9c41a93e24
Summary: This change introduces a !make.implicit metadata that allows the frontend to pre-select the set of explicit null checks that will be considered for transformation into implicit null checks. The reason for not using profiling data instead of !make.implicit is explained in the change to `FaultMaps.rst`. Reviewers: atrick, reames, pgavlin, JosephTremoulet Subscribers: llvm-commits Differential Revision: http://reviews.llvm.org/D10824 llvm-svn: 241116
141 lines
3.5 KiB
LLVM
141 lines
3.5 KiB
LLVM
; RUN: llc -O3 -mtriple=x86_64-apple-macosx -enable-implicit-null-checks < %s | FileCheck %s
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; RUN: llc < %s -mtriple=x86_64-apple-macosx -enable-implicit-null-checks \
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; RUN: | llvm-mc -triple x86_64-apple-macosx -filetype=obj -o - \
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; RUN: | llvm-objdump -triple x86_64-apple-macosx -fault-map-section - \
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; RUN: | FileCheck %s -check-prefix OBJDUMP
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; RUN: llc < %s -mtriple=x86_64-unknown-linux-gnu -enable-implicit-null-checks \
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; RUN: | llvm-mc -triple x86_64-unknown-linux-gnu -filetype=obj -o - \
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; RUN: | llvm-objdump -triple x86_64-unknown-linux-gnu -fault-map-section - \
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; RUN: | FileCheck %s -check-prefix OBJDUMP
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define i32 @imp_null_check_load(i32* %x) {
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; CHECK-LABEL: _imp_null_check_load:
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; CHECK: Ltmp1:
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; CHECK: movl (%rdi), %eax
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; CHECK: retq
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; CHECK: Ltmp0:
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; CHECK: movl $42, %eax
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; CHECK: retq
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entry:
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%c = icmp eq i32* %x, null
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br i1 %c, label %is_null, label %not_null, !make.implicit !0
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is_null:
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ret i32 42
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not_null:
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%t = load i32, i32* %x
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ret i32 %t
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}
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define i32 @imp_null_check_gep_load(i32* %x) {
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; CHECK-LABEL: _imp_null_check_gep_load:
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; CHECK: Ltmp3:
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; CHECK: movl 128(%rdi), %eax
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; CHECK: retq
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; CHECK: Ltmp2:
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; CHECK: movl $42, %eax
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; CHECK: retq
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entry:
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%c = icmp eq i32* %x, null
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br i1 %c, label %is_null, label %not_null, !make.implicit !0
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is_null:
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ret i32 42
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not_null:
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%x.gep = getelementptr i32, i32* %x, i32 32
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%t = load i32, i32* %x.gep
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ret i32 %t
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}
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define i32 @imp_null_check_add_result(i32* %x, i32 %p) {
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; CHECK-LABEL: _imp_null_check_add_result:
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; CHECK: Ltmp5:
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; CHECK: addl (%rdi), %esi
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; CHECK: movl %esi, %eax
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; CHECK: retq
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; CHECK: Ltmp4:
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; CHECK: movl $42, %eax
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; CHECK: retq
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entry:
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%c = icmp eq i32* %x, null
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br i1 %c, label %is_null, label %not_null, !make.implicit !0
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is_null:
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ret i32 42
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not_null:
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%t = load i32, i32* %x
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%p1 = add i32 %t, %p
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ret i32 %p1
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}
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!0 = !{}
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; CHECK-LABEL: __LLVM_FaultMaps:
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; Version:
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; CHECK-NEXT: .byte 1
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; Reserved x2
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; CHECK-NEXT: .byte 0
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; CHECK-NEXT: .short 0
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; # functions:
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; CHECK-NEXT: .long 3
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; FunctionAddr:
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; CHECK-NEXT: .quad _imp_null_check_add_result
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; NumFaultingPCs
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; CHECK-NEXT: .long 1
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; Reserved:
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; CHECK-NEXT: .long 0
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; Fault[0].Type:
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; CHECK-NEXT: .long 1
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; Fault[0].FaultOffset:
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; CHECK-NEXT: .long Ltmp5-_imp_null_check_add_result
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; Fault[0].HandlerOffset:
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; CHECK-NEXT: .long Ltmp4-_imp_null_check_add_result
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; FunctionAddr:
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; CHECK-NEXT: .quad _imp_null_check_gep_load
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; NumFaultingPCs
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; CHECK-NEXT: .long 1
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; Reserved:
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; CHECK-NEXT: .long 0
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; Fault[0].Type:
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; CHECK-NEXT: .long 1
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; Fault[0].FaultOffset:
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; CHECK-NEXT: .long Ltmp3-_imp_null_check_gep_load
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; Fault[0].HandlerOffset:
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; CHECK-NEXT: .long Ltmp2-_imp_null_check_gep_load
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; FunctionAddr:
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; CHECK-NEXT: .quad _imp_null_check_load
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; NumFaultingPCs
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; CHECK-NEXT: .long 1
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; Reserved:
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; CHECK-NEXT: .long 0
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; Fault[0].Type:
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; CHECK-NEXT: .long 1
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; Fault[0].FaultOffset:
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; CHECK-NEXT: .long Ltmp1-_imp_null_check_load
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; Fault[0].HandlerOffset:
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; CHECK-NEXT: .long Ltmp0-_imp_null_check_load
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; OBJDUMP: FaultMap table:
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; OBJDUMP-NEXT: Version: 0x1
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; OBJDUMP-NEXT: NumFunctions: 3
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; OBJDUMP-NEXT: FunctionAddress: 0x000000, NumFaultingPCs: 1
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; OBJDUMP-NEXT: Fault kind: FaultingLoad, faulting PC offset: 0, handling PC offset: 5
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; OBJDUMP-NEXT: FunctionAddress: 0x000000, NumFaultingPCs: 1
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; OBJDUMP-NEXT: Fault kind: FaultingLoad, faulting PC offset: 0, handling PC offset: 7
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; OBJDUMP-NEXT: FunctionAddress: 0x000000, NumFaultingPCs: 1
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; OBJDUMP-NEXT: Fault kind: FaultingLoad, faulting PC offset: 0, handling PC offset: 3
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