%inc = add i64 %i.02, 1
%cmp = icmp ult i64 %inc, 19
br i1 %cmp, label %for.body, label %for.end
for.end: ; preds = %for.body
ret void
}