d0b9173caa
Providing the context to the ast generator allows for additional simplifcations and -- more importantly -- allows to generate loops with only partially bounded domains, assuming the domains are bounded for all parameter configurations that are valid as defined by the context. This change fixes the crash reported in http://llvm.org/PR30956 The original reason why we did not include the context when generating an AST was that CLooG and later isl used to sometimes transfer some of the constraints that bound the size of parameters from the context into the generated AST. This resulted in operations with very large constants, which sometimes introduced problematic integer overflows. The latest versions of the isl AST generator are careful to not introduce such constants. Reported-by: Eli Friedman <efriedma@codeaurora.org> llvm-svn: 286442
92 lines
3.5 KiB
LLVM
92 lines
3.5 KiB
LLVM
; RUN: opt %loadPolly -polly-import-jscop -polly-import-jscop-dir=%S \
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; RUN: -polly-codegen -S < %s | FileCheck %s
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; RUN: opt %loadPolly -polly-import-jscop -polly-import-jscop-dir=%S \
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; RUN: -polly-codegen -polly-import-jscop-postfix=pow2 \
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; RUN: -S < %s | FileCheck %s -check-prefix=POW2
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;
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; void exprModDiv(float *A, float *B, float *C, long N, long p) {
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; for (long i = 0; i < N; i++)
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; C[i] += A[i] + B[i] + A[i] + B[i + p];
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; }
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;
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;
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; This test case changes the access functions such that the resulting index
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; expressions are modulo or division operations. We test that the code we
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; generate takes advantage of knowledge about unsigned numerators. This is
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; useful as LLVM will translate urem and udiv operations with power-of-two
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; denominators to fast bitwise and or shift operations.
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; A[i % 127]
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; CHECK: %pexp.pdiv_r = urem i64 %polly.indvar, 127
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; CHECK: %polly.access.A9 = getelementptr float, float* %A, i64 %pexp.pdiv_r
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; A[floor(i / 127)]
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;
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; Note: without the floor, we would create a map i -> i/127, which only contains
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; values of i that are divisible by 127. All other values of i would not
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; be mapped to any value. However, to generate correct code we require
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; each value of i to indeed be mapped to a value.
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;
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; CHECK: %pexp.p_div_q = udiv i64 %polly.indvar, 127
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; CHECK: %polly.access.B10 = getelementptr float, float* %B, i64 %pexp.p_div_q
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; A[p % 128]
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; CHECK: %polly.access.A11 = getelementptr float, float* %A, i64 0
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; A[p / 127]
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; CHECK: %pexp.div = sdiv exact i64 %p, 127
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; CHECK: %polly.access.B12 = getelementptr float, float* %B, i64 %pexp.div
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; A[i % 128]
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; POW2: %pexp.pdiv_r = urem i64 %polly.indvar, 128
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; POW2: %polly.access.A9 = getelementptr float, float* %A, i64 %pexp.pdiv_r
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; A[floor(i / 128)]
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; POW2: %pexp.p_div_q = udiv i64 %polly.indvar, 128
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; POW2: %polly.access.B10 = getelementptr float, float* %B, i64 %pexp.p_div_q
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; A[p % 128]
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; POW2: %polly.access.A11 = getelementptr float, float* %A, i64 0
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; A[p / 128]
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; POW2: %pexp.div = sdiv exact i64 %p, 128
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; POW2: %polly.access.B12 = getelementptr float, float* %B, i64 %pexp.div
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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define void @exprModDiv(float* %A, float* %B, float* %C, i64 %N, i64 %p) {
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entry:
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br label %for.cond
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for.cond: ; preds = %for.inc, %entry
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%i.0 = phi i64 [ 0, %entry ], [ %inc, %for.inc ]
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%cmp = icmp slt i64 %i.0, %N
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br i1 %cmp, label %for.body, label %for.end
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for.body: ; preds = %for.cond
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%arrayidx = getelementptr inbounds float, float* %A, i64 %i.0
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%tmp = load float, float* %arrayidx, align 4
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%arrayidx1 = getelementptr inbounds float, float* %B, i64 %i.0
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%tmp1 = load float, float* %arrayidx1, align 4
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%add = fadd float %tmp, %tmp1
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%arrayidx2 = getelementptr inbounds float, float* %A, i64 %i.0
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%tmp2 = load float, float* %arrayidx2, align 4
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%add3 = fadd float %add, %tmp2
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%padd = add nsw i64 %p, %i.0
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%arrayidx4 = getelementptr inbounds float, float* %B, i64 %padd
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%tmp3 = load float, float* %arrayidx4, align 4
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%add5 = fadd float %add3, %tmp3
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%arrayidx6 = getelementptr inbounds float, float* %C, i64 %i.0
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%tmp4 = load float, float* %arrayidx6, align 4
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%add7 = fadd float %tmp4, %add5
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store float %add7, float* %arrayidx6, align 4
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br label %for.inc
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for.inc: ; preds = %for.body
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%inc = add nuw nsw i64 %i.0, 1
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br label %for.cond
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for.end: ; preds = %for.cond
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ret void
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}
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