22 lines
1.1 KiB
C
22 lines
1.1 KiB
C
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// RUN: %clang -O1 -fvectorize -target x86_64-unknown-unknown -Rpass-analysis=loop-vectorize -emit-llvm -S %s -o - 2>&1 | FileCheck %s
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// CHECK: {{.*}}:9:11: remark: loop not vectorized: cannot prove it is safe to reorder floating-point operations; allow reordering by specifying '#pragma clang loop vectorize(enable)' before the loop or by providing the compiler option '-ffast-math'.
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double foo(int N) {
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double v = 0.0;
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for (int i = 0; i < N; i++)
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v = v + 1.0;
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return v;
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}
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// CHECK: {{.*}}:17:3: remark: loop not vectorized: cannot prove it is safe to reorder memory operations; allow reordering by specifying '#pragma clang loop vectorize(enable)' before the loop. If the arrays will always be independent specify '#pragma clang loop vectorize(assume_safety)' before the loop or provide the '__restrict__' qualifier with the independent array arguments. Erroneous results will occur if these options are incorrectly applied!
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void foo2(int *dw, int *uw, int *A, int *B, int *C, int *D, int N) {
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for (long i = 0; i < N; i++) {
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dw[i] = A[i] + B[i - 1] + C[i - 2] + D[i - 3];
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uw[i] = A[i] + B[i + 1] + C[i + 2] + D[i + 3];
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}
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}
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