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llvm-6502/test/Analysis/DependenceAnalysis/WeakCrossingSIV.ll

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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
; RUN: opt < %s -analyze -basicaa -da | FileCheck %s
; ModuleID = 'WeakCrossingSIV.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 < n; i++)
;; A[1 + n*i] = ...
;; ... = A[1 - n*i];
define void @weakcrossing0(i32* %A, i32* %B, i64 %n) nounwind uwtable ssp {
entry:
%cmp1 = icmp eq i64 %n, 0
br i1 %cmp1, label %for.end, label %for.body
for.body: ; preds = %for.body, %entry
%i.03 = phi i64 [ %inc, %for.body ], [ 0, %entry ]
%B.addr.02 = phi i32* [ %incdec.ptr, %for.body ], [ %B, %entry ]
%conv = trunc i64 %i.03 to i32
%mul = mul i64 %i.03, %n
%add = add i64 %mul, 1
%arrayidx = getelementptr inbounds i32* %A, i64 %add
store i32 %conv, i32* %arrayidx, align 4
%mul1 = mul i64 %i.03, %n
%sub = sub i64 1, %mul1
%arrayidx2 = getelementptr inbounds i32* %A, i64 %sub
%0 = load i32* %arrayidx2, align 4
; CHECK: da analyze - flow [0|<]!
%incdec.ptr = getelementptr inbounds i32* %B.addr.02, i64 1
store i32 %0, i32* %B.addr.02, align 4
%inc = add i64 %i.03, 1
%cmp = icmp ult i64 %inc, %n
br i1 %cmp, label %for.body, label %for.end
for.end: ; preds = %for.body, %entry
ret void
}
;; for (long unsigned i = 0; i < n; i++)
;; A[n + i] = ...
;; ... = A[1 + n - i];
define void @weakcrossing1(i32* %A, i32* %B, i64 %n) nounwind uwtable ssp {
entry:
%cmp1 = icmp eq i64 %n, 0
br i1 %cmp1, label %for.end, label %for.body
for.body: ; preds = %for.body, %entry
%i.03 = phi i64 [ %inc, %for.body ], [ 0, %entry ]
%B.addr.02 = phi i32* [ %incdec.ptr, %for.body ], [ %B, %entry ]
%conv = trunc i64 %i.03 to i32
%add = add i64 %i.03, %n
%arrayidx = getelementptr inbounds i32* %A, i64 %add
store i32 %conv, i32* %arrayidx, align 4
%add1 = add i64 %n, 1
%sub = sub i64 %add1, %i.03
%arrayidx2 = getelementptr inbounds i32* %A, i64 %sub
%0 = load i32* %arrayidx2, align 4
; CHECK: da analyze - flow [<>] splitable!
; CHECK: da analyze - split level = 1, iteration = 0!
%incdec.ptr = getelementptr inbounds i32* %B.addr.02, i64 1
store i32 %0, i32* %B.addr.02, align 4
%inc = add i64 %i.03, 1
%cmp = icmp ult i64 %inc, %n
br i1 %cmp, label %for.body, label %for.end
for.end: ; preds = %for.body, %entry
ret void
}
;; for (long unsigned i = 0; i < 3; i++)
;; A[i] = ...
;; ... = A[6 - i];
define void @weakcrossing2(i32* %A, i32* %B, i64 %n) 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
%arrayidx = getelementptr inbounds i32* %A, i64 %i.02
store i32 %conv, i32* %arrayidx, align 4
%sub = sub i64 6, %i.02
%arrayidx1 = getelementptr inbounds i32* %A, i64 %sub
%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, 3
br i1 %cmp, label %for.body, label %for.end
for.end: ; preds = %for.body
ret void
}
;; for (long unsigned i = 0; i < 4; i++)
;; A[i] = ...
;; ... = A[6 - i];
define void @weakcrossing3(i32* %A, i32* %B, i64 %n) 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
%arrayidx = getelementptr inbounds i32* %A, i64 %i.02
store i32 %conv, i32* %arrayidx, align 4
%sub = sub i64 6, %i.02
%arrayidx1 = getelementptr inbounds i32* %A, i64 %sub
%0 = load i32* %arrayidx1, align 4
; CHECK: da analyze - flow [0|<]!
%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, 4
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[i] = ...
;; ... = A[-6 - i];
define void @weakcrossing4(i32* %A, i32* %B, i64 %n) 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
%arrayidx = getelementptr inbounds i32* %A, i64 %i.02
store i32 %conv, i32* %arrayidx, align 4
%sub = sub i64 -6, %i.02
%arrayidx1 = getelementptr inbounds i32* %A, i64 %sub
%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 < n; i++)
;; A[3*i] = ...
;; ... = A[5 - 3*i];
define void @weakcrossing5(i32* %A, i32* %B, i64 %n) nounwind uwtable ssp {
entry:
%cmp1 = icmp eq i64 %n, 0
br i1 %cmp1, label %for.end, label %for.body
for.body: ; preds = %for.body, %entry
%i.03 = phi i64 [ %inc, %for.body ], [ 0, %entry ]
%B.addr.02 = phi i32* [ %incdec.ptr, %for.body ], [ %B, %entry ]
%conv = trunc i64 %i.03 to i32
%mul = mul i64 %i.03, 3
%arrayidx = getelementptr inbounds i32* %A, i64 %mul
store i32 %conv, i32* %arrayidx, align 4
%0 = mul i64 %i.03, -3
%sub = add i64 %0, 5
%arrayidx2 = getelementptr inbounds i32* %A, i64 %sub
%1 = load i32* %arrayidx2, align 4
; CHECK: da analyze - none!
%incdec.ptr = getelementptr inbounds i32* %B.addr.02, i64 1
store i32 %1, i32* %B.addr.02, align 4
%inc = add i64 %i.03, 1
%cmp = icmp ult i64 %inc, %n
br i1 %cmp, label %for.body, label %for.end
for.end: ; preds = %for.body, %entry
ret void
}
;; for (long unsigned i = 0; i < 4; i++)
;; A[i] = ...
;; ... = A[5 - i];
define void @weakcrossing6(i32* %A, i32* %B, i64 %n) 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
%arrayidx = getelementptr inbounds i32* %A, i64 %i.02
store i32 %conv, i32* %arrayidx, align 4
%sub = sub i64 5, %i.02
%arrayidx1 = getelementptr inbounds i32* %A, i64 %sub
%0 = load i32* %arrayidx1, align 4
; CHECK: da analyze - flow [<>] splitable!
; CHECK: da analyze - split level = 1, iteration = 2!
%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, 4
br i1 %cmp, label %for.body, label %for.end
for.end: ; preds = %for.body
ret void
}
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