clang/test/OpenMP/unroll_codegen_full.cpp

   1 // Check code generation
   2 // RUN: %clang_cc1 -verify -triple x86_64-pc-linux-gnu -fopenmp -emit-llvm %s -o - | FileCheck %s --check-prefix=IR
   3
   4 // Check same results after serialization round-trip
   5 // RUN: %clang_cc1 -verify -triple x86_64-pc-linux-gnu -fopenmp -emit-pch -o %t %s
   6 // RUN: %clang_cc1 -verify -triple x86_64-pc-linux-gnu -fopenmp -include-pch %t -emit-llvm %s -o - | FileCheck %s --check-prefix=IR
   7 // expected-no-diagnostics
   8
   9 #ifndef HEADER
  10 #define HEADER
  11
  12 // placeholder for loop body code.
  13 extern "C" void body(...) {}
  14
  15
  16 // IR-LABEL: @func(
  17 // IR-NEXT:  [[ENTRY:.*]]:
  18 // IR-NEXT:    %[[I:.+]] = alloca i32, align 4
  19 // IR-NEXT:    store i32 7, ptr %[[I]], align 4
  20 // IR-NEXT:    br label %[[FOR_COND:.+]]
  21 // IR-EMPTY:
  22 // IR-NEXT:  [[FOR_COND]]:
  23 // IR-NEXT:    %[[TMP0:.+]] = load i32, ptr %[[I]], align 4
  24 // IR-NEXT:    %[[CMP:.+]] = icmp slt i32 %[[TMP0]], 17
  25 // IR-NEXT:    br i1 %[[CMP]], label %[[FOR_BODY:.+]], label %[[FOR_END:.+]]
  26 // IR-EMPTY:
  27 // IR-NEXT:  [[FOR_BODY]]:
  28 // IR-NEXT:    %[[TMP1:.+]] = load i32, ptr %[[I]], align 4
  29 // IR-NEXT:    call void (...) @body(i32 noundef %[[TMP1]])
  30 // IR-NEXT:    br label %[[FOR_INC:.+]]
  31 // IR-EMPTY:
  32 // IR-NEXT:  [[FOR_INC]]:
  33 // IR-NEXT:    %[[TMP2:.+]] = load i32, ptr %[[I]], align 4
  34 // IR-NEXT:    %[[ADD:.+]] = add nsw i32 %[[TMP2]], 3
  35 // IR-NEXT:    store i32 %[[ADD]], ptr %[[I]], align 4
  36 // IR-NEXT:    br label %[[FOR_COND]], !llvm.loop ![[LOOP2:[0-9]+]]
  37 // IR-EMPTY:
  38 // IR-NEXT:  [[FOR_END]]:
  39 // IR-NEXT:    ret void
  40 // IR-NEXT:  }
  41 extern "C" void func() {
  42   #pragma omp unroll full
  43   for (int i = 7; i < 17; i += 3)
  44     body(i);
  45 }
  46
  47 #endif /* HEADER */
  48
  49
  50 // IR: ![[LOOP2]] = distinct !{![[LOOP2]], ![[LOOPPROP3:[0-9]+]], ![[LOOPPROP4:[0-9]+]]}
  51 // IR: ![[LOOPPROP3]] = !{!"llvm.loop.mustprogress"}
  52 // IR: ![[LOOPPROP4]] = !{!"llvm.loop.unroll.full"}