llvm-6502/test/CodeGen/X86/simple-zext.ll

; RUN: llc -mtriple=x86_64-apple-darwin < %s| FileCheck %s

; A bug in DAGCombiner prevented it forming a zextload in this simple case
; because it counted both the chain user and the real user against the
; profitability total.

define void @load_zext(i32* nocapture %p){
entry:
  %0 = load i32, i32* %p, align 4
  %and = and i32 %0, 255
  tail call void @use(i32 %and)
  ret void
; CHECK: movzbl ({{%r[a-z]+}}), {{%e[a-z]+}}
}

declare void @use(i32)
DAGCombiner: fix use-counting issue when forming zextload DAGCombiner was counting all uses of a load node when considering whether it's worth combining into a zextload. Really, it wants to ignore the chain and just count real uses. rdar://problem/13896307 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185419 91177308-0d34-0410-b5e6-96231b3b80d8 2013-07-02 09:58:53 +00:00			`; RUN: llc -mtriple=x86_64-apple-darwin < %s\| FileCheck %s`

			`; A bug in DAGCombiner prevented it forming a zextload in this simple case`
			`; because it counted both the chain user and the real user against the`
			`; profitability total.`

			`define void @load_zext(i32* nocapture %p){`
			`entry:`
[opaque pointer type] Add textual IR support for explicit type parameter to load instruction Essentially the same as the GEP change in r230786. A similar migration script can be used to update test cases, though a few more test case improvements/changes were required this time around: (r229269-r229278) import fileinput import sys import re pat = re.compile(r"((?:=\|:\|^)\sload (?:atomic )?(?:volatile )?(.?))(\| addrspace\(\d+\) )\($\| (?:%\|@\|null\|undef\|blockaddress\|getelementptr\|addrspacecast\|bitcast\|inttoptr\|\[\[[a-zA-Z]\|\{\{).$)") for line in sys.stdin: sys.stdout.write(re.sub(pat, r"\1, \2\3*\4", line)) Reviewers: rafael, dexonsmith, grosser Differential Revision: http://reviews.llvm.org/D7649 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@230794 91177308-0d34-0410-b5e6-96231b3b80d8 2015-02-27 21:17:42 +00:00			`%0 = load i32, i32* %p, align 4`
DAGCombiner: fix use-counting issue when forming zextload DAGCombiner was counting all uses of a load node when considering whether it's worth combining into a zextload. Really, it wants to ignore the chain and just count real uses. rdar://problem/13896307 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185419 91177308-0d34-0410-b5e6-96231b3b80d8 2013-07-02 09:58:53 +00:00			`%and = and i32 %0, 255`
			`tail call void @use(i32 %and)`
			`ret void`
			`; CHECK: movzbl ({{%r[a-z]+}}), {{%e[a-z]+}}`
			`}`

			`declare void @use(i32)`