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llvm-project/polly/test/ForwardOpTree/forward_load_fromloop.ll

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[ScopBuilder] Make -polly-stmt-granularity=scalar-indep the default. Splitting basic blocks into multiple statements if there are now additional scalar dependencies gives more freedom to the scheduler, but more statements also means higher compile-time complexity. Switch to finer statement granularity, the additional compile time should be limited by the number of operations quota. The regression tests are written for the -polly-stmt-granularity=bb setting, therefore we add that flag to those tests that break with the new default. Some of the tests only fail because the statements are named differently due to a basic block resulting in multiple statements, but which are removed during simplification of statements without side-effects. Previous commits tried to reduce this effect, but it is not completely avoidable. Differential Revision: https://reviews.llvm.org/D42151 llvm-svn: 324169
2018-02-03 14:59:47 +08:00
; RUN: opt %loadPolly -polly-stmt-granularity=bb -polly-optree -analyze < %s | FileCheck %s -match-full-lines
[ForwardOpTree] Use known array content analysis to forward load instructions. This is an addition to the -polly-optree pass that reuses the array content analysis from DeLICM to find array elements that contain the same value as the value loaded when the target statement instance is executed. The analysis is now enabled by default. The known content analysis could also be used to rematerialize any llvm::Value that was written to some array element, but currently only loads are forwarded. Differential Revision: https://reviews.llvm.org/D36380 llvm-svn: 310279
2017-08-08 02:40:29 +08:00
;
[test] Add descriptions and pseudocode to tests. NFC. llvm-svn: 310385
2017-08-09 01:26:19 +08:00
; Forward a the LoadInst %val into %bodyB. %val is executed multiple times,
; we must get the last loaded values.
;
; for (int j = 0; j < n; j += 1) {
; double val;
; for (int i = 0; i < n; i += 1) {
; bodyA:
; val = B[j];
; }
;
; bodyB:
; A[j] = val;
; }
;
[ForwardOpTree] Use known array content analysis to forward load instructions. This is an addition to the -polly-optree pass that reuses the array content analysis from DeLICM to find array elements that contain the same value as the value loaded when the target statement instance is executed. The analysis is now enabled by default. The known content analysis could also be used to rematerialize any llvm::Value that was written to some array element, but currently only loads are forwarded. Differential Revision: https://reviews.llvm.org/D36380 llvm-svn: 310279
2017-08-08 02:40:29 +08:00
define void @func(i32 %n, double* noalias nonnull %A, double* noalias nonnull %B) {
entry:
br label %for
for:
%j = phi i32 [0, %entry], [%j.inc, %inc]
%j.cmp = icmp sle i32 %j, %n
br i1 %j.cmp, label %bodyA, label %exit
bodyA:
%i = phi i32 [0, %for], [%i.inc, %bodyA]
%B_idx = getelementptr inbounds double, double* %B, i32 %i
%val = load double, double* %B_idx
%i.inc = add nuw nsw i32 %i, 1
%i.cmp = icmp slt i32 %i, %n
br i1 %i.cmp, label %bodyA, label %bodyB
bodyB:
%A_idx = getelementptr inbounds double, double* %A, i32 %j
store double %val, double* %A_idx
br label %inc
inc:
%j.inc = add nuw nsw i32 %j, 1
br label %for
exit:
br label %return
return:
ret void
}
; CHECK: Statistics {
; CHECK: Known loads forwarded: 1
; CHECK: Operand trees forwarded: 1
; CHECK: Statements with forwarded operand trees: 1
; CHECK: }
; CHECK: After statements {
; CHECK-NEXT: Stmt_bodyA
; CHECK-NEXT: ReadAccess := [Reduction Type: NONE] [Scalar: 0]
; CHECK-NEXT: [n] -> { Stmt_bodyA[i0, i1] -> MemRef_B[i1] };
; CHECK-NEXT: MustWriteAccess := [Reduction Type: NONE] [Scalar: 1]
; CHECK-NEXT: [n] -> { Stmt_bodyA[i0, i1] -> MemRef_val[] };
; CHECK-NEXT: Instructions {
; CHECK-NEXT: %val = load double, double* %B_idx
; CHECK-NEXT: %i.cmp = icmp slt i32 %i, %n
; CHECK-NEXT: }
; CHECK-NEXT: Stmt_bodyB
; CHECK-NEXT: ReadAccess := [Reduction Type: NONE] [Scalar: 0]
Port ScopInfo to the isl cpp bindings Summary: Most changes are mechanical, but in one place I changed the program semantics by fixing a likely bug: In `Scop::hasFeasibleRuntimeContext()`, I'm now explicitely handling the error-case. Before, when the call to `addNonEmptyDomainConstraints()` returned a null set, this (probably) accidentally worked because isl_bool_error converts to true. I'm checking for nullptr now. Reviewers: grosser, Meinersbur, bollu Reviewed By: Meinersbur Subscribers: nemanjai, kbarton, pollydev, llvm-commits Differential Revision: https://reviews.llvm.org/D39971 llvm-svn: 318632
2017-11-20 06:13:34 +08:00
; CHECK-NEXT: ;
[ForwardOpTree] Use known array content analysis to forward load instructions. This is an addition to the -polly-optree pass that reuses the array content analysis from DeLICM to find array elements that contain the same value as the value loaded when the target statement instance is executed. The analysis is now enabled by default. The known content analysis could also be used to rematerialize any llvm::Value that was written to some array element, but currently only loads are forwarded. Differential Revision: https://reviews.llvm.org/D36380 llvm-svn: 310279
2017-08-08 02:40:29 +08:00
; CHECK-NEXT: new: [n] -> { Stmt_bodyB[i0] -> MemRef_B[n] };
; CHECK-NEXT: MustWriteAccess := [Reduction Type: NONE] [Scalar: 0]
; CHECK-NEXT: [n] -> { Stmt_bodyB[i0] -> MemRef_A[i0] };
; CHECK-NEXT: Instructions {
; CHECK-NEXT: %val = load double, double* %B_idx
; CHECK-NEXT: store double %val, double* %A_idx
; CHECK-NEXT: }
; CHECK-NEXT: }