9120562dfc
OpenMP loop transformation did not work on a for-loop using an iterator or range-based for-loops. The first reason is that it combined the iterator's type for generated loops with the type of `NumIterations` as generated for any `OMPLoopBasedDirective` which is an integer. Fixed by basing all generated loop variables on `NumIterations`. Second, C++11 range-based for-loops include syntactic sugar that needs to be executed before the loop. This additional code is now added to the construct's Pre-Init lists. Third, C++20 added an initializer statement to range-based for-loops which is also added to the pre-init statement. PreInits used to be a `DeclStmt` which made it difficult to add arbitrary statements from `CXXRangeForStmt`'s syntactic sugar, especially the for-loops init statement which does not need to be a declaration. Change it to be a general `Stmt` that can be a `CompoundStmt` to hold arbitrary Stmts, including DeclStmts. This also avoids the `PointerUnion` workaround used by `checkTransformableLoopNest`. End-to-end tests are added to verify the expected number and order of loop execution and evaluations of expressions (such as iterator dereference). The order and number of evaluations of expressions in canonical loops is explicitly undefined by OpenMP but checked here for clarification and for changes to be noticed.
26 lines
439 B
C
26 lines
439 B
C
// RUN: %libomp-compile-and-run | FileCheck %s --match-full-lines
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#ifndef HEADER
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#define HEADER
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#include <stdlib.h>
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#include <stdio.h>
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int main() {
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printf("do\n");
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#pragma omp unroll partial
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for (int i = 7; i < 19; i += 3)
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printf("i=%d\n", i);
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printf("done\n");
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return EXIT_SUCCESS;
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}
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#endif /* HEADER */
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// CHECK: do
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// CHECK-NEXT: i=7
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// CHECK-NEXT: i=10
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// CHECK-NEXT: i=13
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// CHECK-NEXT: i=16
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// CHECK-NEXT: done
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