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https://github.com/c64scene-ar/llvm-6502.git
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8d5b28507b
Summary: This change adds an "ImplicitNullChecks" target dependent pass. This pass folds null checks into memory operation using the FAULTING_LOAD pseudo-op introduced in previous patches. Depends on D10197 Depends on D10199 Depends on D10200 Reviewers: reames, rnk, pgavlin, JosephTremoulet, atrick Reviewed By: atrick Subscribers: ab, JosephTremoulet, llvm-commits Differential Revision: http://reviews.llvm.org/D10201 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@239743 91177308-0d34-0410-b5e6-96231b3b80d8
119 lines
2.4 KiB
LLVM
119 lines
2.4 KiB
LLVM
; RUN: llc -O3 -mtriple=x86_64-apple-macosx -enable-implicit-null-checks < %s | FileCheck %s
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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
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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
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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
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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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; 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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