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https://github.com/c64scene-ar/llvm-6502.git
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333d5c9f51
stored rather than the pointer type. This change is analogous to r220138 which changed the canonicalization for loads. The rationale is the same: memory does not have a type, operations (and thus the values they produce) have a type. We should match that type as closely as possible rather than reading some form of semantics into the pointer type. With this change, loads and stores should no longer be made with nonsensical types for the values that tehy load and store. This is particularly important when trying to match specific loaded and stored types in the process of doing other instcombines, which is what led me down this twisty maze of miscanonicalization. I've put quite some effort into looking through IR to find places where LLVM's optimizer was being unreasonably conservative in the face of mismatched load and store types, however it is possible (let's say, likely!) I have missed some. If you see regressions here, or from r220138, the likely cause is some part of LLVM failing to cope with load and store types differing. Test cases appreciated, it is important that we root all of these out of LLVM. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@222748 91177308-0d34-0410-b5e6-96231b3b80d8
240 lines
8.4 KiB
LLVM
240 lines
8.4 KiB
LLVM
; RUN: opt -S -instcombine -o - %s | FileCheck %s
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target datalayout = "e-p:32:32:32-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v16:16:16-v24:32:32-v32:32:32-v64:64:64-v128:128:128-a0:0:64"
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; Cases that should be bitcast
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; Test cast between scalars with same bit sizes
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@alias_i32_to_f32 = alias bitcast (i32 (i32)* @func_i32 to float (float)*)
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; Test cast between vectors with same number of elements and bit sizes
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@alias_v2i32_to_v2f32 = alias bitcast (<2 x i32> (<2 x i32>)* @func_v2i32 to <2 x float> (<2 x float>)*)
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; Test cast from vector to scalar with same number of bits
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@alias_v2f32_to_i64 = alias bitcast (i64 (i64)* @func_i64 to <2 x float> (<2 x float>)*)
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; Test cast from scalar to vector with same number of bits
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@alias_i64_to_v2f32 = alias bitcast (<2 x float> (<2 x float>)* @func_v2f32 to i64 (i64)*)
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; Test cast between vectors of pointers
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@alias_v2i32p_to_v2i64p = alias bitcast (<2 x i32*> (<2 x i32*>)* @func_v2i32p to <2 x i64*> (<2 x i64*>)*)
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; Cases that should be invalid and unchanged
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; Test cast between scalars with different bit sizes
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@alias_i64_to_f32 = alias bitcast (i64 (i64)* @func_i64 to float (float)*)
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; Test cast between vectors with different bit sizes but the
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; same number of elements
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@alias_v2i64_to_v2f32 = alias bitcast (<2 x i64> (<2 x i64>)* @func_v2i64 to <2 x float> (<2 x float>)*)
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; Test cast between vectors with same number of bits and different
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; numbers of elements
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@alias_v2i32_to_v4f32 = alias bitcast (<2 x i32> (<2 x i32>)* @func_v2i32 to <4 x float> (<4 x float>)*)
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; Test cast between scalar and vector with different number of bits
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@alias_i64_to_v4f32 = alias bitcast (<4 x float> (<4 x float>)* @func_v4f32 to i64 (i64)*)
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; Test cast between vector and scalar with different number of bits
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@alias_v4f32_to_i64 = alias bitcast (i64 (i64)* @func_i64 to <4 x float> (<4 x float>)*)
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; Test cast from scalar to vector of pointers with same number of bits
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; We don't know the pointer size at this point, so this can't be done
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@alias_i64_to_v2i32p = alias bitcast (<2 x i32*> (<2 x i32*>)* @func_v2i32p to i64 (i64)*)
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; Test cast between vector of pointers and scalar with different number of bits
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@alias_v4i32p_to_i64 = alias bitcast (i64 (i64)* @func_i64 to <4 x i32*> (<4 x i32*>)*)
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define internal <2 x i32> @func_v2i32(<2 x i32> %v) noinline nounwind {
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entry:
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ret <2 x i32> %v
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}
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define internal <2 x float> @func_v2f32(<2 x float> %v) noinline nounwind {
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entry:
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ret <2 x float> %v
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}
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define internal <4 x float> @func_v4f32(<4 x float> %v) noinline nounwind {
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entry:
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ret <4 x float> %v
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}
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define internal i32 @func_i32(i32 %v) noinline nounwind {
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entry:
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ret i32 %v
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}
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define internal i64 @func_i64(i64 %v) noinline nounwind {
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entry:
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ret i64 %v
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}
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define internal <2 x i64> @func_v2i64(<2 x i64> %v) noinline nounwind {
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entry:
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ret <2 x i64> %v
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}
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define internal <2 x i32*> @func_v2i32p(<2 x i32*> %v) noinline nounwind {
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entry:
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ret <2 x i32*> %v
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}
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; Valid cases, only bitcast for argument / return type and call underlying function
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; Sizes match, should only bitcast
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define void @bitcast_alias_scalar(float* noalias %source, float* noalias %dest) nounwind {
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entry:
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; CHECK-LABEL: @bitcast_alias_scalar
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; CHECK: bitcast float* %source to i32*
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; CHECK: load i32*
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; CHECK-NOT: fptoui
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; CHECK-NOT: uitofp
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; CHECK: bitcast float* %dest to i32*
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; CHECK: store i32
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%tmp = load float* %source, align 8
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%call = call float @alias_i32_to_f32(float %tmp) nounwind
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store float %call, float* %dest, align 8
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ret void
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}
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; Sizes match, should only bitcast
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define void @bitcast_alias_vector(<2 x float>* noalias %source, <2 x float>* noalias %dest) nounwind {
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entry:
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; CHECK-LABEL: @bitcast_alias_vector
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; CHECK: bitcast <2 x float>* %source to <2 x i32>*
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; CHECK: load <2 x i32>*
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; CHECK-NOT: fptoui
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; CHECK-NOT: uitofp
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; CHECK: bitcast <2 x float>* %dest to <2 x i32>*
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; CHECK: store <2 x i32>
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%tmp = load <2 x float>* %source, align 8
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%call = call <2 x float> @alias_v2i32_to_v2f32(<2 x float> %tmp) nounwind
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store <2 x float> %call, <2 x float>* %dest, align 8
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ret void
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}
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; Sizes match, should only bitcast
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define void @bitcast_alias_vector_scalar_same_size(<2 x float>* noalias %source, <2 x float>* noalias %dest) nounwind {
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entry:
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; CHECK-LABEL: @bitcast_alias_vector_scalar_same_size
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; CHECK: bitcast <2 x float>* %source to i64*
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; CHECK: load i64*
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; CHECK: %call = call i64 @func_i64
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; CHECK: bitcast <2 x float>* %dest to i64*
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; CHECK: store i64
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%tmp = load <2 x float>* %source, align 8
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%call = call <2 x float> @alias_v2f32_to_i64(<2 x float> %tmp) nounwind
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store <2 x float> %call, <2 x float>* %dest, align 8
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ret void
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}
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define void @bitcast_alias_scalar_vector_same_size(i64* noalias %source, i64* noalias %dest) nounwind {
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entry:
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; CHECK-LABEL: @bitcast_alias_scalar_vector_same_size
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; CHECK: bitcast i64* %source to <2 x float>*
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; CHECK: load <2 x float>*
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; CHECK: call <2 x float> @func_v2f32
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; CHECK: bitcast i64* %dest to <2 x float>*
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; CHECK: store <2 x float>
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%tmp = load i64* %source, align 8
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%call = call i64 @alias_i64_to_v2f32(i64 %tmp) nounwind
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store i64 %call, i64* %dest, align 8
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ret void
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}
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define void @bitcast_alias_vector_ptrs_same_size(<2 x i64*>* noalias %source, <2 x i64*>* noalias %dest) nounwind {
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entry:
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; CHECK-LABEL: @bitcast_alias_vector_ptrs_same_size
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; CHECK: bitcast <2 x i64*>* %source to <2 x i32*>*
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; CHECK: load <2 x i32*>*
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; CHECK: call <2 x i32*> @func_v2i32p
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; CHECK: bitcast <2 x i64*>* %dest to <2 x i32*>*
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; CHECK: store <2 x i32*>
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%tmp = load <2 x i64*>* %source, align 8
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%call = call <2 x i64*> @alias_v2i32p_to_v2i64p(<2 x i64*> %tmp) nounwind
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store <2 x i64*> %call, <2 x i64*>* %dest, align 8
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ret void
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}
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; Invalid cases:
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define void @bitcast_alias_mismatch_scalar_size(float* noalias %source, float* noalias %dest) nounwind {
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entry:
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; CHECK-LABEL: @bitcast_alias_mismatch_scalar_size
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; CHECK-NOT: fptoui
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; CHECK: @alias_i64_to_f32
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; CHECK-NOT: uitofp
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%tmp = load float* %source, align 8
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%call = call float @alias_i64_to_f32(float %tmp) nounwind
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store float %call, float* %dest, align 8
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ret void
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}
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define void @bitcast_alias_mismatch_vector_element_and_bit_size(<2 x float>* noalias %source, <2 x float>* noalias %dest) nounwind {
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entry:
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; CHECK-LABEL: @bitcast_alias_mismatch_vector_element_and_bit_size
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; CHECK-NOT: fptoui <2 x float> %tmp to <2 x i64>
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; CHECK: @alias_v2i64_to_v2f32
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; CHECK-NOT: uitofp <2 x i64> %call to <2 x float>
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%tmp = load <2 x float>* %source, align 8
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%call = call <2 x float> @alias_v2i64_to_v2f32(<2 x float> %tmp) nounwind
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store <2 x float> %call, <2 x float>* %dest, align 8
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ret void
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}
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define void @bitcast_alias_vector_mismatched_number_elements(<4 x float>* noalias %source, <4 x float>* noalias %dest) nounwind {
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entry:
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; CHECK-LABEL: @bitcast_alias_vector_mismatched_number_elements
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; CHECK: %call = call <4 x float> @alias_v2i32_to_v4f32
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%tmp = load <4 x float>* %source, align 8
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%call = call <4 x float> @alias_v2i32_to_v4f32(<4 x float> %tmp) nounwind
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store <4 x float> %call, <4 x float>* %dest, align 8
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ret void
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}
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define void @bitcast_alias_vector_scalar_mismatched_bit_size(<4 x float>* noalias %source, <4 x float>* noalias %dest) nounwind {
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entry:
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; CHECK-LABEL: @bitcast_alias_vector_scalar_mismatched_bit_size
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; CHECK: %call = call <4 x float> @alias_v4f32_to_i64
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%tmp = load <4 x float>* %source, align 8
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%call = call <4 x float> @alias_v4f32_to_i64(<4 x float> %tmp) nounwind
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store <4 x float> %call, <4 x float>* %dest, align 8
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ret void
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}
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define void @bitcast_alias_vector_ptrs_scalar_mismatched_bit_size(<4 x i32*>* noalias %source, <4 x i32*>* noalias %dest) nounwind {
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entry:
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; CHECK-LABEL: @bitcast_alias_vector_ptrs_scalar_mismatched_bit_size
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; CHECK: @alias_v4i32p_to_i64
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%tmp = load <4 x i32*>* %source, align 8
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%call = call <4 x i32*> @alias_v4i32p_to_i64(<4 x i32*> %tmp) nounwind
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store <4 x i32*> %call, <4 x i32*>* %dest, align 8
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ret void
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}
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define void @bitcast_alias_scalar_vector_ptrs_same_size(i64* noalias %source, i64* noalias %dest) nounwind {
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entry:
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; CHECK-LABEL: @bitcast_alias_scalar_vector_ptrs_same_size
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; CHECK: @alias_i64_to_v2i32p
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%tmp = load i64* %source, align 8
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%call = call i64 @alias_i64_to_v2i32p(i64 %tmp) nounwind
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store i64 %call, i64* %dest, align 8
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ret void
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}
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define void @bitcast_alias_scalar_vector_mismatched_bit_size(i64* noalias %source, i64* noalias %dest) nounwind {
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entry:
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; CHECK-LABEL: @bitcast_alias_scalar_vector_mismatched_bit_size
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; CHECK: call i64 @alias_i64_to_v4f32
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%tmp = load i64* %source, align 8
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%call = call i64 @alias_i64_to_v4f32(i64 %tmp) nounwind
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store i64 %call, i64* %dest, align 8
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ret void
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}
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