[PATCH] D147588: [LV] Add a test for register pressure estimation. NFC

[Yevgeny Rouban via Phabricator via llvm-commits]

yrouban created this revision.
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The test shows that the interleave count is limited even if there is no local users other than one induction variable.

This test will be changed in the subsequent change D147434 <https://reviews.llvm.org/D147434>.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D147588

Files:
  llvm/test/Transforms/LoopVectorize/X86/interleave-count.ll


Index: llvm/test/Transforms/LoopVectorize/X86/interleave-count.ll
===================================================================
--- /dev/null
+++ llvm/test/Transforms/LoopVectorize/X86/interleave-count.ll
@@ -0,0 +1,39 @@
+; REQUIRES: asserts
+;
+; RUN: opt -S -passes=loop-vectorize -debug-only=loop-vectorize \
+; RUN:     -mtriple=x86_64-pc_linux -mcpu=cascadelake \
+; RUN:     -force-target-max-vector-interleave=16 -force-target-num-vector-regs=16 \
+; RUN:     %s 2>&1 | FileCheck %s
+
+define void @test(double *%dst, i64 %len) {
+; CHECK-LABEL: LV: Checking a loop in 'test'
+; CHECK:       LV: IC is 8
+;
+; CHECK-LABEL: define void @test
+;
+; Number of @llvm.masked.scatter() calls is 8.
+; CHECK:         call void @llvm.masked.scatter.v4f64.v4p0(<4 x double>
+; CHECK-NEXT:    call void @llvm.masked.scatter.v4f64.v4p0(<4 x double>
+; CHECK-NEXT:    call void @llvm.masked.scatter.v4f64.v4p0(<4 x double>
+; CHECK-NEXT:    call void @llvm.masked.scatter.v4f64.v4p0(<4 x double>
+; CHECK-NEXT:    call void @llvm.masked.scatter.v4f64.v4p0(<4 x double>
+; CHECK-NEXT:    call void @llvm.masked.scatter.v4f64.v4p0(<4 x double>
+; CHECK-NEXT:    call void @llvm.masked.scatter.v4f64.v4p0(<4 x double>
+; CHECK-NEXT:    call void @llvm.masked.scatter.v4f64.v4p0(<4 x double>
+; CHECK-NOT:     call void @llvm.masked.scatter.v4f64.v4p0(<4 x double>
+;
+entry:
+  %size = shl i64 %len, 3
+  %p.end = getelementptr inbounds double, ptr %dst, i64 %size
+  br label %loop
+
+loop:
+  %p = phi double * [%dst, %entry], [%p.next, %loop]
+  store double -1.000000e+00, ptr %p, align 8
+  %p.next = getelementptr inbounds double, ptr %p, i64 8
+  %done = icmp eq ptr %p.next, %p.end
+  br i1 %done, label %exit, label %loop, !prof !{!"branch_weights", i32 1, i32 1000000}
+
+exit:
+  ret void
+}


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