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llvm-project/polly/test/GPGPU/invariant-load-of-scalar.ll

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[PPCGCodeGeneration] Skip arrays with empty extent. Invariant load hoisted scalars, and arrays whose size we can statically compute to be 0 do not need to be allocated as arrays. Invariant load hoisted scalars are sent to the kernel directly as parameters. Earlier, we used to allocate `0` bytes of memory for these because our computation of size from `PPCGCodeGeneration::getArraySize` would result in `0`. Now, since we don't invariant loads as arrays in PPCGCodeGeneration, this problem does not occur anymore. Differential Revision: https://reviews.llvm.org/D35795 llvm-svn: 308971
2017-07-25 20:35:36 +08:00
; RUN: opt %loadPolly -polly-scops -polly-invariant-load-hoisting \
; RUN: -analyze < %s | \
; RUN: FileCheck -check-prefix=SCOP %s
; RUN: opt %loadPolly -polly-codegen-ppcg -polly-invariant-load-hoisting \
; RUN: -S < %s | \
; RUN: FileCheck -check-prefix=HOST-IR %s
; RUN: opt %loadPolly -polly-codegen-ppcg -polly-invariant-load-hoisting \
; RUN: -disable-output -polly-acc-dump-kernel-ir < %s | \
; RUN: FileCheck -check-prefix=KERNEL-IR %s
; REQUIRES: pollyacc
; Check that we offload invariant loads of scalars correctly.
; Check that invariant loads are present.
; SCOP: Function: checkPrivatization
; SCOP-NEXT: Region: %entry.split---%for.end
; SCOP-NEXT: Max Loop Depth: 1
; SCOP-NEXT: Invariant Accesses: {
; SCOP-NEXT: ReadAccess := [Reduction Type: NONE] [Scalar: 0]
; SCOP-NEXT: [tmp, tmp2] -> { Stmt_entry_split[] -> MemRef_begin[0] };
; SCOP-NEXT: Execution Context: [tmp, tmp2] -> { : }
; SCOP-NEXT: ReadAccess := [Reduction Type: NONE] [Scalar: 0]
; SCOP-NEXT: [tmp, tmp2] -> { Stmt_for_body[i0] -> MemRef_end[0] };
; SCOP-NEXT: Execution Context: [tmp, tmp2] -> { : }
; SCOP-NEXT: }
;
; Check that we do not actually allocate arrays for %begin, %end, since they are
; invariant load hoisted.
[NFC] In GPGPU testcases, replace numeric registers in CHECK directives. Using numeric registers is flaky, since as soon as one additional instruction is generated by us, all the tests need to be adapted. llvm-svn: 319544
2017-12-01 22:16:39 +08:00
; HOST-IR: %p_dev_array_MemRef_A = call i8* @polly_allocateMemoryForDevice
[PPCGCodeGeneration] Skip arrays with empty extent. Invariant load hoisted scalars, and arrays whose size we can statically compute to be 0 do not need to be allocated as arrays. Invariant load hoisted scalars are sent to the kernel directly as parameters. Earlier, we used to allocate `0` bytes of memory for these because our computation of size from `PPCGCodeGeneration::getArraySize` would result in `0`. Now, since we don't invariant loads as arrays in PPCGCodeGeneration, this problem does not occur anymore. Differential Revision: https://reviews.llvm.org/D35795 llvm-svn: 308971
2017-07-25 20:35:36 +08:00
; HOST-IR-NOT: call i8* @polly_allocateMemoryForDevice
; Check that we send the invariant loaded scalars as parameters to the
; kernel function.
; KERNEL-IR: define ptx_kernel void @FUNC_checkPrivatization_SCOP_0_KERNEL_0
; KERNEL-IR-SAME: (i8 addrspace(1)* %MemRef_A, i32 %tmp,
; KERNEL-IR-SAME: i32 %tmp2, i32 %polly.access.begin.load,
; KERNEL-IR-SAME: i32 %polly.access.end.load)
; void checkScalarPointerOffload(int A[], int *begin, int *end) {
; for(int i = *begin; i < *end; i++) {
; A[i] = 10;
; }
; }
target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-apple-macosx10.12.0"
define void @checkPrivatization(i32* %A, i32* %begin, i32* %end) {
entry:
br label %entry.split
entry.split: ; preds = %entry
%tmp = load i32, i32* %begin, align 4
%tmp21 = load i32, i32* %end, align 4
%cmp3 = icmp slt i32 %tmp, %tmp21
br i1 %cmp3, label %for.body.lr.ph, label %for.end
for.body.lr.ph: ; preds = %entry.split
%tmp1 = sext i32 %tmp to i64
br label %for.body
for.body: ; preds = %for.body.lr.ph, %for.body
%indvars.iv4 = phi i64 [ %tmp1, %for.body.lr.ph ], [ %indvars.iv.next, %for.body ]
%arrayidx = getelementptr inbounds i32, i32* %A, i64 %indvars.iv4
store i32 10, i32* %arrayidx, align 4
%indvars.iv.next = add i64 %indvars.iv4, 1
%tmp2 = load i32, i32* %end, align 4
%tmp3 = sext i32 %tmp2 to i64
%cmp = icmp slt i64 %indvars.iv.next, %tmp3
br i1 %cmp, label %for.body, label %for.cond.for.end_crit_edge
for.cond.for.end_crit_edge: ; preds = %for.body
br label %for.end
for.end: ; preds = %for.cond.for.end_crit_edge, %entry.split
ret void
}