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This does not only remove the need for an explicit loop rotate pass, but it also
gives us the possibility to skip the construction of the guard condition in case
the loop is known to be executed at least once. We do not yet exploit this, but
by implementing this analysis in the isl code generator we should be able to
remove more guards than the generic loop rotate pass can. Another point is that
loop rotation can introduce additional PHI nodes, which may hide that a loop can
be executed in parallel. This change avoids this complication and will make it
easier to move the openmp code generation into a separate pass.
llvm-svn: 181986
89 lines
2.7 KiB
LLVM
89 lines
2.7 KiB
LLVM
; RUN: opt %loadPolly %defaultOpts -polly-codegen -enable-polly-openmp -verify-dom-info -S < %s | FileCheck %s
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;#include <string.h>
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;#define N 10
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;
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;double A[N];
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;double B[N];
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;
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;void loop_openmp() {
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; for (int i = 0; i < N; i++) {
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; for (int j = 0; j < N; j++) {
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; A[j] += j;
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; }
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; }
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;}
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;
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;int main () {
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; memset(A, 0, sizeof(float) * N);
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;
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; loop_openmp();
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;
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; return 0;
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;}
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;
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target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:32:32-n8:16:32"
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target triple = "i386-pc-linux-gnu"
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@A = common global [10 x double] zeroinitializer, align 4
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@B = common global [10 x double] zeroinitializer, align 4
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define void @loop_openmp() nounwind {
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entry:
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br label %for.cond
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for.cond: ; preds = %for.inc10, %entry
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%i.0 = phi i32 [ 0, %entry ], [ %inc12, %for.inc10 ]
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%exitcond1 = icmp ne i32 %i.0, 10
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br i1 %exitcond1, label %for.body, label %for.end13
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for.body: ; preds = %for.cond
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br label %for.cond2
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for.cond2: ; preds = %for.inc, %for.body
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%tmp = phi i32 [ 0, %for.body ], [ %inc, %for.inc ]
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%arrayidx = getelementptr [10 x double]* @A, i32 0, i32 %tmp
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%exitcond = icmp ne i32 %tmp, 10
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br i1 %exitcond, label %for.body5, label %for.end
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for.body5: ; preds = %for.cond2
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%conv = sitofp i32 %tmp to double
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%tmp8 = load double* %arrayidx, align 4
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%add = fadd double %tmp8, %conv
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store double %add, double* %arrayidx, align 4
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br label %for.inc
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for.inc: ; preds = %for.body5
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%inc = add nsw i32 %tmp, 1
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br label %for.cond2
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for.end: ; preds = %for.cond2
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br label %for.inc10
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for.inc10: ; preds = %for.end
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%inc12 = add nsw i32 %i.0, 1
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br label %for.cond
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for.end13: ; preds = %for.cond
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ret void
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}
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define i32 @main() nounwind {
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entry:
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call void @llvm.memset.p0i8.i32(i8* bitcast ([10 x double]* @A to i8*), i8 0, i32 40, i32 4, i1 false)
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call void @loop_openmp()
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ret i32 0
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}
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declare void @llvm.memset.p0i8.i32(i8* nocapture, i8, i32, i32, i1) nounwind
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; CHECK: %omp.userContext = alloca { i32 }
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; CHECK: getelementptr inbounds { i32 }* %omp.userContext, i32 0, i32 0
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; CHECK: store i32 %polly.indvar, i32* %0
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; CHECK: %omp_data = bitcast { i32 }* %omp.userContext to i8*
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; CHECK: call void @GOMP_parallel_loop_runtime_start(void (i8*)* @loop_openmp.omp_subfn, i8* %omp_data, i32 0, i32 0, i32 10, i32 1)
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; CHECK: call void @loop_openmp.omp_subfn(i8* %omp_data)
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; CHECK: call void @GOMP_parallel_end()
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