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llvm-project/llvm/test/Transforms/GlobalOpt/2009-03-07-PromotePtrToBool.ll

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GlobalOpt: Convert a bunch of tests from grep to FileCheck llvm-svn: 267493
2016-04-26 07:36:50 +08:00
; RUN: opt < %s -globalopt -S | FileCheck %s
fix a serious pessimization that Tron on IRC pointed out where we would "boolify" pointers, generating really awful code because getting the pointer value requires a load itself. Before: _foo: movb $1, _X.b ret _get: xorl %ecx, %ecx movb _X.b, %al testb %al, %al movl $_Y, %eax cmove %ecx, %eax ret With the xform disabled: _foo: movl $_Y, _X ret _get: movl _X, %eax ret llvm-svn: 66351
2009-03-08 07:32:02 +08:00
target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
target triple = "i386-apple-darwin7"
GlobalOpt: Convert a bunch of tests from grep to FileCheck llvm-svn: 267493
2016-04-26 07:36:50 +08:00
; CHECK: @X = internal unnamed_addr global i32
fix a serious pessimization that Tron on IRC pointed out where we would "boolify" pointers, generating really awful code because getting the pointer value requires a load itself. Before: _foo: movb $1, _X.b ret _get: xorl %ecx, %ecx movb _X.b, %al testb %al, %al movl $_Y, %eax cmove %ecx, %eax ret With the xform disabled: _foo: movl $_Y, _X ret _get: movl _X, %eax ret llvm-svn: 66351
2009-03-08 07:32:02 +08:00
@X = internal global i32* null ; <i32**> [#uses=2]
@Y = internal global i32 0 ; <i32*> [#uses=1]
define void @foo() nounwind {
entry:
store i32* @Y, i32** @X, align 4
ret void
}
define i32* @get() nounwind {
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"((?:=|:|^)\s*load (?: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 llvm-svn: 230794
2015-02-28 05:17:42 +08:00
%0 = load i32*, i32** @X, align 4 ; <i32*> [#uses=1]
fix a serious pessimization that Tron on IRC pointed out where we would "boolify" pointers, generating really awful code because getting the pointer value requires a load itself. Before: _foo: movb $1, _X.b ret _get: xorl %ecx, %ecx movb _X.b, %al testb %al, %al movl $_Y, %eax cmove %ecx, %eax ret With the xform disabled: _foo: movl $_Y, _X ret _get: movl _X, %eax ret llvm-svn: 66351
2009-03-08 07:32:02 +08:00
ret i32* %0
}