diff options
Diffstat (limited to 'test/Transforms/LoopVectorize/pr31098.ll')
| -rw-r--r-- | test/Transforms/LoopVectorize/pr31098.ll | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/test/Transforms/LoopVectorize/pr31098.ll b/test/Transforms/LoopVectorize/pr31098.ll new file mode 100644 index 000000000000..368a948557c3 --- /dev/null +++ b/test/Transforms/LoopVectorize/pr31098.ll @@ -0,0 +1,100 @@ +; REQUIRES: asserts +; RUN: opt -S -loop-vectorize -force-vector-width=4 -force-vector-interleave=1 -enable-interleaved-mem-accesses=true -debug-only=loop-accesses < %s 2>&1 | FileCheck %s + +target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128" + +; Check that the compile-time-unknown depenendece-distance is resolved +; statically. Due to the non-unit stride of the accesses in this testcase +; we are currently not able to create runtime dependence checks, and therefore +; if we don't resolve the dependence statically we cannot vectorize the loop. +; +; Specifically in this example, during dependence analysis we get 6 unknown +; dependence distances between the 8 real/imaginary accesses below: +; dist = 8*D, 4+8*D, -4+8*D, -8*D, 4-8*D, -4-8*D. +; At compile time we can prove for all of the above that |dist|>loopBound*step +; (where the step is 8bytes, and the loopBound is D-1), and thereby conclude +; that there are no dependencies (without runtime tests): +; |8*D|>8*D-8, |4+8*D|>8*D-8, |-4+8*D|>8*D-8, etc. + +; #include <stdlib.h> +; class Complex { +; private: +; float real_; +; float imaginary_; +; +; public: +; Complex() : real_(0), imaginary_(0) { } +; Complex(float real, float imaginary) : real_(real), imaginary_(imaginary) { } +; Complex(const Complex &rhs) : real_(rhs.real()), imaginary_(rhs.imaginary()) { } +; +; inline float real() const { return real_; } +; inline float imaginary() const { return imaginary_; } +; +; Complex operator+(const Complex& rhs) const +; { +; return Complex(real_ + rhs.real_, imaginary_ + rhs.imaginary_); +; } +; +; Complex operator-(const Complex& rhs) const +; { +; return Complex(real_ - rhs.real_, imaginary_ - rhs.imaginary_); +; } +; }; +; +; void Test(Complex *out, size_t size) +; { +; size_t D = size / 2; +; for (size_t offset = 0; offset < D; ++offset) +; { +; Complex t0 = out[offset]; +; Complex t1 = out[offset + D]; +; out[offset] = t1 + t0; +; out[offset + D] = t0 - t1; +; } +; } + +; CHECK-LABEL: Test +; CHECK: LAA: No unsafe dependent memory operations in loop. We don't need runtime memory checks. +; CHECK: vector.body: +; CHECK: <4 x i32> + +%class.Complex = type { float, float } + +define void @Test(%class.Complex* nocapture %out, i64 %size) local_unnamed_addr { +entry: + %div = lshr i64 %size, 1 + %cmp47 = icmp eq i64 %div, 0 + br i1 %cmp47, label %for.cond.cleanup, label %for.body.preheader + +for.body.preheader: + br label %for.body + +for.cond.cleanup.loopexit: + br label %for.cond.cleanup + +for.cond.cleanup: + ret void + +for.body: + %offset.048 = phi i64 [ %inc, %for.body ], [ 0, %for.body.preheader ] + %0 = getelementptr inbounds %class.Complex, %class.Complex* %out, i64 %offset.048, i32 0 + %1 = load float, float* %0, align 4 + %imaginary_.i.i = getelementptr inbounds %class.Complex, %class.Complex* %out, i64 %offset.048, i32 1 + %2 = load float, float* %imaginary_.i.i, align 4 + %add = add nuw i64 %offset.048, %div + %3 = getelementptr inbounds %class.Complex, %class.Complex* %out, i64 %add, i32 0 + %4 = load float, float* %3, align 4 + %imaginary_.i.i28 = getelementptr inbounds %class.Complex, %class.Complex* %out, i64 %add, i32 1 + %5 = load float, float* %imaginary_.i.i28, align 4 + %add.i = fadd fast float %4, %1 + %add4.i = fadd fast float %5, %2 + store float %add.i, float* %0, align 4 + store float %add4.i, float* %imaginary_.i.i, align 4 + %sub.i = fsub fast float %1, %4 + %sub4.i = fsub fast float %2, %5 + store float %sub.i, float* %3, align 4 + store float %sub4.i, float* %imaginary_.i.i28, align 4 + %inc = add nuw nsw i64 %offset.048, 1 + %exitcond = icmp eq i64 %inc, %div + br i1 %exitcond, label %for.cond.cleanup.loopexit, label %for.body +} |