diff options
Diffstat (limited to 'test')
| -rw-r--r-- | test/CodeGen/X86/2013-10-14-FastISel-incorrect-vreg.ll | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/test/CodeGen/X86/2013-10-14-FastISel-incorrect-vreg.ll b/test/CodeGen/X86/2013-10-14-FastISel-incorrect-vreg.ll new file mode 100644 index 0000000..3455b68 --- /dev/null +++ b/test/CodeGen/X86/2013-10-14-FastISel-incorrect-vreg.ll @@ -0,0 +1,132 @@ +; 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 accross basic blocks +; resulting in undefined virtual registers. +; +; In this example, this is illustrated by a the 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 thrid 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)** %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: + unreachable + +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 thrid 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)** %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: + unreachable + +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 thrid 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)** %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: + unreachable + +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 +} |