mirror of
https://github.com/c64scene-ar/llvm-6502.git
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ad43499fc4
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
221 lines
7.4 KiB
LLVM
221 lines
7.4 KiB
LLVM
; RUN: opt < %s -analyze -basicaa -da | FileCheck %s
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; ModuleID = 'WeakCrossingSIV.bc'
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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"
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target triple = "x86_64-apple-macosx10.6.0"
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;; for (long unsigned i = 0; i < n; i++)
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;; A[1 + n*i] = ...
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;; ... = A[1 - n*i];
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define void @weakcrossing0(i32* %A, i32* %B, i64 %n) nounwind uwtable ssp {
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entry:
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%cmp1 = icmp eq i64 %n, 0
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br i1 %cmp1, label %for.end, label %for.body
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for.body: ; preds = %for.body, %entry
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%i.03 = phi i64 [ %inc, %for.body ], [ 0, %entry ]
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%B.addr.02 = phi i32* [ %incdec.ptr, %for.body ], [ %B, %entry ]
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%conv = trunc i64 %i.03 to i32
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%mul = mul i64 %i.03, %n
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%add = add i64 %mul, 1
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%arrayidx = getelementptr inbounds i32* %A, i64 %add
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store i32 %conv, i32* %arrayidx, align 4
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%mul1 = mul i64 %i.03, %n
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%sub = sub i64 1, %mul1
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%arrayidx2 = getelementptr inbounds i32* %A, i64 %sub
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%0 = load i32* %arrayidx2, align 4
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; CHECK: da analyze - flow [0|<]!
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%incdec.ptr = getelementptr inbounds i32* %B.addr.02, i64 1
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store i32 %0, i32* %B.addr.02, align 4
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%inc = add i64 %i.03, 1
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%cmp = icmp ult i64 %inc, %n
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br i1 %cmp, label %for.body, label %for.end
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for.end: ; preds = %for.body, %entry
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ret void
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}
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;; for (long unsigned i = 0; i < n; i++)
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;; A[n + i] = ...
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;; ... = A[1 + n - i];
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define void @weakcrossing1(i32* %A, i32* %B, i64 %n) nounwind uwtable ssp {
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entry:
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%cmp1 = icmp eq i64 %n, 0
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br i1 %cmp1, label %for.end, label %for.body
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for.body: ; preds = %for.body, %entry
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%i.03 = phi i64 [ %inc, %for.body ], [ 0, %entry ]
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%B.addr.02 = phi i32* [ %incdec.ptr, %for.body ], [ %B, %entry ]
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%conv = trunc i64 %i.03 to i32
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%add = add i64 %i.03, %n
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%arrayidx = getelementptr inbounds i32* %A, i64 %add
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store i32 %conv, i32* %arrayidx, align 4
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%add1 = add i64 %n, 1
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%sub = sub i64 %add1, %i.03
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%arrayidx2 = getelementptr inbounds i32* %A, i64 %sub
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%0 = load i32* %arrayidx2, align 4
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; CHECK: da analyze - flow [<>] splitable!
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; CHECK: da analyze - split level = 1, iteration = 0!
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%incdec.ptr = getelementptr inbounds i32* %B.addr.02, i64 1
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store i32 %0, i32* %B.addr.02, align 4
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%inc = add i64 %i.03, 1
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%cmp = icmp ult i64 %inc, %n
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br i1 %cmp, label %for.body, label %for.end
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for.end: ; preds = %for.body, %entry
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ret void
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}
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;; for (long unsigned i = 0; i < 3; i++)
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;; A[i] = ...
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;; ... = A[6 - i];
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define void @weakcrossing2(i32* %A, i32* %B, i64 %n) nounwind uwtable ssp {
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entry:
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br label %for.body
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for.body: ; preds = %for.body, %entry
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%i.02 = phi i64 [ 0, %entry ], [ %inc, %for.body ]
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%B.addr.01 = phi i32* [ %B, %entry ], [ %incdec.ptr, %for.body ]
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%conv = trunc i64 %i.02 to i32
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%arrayidx = getelementptr inbounds i32* %A, i64 %i.02
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store i32 %conv, i32* %arrayidx, align 4
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%sub = sub i64 6, %i.02
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%arrayidx1 = getelementptr inbounds i32* %A, i64 %sub
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%0 = load i32* %arrayidx1, align 4
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; CHECK: da analyze - none!
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%incdec.ptr = getelementptr inbounds i32* %B.addr.01, i64 1
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store i32 %0, i32* %B.addr.01, align 4
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%inc = add i64 %i.02, 1
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%cmp = icmp ult i64 %inc, 3
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br i1 %cmp, label %for.body, label %for.end
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for.end: ; preds = %for.body
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ret void
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}
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;; for (long unsigned i = 0; i < 4; i++)
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;; A[i] = ...
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;; ... = A[6 - i];
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define void @weakcrossing3(i32* %A, i32* %B, i64 %n) nounwind uwtable ssp {
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entry:
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br label %for.body
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for.body: ; preds = %for.body, %entry
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%i.02 = phi i64 [ 0, %entry ], [ %inc, %for.body ]
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%B.addr.01 = phi i32* [ %B, %entry ], [ %incdec.ptr, %for.body ]
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%conv = trunc i64 %i.02 to i32
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%arrayidx = getelementptr inbounds i32* %A, i64 %i.02
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store i32 %conv, i32* %arrayidx, align 4
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%sub = sub i64 6, %i.02
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%arrayidx1 = getelementptr inbounds i32* %A, i64 %sub
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%0 = load i32* %arrayidx1, align 4
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; CHECK: da analyze - flow [0|<]!
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%incdec.ptr = getelementptr inbounds i32* %B.addr.01, i64 1
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store i32 %0, i32* %B.addr.01, align 4
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%inc = add i64 %i.02, 1
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%cmp = icmp ult i64 %inc, 4
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br i1 %cmp, label %for.body, label %for.end
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for.end: ; preds = %for.body
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ret void
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}
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;; for (long unsigned i = 0; i < 10; i++)
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;; A[i] = ...
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;; ... = A[-6 - i];
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define void @weakcrossing4(i32* %A, i32* %B, i64 %n) nounwind uwtable ssp {
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entry:
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br label %for.body
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for.body: ; preds = %for.body, %entry
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%i.02 = phi i64 [ 0, %entry ], [ %inc, %for.body ]
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%B.addr.01 = phi i32* [ %B, %entry ], [ %incdec.ptr, %for.body ]
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%conv = trunc i64 %i.02 to i32
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%arrayidx = getelementptr inbounds i32* %A, i64 %i.02
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store i32 %conv, i32* %arrayidx, align 4
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%sub = sub i64 -6, %i.02
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%arrayidx1 = getelementptr inbounds i32* %A, i64 %sub
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%0 = load i32* %arrayidx1, align 4
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; CHECK: da analyze - none!
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%incdec.ptr = getelementptr inbounds i32* %B.addr.01, i64 1
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store i32 %0, i32* %B.addr.01, align 4
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%inc = add i64 %i.02, 1
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%cmp = icmp ult i64 %inc, 10
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br i1 %cmp, label %for.body, label %for.end
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for.end: ; preds = %for.body
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ret void
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}
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;; for (long unsigned i = 0; i < n; i++)
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;; A[3*i] = ...
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;; ... = A[5 - 3*i];
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define void @weakcrossing5(i32* %A, i32* %B, i64 %n) nounwind uwtable ssp {
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entry:
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%cmp1 = icmp eq i64 %n, 0
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br i1 %cmp1, label %for.end, label %for.body
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for.body: ; preds = %for.body, %entry
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%i.03 = phi i64 [ %inc, %for.body ], [ 0, %entry ]
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%B.addr.02 = phi i32* [ %incdec.ptr, %for.body ], [ %B, %entry ]
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%conv = trunc i64 %i.03 to i32
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%mul = mul i64 %i.03, 3
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%arrayidx = getelementptr inbounds i32* %A, i64 %mul
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store i32 %conv, i32* %arrayidx, align 4
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%0 = mul i64 %i.03, -3
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%sub = add i64 %0, 5
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%arrayidx2 = getelementptr inbounds i32* %A, i64 %sub
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%1 = load i32* %arrayidx2, align 4
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; CHECK: da analyze - none!
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%incdec.ptr = getelementptr inbounds i32* %B.addr.02, i64 1
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store i32 %1, i32* %B.addr.02, align 4
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%inc = add i64 %i.03, 1
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%cmp = icmp ult i64 %inc, %n
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br i1 %cmp, label %for.body, label %for.end
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for.end: ; preds = %for.body, %entry
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ret void
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}
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;; for (long unsigned i = 0; i < 4; i++)
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;; A[i] = ...
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;; ... = A[5 - i];
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define void @weakcrossing6(i32* %A, i32* %B, i64 %n) nounwind uwtable ssp {
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entry:
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br label %for.body
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for.body: ; preds = %for.body, %entry
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%i.02 = phi i64 [ 0, %entry ], [ %inc, %for.body ]
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%B.addr.01 = phi i32* [ %B, %entry ], [ %incdec.ptr, %for.body ]
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%conv = trunc i64 %i.02 to i32
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%arrayidx = getelementptr inbounds i32* %A, i64 %i.02
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store i32 %conv, i32* %arrayidx, align 4
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%sub = sub i64 5, %i.02
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%arrayidx1 = getelementptr inbounds i32* %A, i64 %sub
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%0 = load i32* %arrayidx1, align 4
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; CHECK: da analyze - flow [<>] splitable!
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; CHECK: da analyze - split level = 1, iteration = 2!
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%incdec.ptr = getelementptr inbounds i32* %B.addr.01, i64 1
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store i32 %0, i32* %B.addr.01, align 4
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%inc = add i64 %i.02, 1
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%cmp = icmp ult i64 %inc, 4
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br i1 %cmp, label %for.body, label %for.end
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for.end: ; preds = %for.body
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ret void
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}
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