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