forked from OSchip/llvm-project
47 lines
1.3 KiB
LLVM
47 lines
1.3 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
|
|
; RUN: llc < %s -mtriple=x86_64-apple-darwin | FileCheck %s
|
|
|
|
define void @redundant_add(i64 %n) {
|
|
; Check that we don't create two additions for the sadd.with.overflow.
|
|
; CHECK-LABEL: redundant_add:
|
|
; CHECK: ## %bb.0: ## %entry
|
|
; CHECK-NEXT: xorl %eax, %eax
|
|
; CHECK-NEXT: .p2align 4, 0x90
|
|
; CHECK-NEXT: LBB0_1: ## %exit_check
|
|
; CHECK-NEXT: ## =>This Inner Loop Header: Depth=1
|
|
; CHECK-NEXT: cmpq %rdi, %rax
|
|
; CHECK-NEXT: jge LBB0_4
|
|
; CHECK-NEXT: ## %bb.2: ## %loop
|
|
; CHECK-NEXT: ## in Loop: Header=BB0_1 Depth=1
|
|
; CHECK-NEXT: incq %rax
|
|
; CHECK-NEXT: jno LBB0_1
|
|
; CHECK-NEXT: ## %bb.3: ## %overflow
|
|
; CHECK-NEXT: ud2
|
|
; CHECK-NEXT: LBB0_4: ## %exit
|
|
; CHECK-NEXT: retq
|
|
entry:
|
|
br label %exit_check
|
|
|
|
exit_check:
|
|
%i = phi i64 [ 0, %entry ], [ %i.next, %loop ]
|
|
%c = icmp slt i64 %i, %n
|
|
br i1 %c, label %loop, label %exit
|
|
|
|
loop:
|
|
%i.o = tail call { i64, i1 } @llvm.sadd.with.overflow.i64(i64 %i, i64 1)
|
|
%i.next = extractvalue { i64, i1 } %i.o, 0
|
|
%o = extractvalue { i64, i1 } %i.o, 1
|
|
br i1 %o, label %overflow, label %exit_check
|
|
|
|
exit:
|
|
ret void
|
|
|
|
overflow:
|
|
tail call void @llvm.trap()
|
|
unreachable
|
|
}
|
|
|
|
declare { i64, i1 } @llvm.sadd.with.overflow.i64(i64, i64)
|
|
declare void @llvm.trap()
|
|
|