18f8106f31
This patch implements an LLVM IR pass, named kernel-info, that reports various statistics for codes compiled for GPUs. The ultimate goal of these statistics to help identify bad code patterns and ways to mitigate them. The pass operates at the LLVM IR level so that it can, in theory, support any LLVM-based compiler for programming languages supporting GPUs. It has been tested so far with LLVM IR generated by Clang for OpenMP offload codes targeting NVIDIA GPUs and AMD GPUs. By default, the pass runs at the end of LTO, and options like ``-Rpass=kernel-info`` enable its remarks. Example `opt` and `clang` command lines appear in `llvm/docs/KernelInfo.rst`. Remarks include summary statistics (e.g., total size of static allocas) and individual occurrences (e.g., source location of each alloca). Examples of its output appear in tests in `llvm/test/Analysis/KernelInfo`.
144 lines
12 KiB
LLVM
144 lines
12 KiB
LLVM
define void @f() !dbg !3 {
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entry:
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; load: check remarks for both unnamed and named values.
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; CHECK: remark: test.c:3:11: in function 'f', 'load' instruction ('%0') accesses memory in flat address space
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%0 = load i32, ptr null, align 4, !dbg !6
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; CHECK: remark: test.c:3:11: in function 'f', 'load' instruction ('%load') accesses memory in flat address space
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%load = load i32, ptr null, align 4, !dbg !6
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; CHECK: remark: test.c:3:11: in function 'f', 'load' instruction ('%load0') accesses memory in flat address space
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%load0 = load i32, ptr addrspace(0) null, align 4, !dbg !6
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%load1 = load i32, ptr addrspace(1) null, align 4, !dbg !6
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%load2 = load i32, ptr addrspace(2) null, align 4, !dbg !6
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; store
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; CHECK: remark: test.c:4:6: in function 'f', 'store' instruction accesses memory in flat address space
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store i32 0, ptr null, align 4, !dbg !7
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; CHECK: remark: test.c:4:6: in function 'f', 'store' instruction accesses memory in flat address space
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store i32 0, ptr addrspace(0) null, align 4, !dbg !7
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store i32 0, ptr addrspace(1) null, align 4, !dbg !7
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store i32 0, ptr addrspace(8) null, align 4, !dbg !7
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; atomicrmw
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; CHECK: remark: test.c:5:1: in function 'f', 'atomicrmw' instruction ('%[[#]]') accesses memory in flat address space
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atomicrmw xchg ptr null, i32 10 seq_cst, !dbg !8
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; CHECK: remark: test.c:5:1: in function 'f', 'atomicrmw' instruction ('%[[#]]') accesses memory in flat address space
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atomicrmw add ptr addrspace(0) null, i32 10 seq_cst, !dbg !8
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atomicrmw xchg ptr addrspace(1) null, i32 10 seq_cst, !dbg !8
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atomicrmw add ptr addrspace(37) null, i32 10 seq_cst, !dbg !8
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; cmpxchg
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; CHECK: remark: test.c:6:2: in function 'f', 'cmpxchg' instruction ('%[[#]]') accesses memory in flat address space
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cmpxchg ptr null, i32 0, i32 1 acq_rel monotonic, !dbg !9
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; CHECK: remark: test.c:6:2: in function 'f', 'cmpxchg' instruction ('%[[#]]') accesses memory in flat address space
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cmpxchg ptr addrspace(0) null, i32 0, i32 1 acq_rel monotonic, !dbg !9
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cmpxchg ptr addrspace(1) null, i32 0, i32 1 acq_rel monotonic, !dbg !9
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cmpxchg ptr addrspace(934) null, i32 0, i32 1 acq_rel monotonic, !dbg !9
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; llvm.memcpy
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; CHECK: remark: test.c:7:3: in function 'f', 'llvm.memcpy.p0.p1.i64' call accesses memory in flat address space
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call void @llvm.memcpy.p0.p1.i64(ptr align 4 null, ptr addrspace(1) align 4 null, i64 10, i1 false), !dbg !10
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; CHECK: remark: test.c:7:3: in function 'f', 'llvm.memcpy.p0.p1.i64' call accesses memory in flat address space
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call void @llvm.memcpy.p0.p1.i64(ptr addrspace(0) align 4 null, ptr addrspace(1) align 4 null, i64 10, i1 false), !dbg !10
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call void @llvm.memcpy.p1.p1.i64(ptr addrspace(1) align 4 null, ptr addrspace(1) align 4 null, i64 10, i1 false), !dbg !10
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call void @llvm.memcpy.p3.p1.i64(ptr addrspace(3) align 4 null, ptr addrspace(1) align 4 null, i64 10, i1 false), !dbg !10
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; CHECK: remark: test.c:7:3: in function 'f', 'llvm.memcpy.p1.p0.i64' call accesses memory in flat address space
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call void @llvm.memcpy.p1.p0.i64(ptr addrspace(1) align 4 null, ptr align 4 null, i64 10, i1 false), !dbg !10
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; CHECK: remark: test.c:7:3: in function 'f', 'llvm.memcpy.p1.p0.i64' call accesses memory in flat address space
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call void @llvm.memcpy.p1.p0.i64(ptr addrspace(1) align 4 null, ptr addrspace(0) align 4 null, i64 10, i1 false), !dbg !10
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call void @llvm.memcpy.p1.p1.i64(ptr addrspace(1) align 4 null, ptr addrspace(1) align 4 null, i64 10, i1 false), !dbg !10
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call void @llvm.memcpy.p1.p4.i64(ptr addrspace(1) align 4 null, ptr addrspace(4) align 4 null, i64 10, i1 false), !dbg !10
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; CHECK: remark: test.c:7:3: in function 'f', 'llvm.memcpy.p0.p0.i64' call accesses memory in flat address space
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call void @llvm.memcpy.p0.p0.i64(ptr align 4 null, ptr align 4 null, i64 10, i1 false), !dbg !10
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; CHECK: remark: test.c:7:3: in function 'f', 'llvm.memcpy.p0.p0.i64' call accesses memory in flat address space
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call void @llvm.memcpy.p0.p0.i64(ptr addrspace(0) align 4 null, ptr addrspace(0) align 4 null, i64 10, i1 false), !dbg !10
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; llvm.memcpy.inline
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; CHECK: remark: test.c:7:3: in function 'f', 'llvm.memcpy.inline.p0.p0.i64' call accesses memory in flat address space
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call void @llvm.memcpy.inline.p0.p0.i64(ptr addrspace(0) align 4 null, ptr addrspace(0) align 4 null, i64 10, i1 false), !dbg !10
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; CHECK: remark: test.c:7:3: in function 'f', 'llvm.memcpy.inline.p0.p1.i64' call accesses memory in flat address space
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call void @llvm.memcpy.inline.p0.p1.i64(ptr addrspace(0) align 4 null, ptr addrspace(1) align 4 null, i64 10, i1 false), !dbg !10
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; CHECK: remark: test.c:7:3: in function 'f', 'llvm.memcpy.inline.p1.p0.i64' call accesses memory in flat address space
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call void @llvm.memcpy.inline.p1.p0.i64(ptr addrspace(1) align 4 null, ptr addrspace(0) align 4 null, i64 10, i1 false), !dbg !10
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call void @llvm.memcpy.inline.p1.p1.i64(ptr addrspace(1) align 4 null, ptr addrspace(1) align 4 null, i64 10, i1 false), !dbg !10
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; llvm.memcpy.element.unordered.atomic
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; CHECK: remark: test.c:7:3: in function 'f', 'llvm.memcpy.element.unordered.atomic.p0.p0.i64' call accesses memory in flat address space
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call void @llvm.memcpy.element.unordered.atomic.p0.p0.i64(ptr addrspace(0) align 4 null, ptr addrspace(0) align 4 null, i64 10, i32 4), !dbg !10
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; CHECK: remark: test.c:7:3: in function 'f', 'llvm.memcpy.element.unordered.atomic.p0.p1.i64' call accesses memory in flat address space
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call void @llvm.memcpy.element.unordered.atomic.p0.p1.i64(ptr addrspace(0) align 4 null, ptr addrspace(1) align 4 null, i64 10, i32 4), !dbg !10
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; CHECK: remark: test.c:7:3: in function 'f', 'llvm.memcpy.element.unordered.atomic.p1.p0.i64' call accesses memory in flat address space
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call void @llvm.memcpy.element.unordered.atomic.p1.p0.i64(ptr addrspace(1) align 4 null, ptr addrspace(0) align 4 null, i64 10, i32 4), !dbg !10
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call void @llvm.memcpy.element.unordered.atomic.p1.p1.i64(ptr addrspace(1) align 4 null, ptr addrspace(1) align 4 null, i64 10, i32 4), !dbg !10
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; llvm.memmove
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; CHECK: remark: test.c:8:4: in function 'f', 'llvm.memmove.p0.p1.i64' call accesses memory in flat address space
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call void @llvm.memmove.p0.p1.i64(ptr align 4 null, ptr addrspace(1) align 4 null, i64 10, i1 false), !dbg !11
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; CHECK: remark: test.c:8:4: in function 'f', 'llvm.memmove.p0.p1.i64' call accesses memory in flat address space
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call void @llvm.memmove.p0.p1.i64(ptr addrspace(0) align 4 null, ptr addrspace(1) align 4 null, i64 10, i1 false), !dbg !11
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call void @llvm.memmove.p1.p1.i64(ptr addrspace(1) align 4 null, ptr addrspace(1) align 4 null, i64 10, i1 false), !dbg !11
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call void @llvm.memmove.p3.p1.i64(ptr addrspace(3) align 4 null, ptr addrspace(1) align 4 null, i64 10, i1 false), !dbg !11
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; CHECK: remark: test.c:8:4: in function 'f', 'llvm.memmove.p1.p0.i64' call accesses memory in flat address space
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call void @llvm.memmove.p1.p0.i64(ptr addrspace(1) align 4 null, ptr align 4 null, i64 10, i1 false), !dbg !11
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; CHECK: remark: test.c:8:4: in function 'f', 'llvm.memmove.p1.p0.i64' call accesses memory in flat address space
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call void @llvm.memmove.p1.p0.i64(ptr addrspace(1) align 4 null, ptr addrspace(0) align 4 null, i64 10, i1 false), !dbg !11
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call void @llvm.memmove.p1.p1.i64(ptr addrspace(1) align 4 null, ptr addrspace(1) align 4 null, i64 10, i1 false), !dbg !11
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call void @llvm.memmove.p1.p4.i64(ptr addrspace(1) align 4 null, ptr addrspace(4) align 4 null, i64 10, i1 false), !dbg !11
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; CHECK: remark: test.c:8:4: in function 'f', 'llvm.memmove.p0.p0.i64' call accesses memory in flat address space
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call void @llvm.memmove.p0.p0.i64(ptr align 4 null, ptr align 4 null, i64 10, i1 false), !dbg !11
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; CHECK: remark: test.c:8:4: in function 'f', 'llvm.memmove.p0.p0.i64' call accesses memory in flat address space
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call void @llvm.memmove.p0.p0.i64(ptr addrspace(0) align 4 null, ptr addrspace(0) align 4 null, i64 10, i1 false), !dbg !11
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; llvm.memmove.element.unordered.atomic
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; CHECK: remark: test.c:8:4: in function 'f', 'llvm.memmove.element.unordered.atomic.p0.p0.i64' call accesses memory in flat address space
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call void @llvm.memmove.element.unordered.atomic.p0.p0.i64(ptr addrspace(0) align 4 null, ptr addrspace(0) align 4 null, i64 10, i32 4), !dbg !11
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; CHECK: remark: test.c:8:4: in function 'f', 'llvm.memmove.element.unordered.atomic.p0.p1.i64' call accesses memory in flat address space
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call void @llvm.memmove.element.unordered.atomic.p0.p1.i64(ptr addrspace(0) align 4 null, ptr addrspace(1) align 4 null, i64 10, i32 4), !dbg !11
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; CHECK: remark: test.c:8:4: in function 'f', 'llvm.memmove.element.unordered.atomic.p1.p0.i64' call accesses memory in flat address space
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call void @llvm.memmove.element.unordered.atomic.p1.p0.i64(ptr addrspace(1) align 4 null, ptr addrspace(0) align 4 null, i64 10, i32 4), !dbg !11
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call void @llvm.memmove.element.unordered.atomic.p1.p1.i64(ptr addrspace(1) align 4 null, ptr addrspace(1) align 4 null, i64 10, i32 4), !dbg !11
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; llvm.memset
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; CHECK: remark: test.c:9:5: in function 'f', 'llvm.memset.p0.i64' call accesses memory in flat address space
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call void @llvm.memset.p0.i64(ptr align 4 null, i8 0, i64 10, i1 false), !dbg !12
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; CHECK: remark: test.c:9:5: in function 'f', 'llvm.memset.p0.i64' call accesses memory in flat address space
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call void @llvm.memset.p0.i64(ptr addrspace(0) align 4 null, i8 0, i64 10, i1 false), !dbg !12
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call void @llvm.memset.p1.i64(ptr addrspace(1) align 4 null, i8 0, i64 10, i1 false), !dbg !12
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call void @llvm.memset.p3.i64(ptr addrspace(3) align 4 null, i8 0, i64 10, i1 false), !dbg !12
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; llvm.memset.inline
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; CHECK: remark: test.c:9:5: in function 'f', 'llvm.memset.inline.p0.i64' call accesses memory in flat address space
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call void @llvm.memset.inline.p0.i64(ptr align 4 null, i8 0, i64 10, i1 false), !dbg !12
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; CHECK: remark: test.c:9:5: in function 'f', 'llvm.memset.inline.p0.i64' call accesses memory in flat address space
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call void @llvm.memset.inline.p0.i64(ptr addrspace(0) align 4 null, i8 0, i64 10, i1 false), !dbg !12
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call void @llvm.memset.inline.p1.i64(ptr addrspace(1) align 4 null, i8 0, i64 10, i1 false), !dbg !12
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call void @llvm.memset.inline.p3.i64(ptr addrspace(3) align 4 null, i8 0, i64 10, i1 false), !dbg !12
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; llvm.memset.element.unordered.atomic
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; CHECK: remark: test.c:9:5: in function 'f', 'llvm.memset.element.unordered.atomic.p0.i64' call accesses memory in flat address space
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call void @llvm.memset.element.unordered.atomic.p0.i64(ptr align 4 null, i8 0, i64 10, i32 4), !dbg !12
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; CHECK: remark: test.c:9:5: in function 'f', 'llvm.memset.element.unordered.atomic.p0.i64' call accesses memory in flat address space
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call void @llvm.memset.element.unordered.atomic.p0.i64(ptr addrspace(0) align 4 null, i8 0, i64 10, i32 4), !dbg !12
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call void @llvm.memset.element.unordered.atomic.p1.i64(ptr addrspace(1) align 4 null, i8 0, i64 10, i32 4), !dbg !12
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call void @llvm.memset.element.unordered.atomic.p3.i64(ptr addrspace(3) align 4 null, i8 0, i64 10, i32 4), !dbg !12
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ret void
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}
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; CHECK: remark: test.c:2:0: in function 'f', FlatAddrspaceAccesses = 36
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!2}
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!0 = distinct !DICompileUnit(language: DW_LANG_C11, file: !1, producer: "clang version 19.0.0git", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, splitDebugInlining: false, nameTableKind: None)
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!1 = !DIFile(filename: "test.c", directory: "/tmp")
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!2 = !{i32 2, !"Debug Info Version", i32 3}
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!3 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 2, type: !4, scopeLine: 2, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !5)
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!4 = !DISubroutineType(types: !5)
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!5 = !{}
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!6 = !DILocation(line: 3, column: 11, scope: !3)
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!7 = !DILocation(line: 4, column: 6, scope: !3)
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!8 = !DILocation(line: 5, column: 1, scope: !3)
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!9 = !DILocation(line: 6, column: 2, scope: !3)
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!10 = !DILocation(line: 7, column: 3, scope: !3)
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!11 = !DILocation(line: 8, column: 4, scope: !3)
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!12 = !DILocation(line: 9, column: 5, scope: !3)
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