133 lines
4.0 KiB
LLVM
133 lines
4.0 KiB
LLVM
; RUN: llc -mtriple x86_64-apple-darwin -O0 < %s -o - | FileCheck %s
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;
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; During X86 fastisel, the address of indirect call was resolved
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; through bitcast, ptrtoint, and inttoptr instructions. This is valid
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; only if the related instructions are in that same basic block, otherwise
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; we may reference variables that were not live across basic blocks
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; resulting in undefined virtual registers.
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;
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; In this example, this is illustrated by a spill/reload of the
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; LOADED_PTR_SLOT.
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;
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; Before this patch, the compiler was accessing two different spill
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; slots.
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; <rdar://problem/15192473>
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; CHECK-LABEL: @test_bitcast
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; Load the value of the function pointer: %loaded_ptr
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; Spill %arg2.
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; CHECK: movq %rdx, [[ARG2_SLOT:[0-9]*\(%[a-z]+\)]]
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; CHECK: movq (%rdi), [[LOADED_PTR:%[a-z]+]]
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; Spill %loaded_ptr.
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; CHECK: movq [[LOADED_PTR]], [[LOADED_PTR_SLOT:[0-9]*\(%[a-z]+\)]]
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; Perform the indirect call.
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; Load the function pointer.
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; CHECK: movq [[LOADED_PTR_SLOT]], [[FCT_PTR:%[a-z]+]]
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; Load the third argument
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; CHECK: movq [[ARG2_SLOT]], %rdx
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; Load the first argument
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; CHECK: movq %rdx, %rdi
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; Load the second argument
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; CHECK: movq %rdx, %rsi
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; Call.
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; CHECK: callq *[[FCT_PTR]]
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; CHECK: ret
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define i64 @test_bitcast(i64 (i64, i64, i64)** %arg, i1 %bool, i64 %arg2) {
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entry:
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%loaded_ptr = load i64 (i64, i64, i64)*, i64 (i64, i64, i64)** %arg, align 8
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%raw = bitcast i64 (i64, i64, i64)* %loaded_ptr to i8*
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switch i1 %bool, label %default [
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i1 true, label %label_true
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i1 false, label %label_end
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]
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default:
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br label %label_end
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label_true:
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br label %label_end
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label_end:
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%fct_ptr = bitcast i8* %raw to i64 (i64, i64, i64)*
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%res = call i64 %fct_ptr(i64 %arg2, i64 %arg2, i64 %arg2)
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ret i64 %res
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}
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; CHECK-LABEL: @test_inttoptr
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; Load the value of the function pointer: %loaded_ptr
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; CHECK: movq %rdx, [[ARG2_SLOT:[0-9]*\(%[a-z]+\)]]
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; Spill %loaded_ptr.
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; CHECK: movq (%rdi), [[LOADED_PTR:%[a-z]+]]
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; Spill %arg2.
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; CHECK: movq [[LOADED_PTR]], [[LOADED_PTR_SLOT:[0-9]*\(%[a-z]+\)]]
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; Perform the indirect call.
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; Load the function pointer.
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; CHECK: movq [[LOADED_PTR_SLOT]], [[FCT_PTR:%[a-z]+]]
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; Load the third argument
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; CHECK: movq [[ARG2_SLOT]], %rdx
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; Load the first argument
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; CHECK: movq %rdx, %rdi
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; Load the second argument
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; CHECK: movq %rdx, %rsi
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; Call.
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; CHECK: callq *[[FCT_PTR]]
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; CHECK: ret
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define i64 @test_inttoptr(i64 (i64, i64, i64)** %arg, i1 %bool, i64 %arg2) {
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entry:
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%loaded_ptr = load i64 (i64, i64, i64)*, i64 (i64, i64, i64)** %arg, align 8
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%raw = ptrtoint i64 (i64, i64, i64)* %loaded_ptr to i64
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switch i1 %bool, label %default [
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i1 true, label %label_true
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i1 false, label %label_end
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]
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default:
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br label %label_end
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label_true:
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br label %label_end
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label_end:
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%fct_ptr = inttoptr i64 %raw to i64 (i64, i64, i64)*
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%res = call i64 %fct_ptr(i64 %arg2, i64 %arg2, i64 %arg2)
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ret i64 %res
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}
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; CHECK-LABEL: @test_ptrtoint
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; Spill %arg2.
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; CHECK: movq %rdx, [[ARG2_SLOT:[0-9]*\(%[a-z]+\)]]
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; Load the value of the function pointer: %loaded_ptr
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; CHECK: movq (%rdi), [[LOADED_PTR:%[a-z]+]]
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; Spill %loaded_ptr.
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; CHECK: movq [[LOADED_PTR]], [[LOADED_PTR_SLOT:[0-9]*\(%[a-z]+\)]]
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; Perform the indirect call.
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; Load the function pointer.
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; CHECK: movq [[LOADED_PTR_SLOT]], [[FCT_PTR:%[a-z]+]]
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; Load the third argument
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; CHECK: movq [[ARG2_SLOT]], %rdx
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; Load the first argument
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; CHECK: movq %rdx, %rdi
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; Load the second argument
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; CHECK: movq %rdx, %rsi
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; Call.
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; CHECK: callq *[[FCT_PTR]]
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; CHECK: ret
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define i64 @test_ptrtoint(i64 (i64, i64, i64)** %arg, i1 %bool, i64 %arg2) {
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entry:
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%loaded_ptr = load i64 (i64, i64, i64)*, i64 (i64, i64, i64)** %arg, align 8
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%raw = bitcast i64 (i64, i64, i64)* %loaded_ptr to i8*
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switch i1 %bool, label %default [
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i1 true, label %label_true
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i1 false, label %label_end
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]
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default:
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br label %label_end
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label_true:
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br label %label_end
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label_end:
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%fct_int = ptrtoint i8* %raw to i64
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%fct_ptr = inttoptr i64 %fct_int to i64 (i64, i64, i64)*
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%res = call i64 %fct_ptr(i64 %arg2, i64 %arg2, i64 %arg2)
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ret i64 %res
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}
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