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When converting a test to a cmp to fold a load, use the cmp that has an

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8-bit immediate field rather than one with a wider immediate field.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104064 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2010-05-18 21:42:03 +00:00
parent b4e876e37e
commit e5efbafdac
2 changed files with 71 additions and 3 deletions
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6
lib/Target/X86/X86InstrInfo.cpp
View File

@ -2529,9 +2529,9 @@ MachineInstr* X86InstrInfo::foldMemoryOperandImpl(MachineFunction &MF,
switch (MI->getOpcode()) {
default: return NULL;
case X86::TEST8rr: NewOpc = X86::CMP8ri; RCSize = 1; break;
case X86::TEST16rr: NewOpc = X86::CMP16ri; RCSize = 2; break;
case X86::TEST32rr: NewOpc = X86::CMP32ri; RCSize = 4; break;
case X86::TEST64rr: NewOpc = X86::CMP64ri32; RCSize = 8; break;
case X86::TEST16rr: NewOpc = X86::CMP16ri8; RCSize = 2; break;
case X86::TEST32rr: NewOpc = X86::CMP32ri8; RCSize = 4; break;
case X86::TEST64rr: NewOpc = X86::CMP64ri8; RCSize = 8; break;
}
// Check if it's safe to fold the load. If the size of the object is
// narrower than the load width, then it's not.

68
test/CodeGen/X86/mcinst-lowering-cmp0.ll Normal file
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@ -0,0 +1,68 @@
; RUN: llc --show-mc-encoding -relocation-model=pic -disable-fp-elim -O3 < %s | FileCheck %s
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-n8:16:32"
target triple = "i386-apple-darwin10.0.0"
%struct.NSConstantString = type { i32*, i32, i8*, i32 }
%struct._objc_module = type { i32, i32, i8*, %struct._objc_symtab* }
%struct._objc_symtab = type { i32, i8*, i16, i16, [0 x i8*] }
@"\01L_OBJC_IMAGE_INFO" = internal constant [2 x i32] [i32 0, i32 16], section "__OBJC, __image_info,regular" ; <[2 x i32]*> [#uses=1]
@"\01L_OBJC_METH_VAR_NAME_" = internal global [4 x i8] c"foo\00", section "__TEXT,__cstring,cstring_literals", align 1 ; <[4 x i8]*> [#uses=1]
@"\01L_OBJC_SELECTOR_REFERENCES_" = internal global i8* getelementptr inbounds ([4 x i8]* @"\01L_OBJC_METH_VAR_NAME_", i32 0, i32 0), section "__OBJC,__message_refs,literal_pointers,no_dead_strip", align 4 ; <i8**> [#uses=3]
@__CFConstantStringClassReference = external global [0 x i32] ; <[0 x i32]*> [#uses=1]
@.str = private constant [3 x i8] c"||\00" ; <[3 x i8]*> [#uses=1]
@_unnamed_cfstring_ = private constant %struct.NSConstantString { i32* getelementptr inbounds ([0 x i32]* @__CFConstantStringClassReference, i32 0, i32 0), i32 1992, i8* getelementptr inbounds ([3 x i8]* @.str, i32 0, i32 0), i32 2 }, section "__DATA,__cfstring" ; <%struct.NSConstantString*> [#uses=1]
@"\01L_OBJC_METH_VAR_NAME_1" = internal global [5 x i8] c"baz:\00", section "__TEXT,__cstring,cstring_literals", align 1 ; <[5 x i8]*> [#uses=1]
@"\01L_OBJC_SELECTOR_REFERENCES_2" = internal global i8* getelementptr inbounds ([5 x i8]* @"\01L_OBJC_METH_VAR_NAME_1", i32 0, i32 0), section "__OBJC,__message_refs,literal_pointers,no_dead_strip", align 4 ; <i8**> [#uses=2]
@"\01L_OBJC_METH_VAR_NAME_3" = internal global [4 x i8] c"bar\00", section "__TEXT,__cstring,cstring_literals", align 1 ; <[4 x i8]*> [#uses=1]
@"\01L_OBJC_SELECTOR_REFERENCES_4" = internal global i8* getelementptr inbounds ([4 x i8]* @"\01L_OBJC_METH_VAR_NAME_3", i32 0, i32 0), section "__OBJC,__message_refs,literal_pointers,no_dead_strip", align 4 ; <i8**> [#uses=2]
@"\01L_OBJC_CLASS_NAME_" = internal global [1 x i8] zeroinitializer, section "__TEXT,__cstring,cstring_literals", align 1 ; <[1 x i8]*> [#uses=1]
@"\01L_OBJC_MODULES" = internal global %struct._objc_module { i32 7, i32 16, i8* getelementptr inbounds ([1 x i8]* @"\01L_OBJC_CLASS_NAME_", i32 0, i32 0), %struct._objc_symtab* null }, section "__OBJC,__module_info,regular,no_dead_strip", align 4 ; <%struct._objc_module*> [#uses=1]
@llvm.used = appending global [9 x i8*] [i8* bitcast ([2 x i32]* @"\01L_OBJC_IMAGE_INFO" to i8*), i8* getelementptr inbounds ([4 x i8]* @"\01L_OBJC_METH_VAR_NAME_", i32 0, i32 0), i8* bitcast (i8** @"\01L_OBJC_SELECTOR_REFERENCES_" to i8*), i8* getelementptr inbounds ([5 x i8]* @"\01L_OBJC_METH_VAR_NAME_1", i32 0, i32 0), i8* bitcast (i8** @"\01L_OBJC_SELECTOR_REFERENCES_2" to i8*), i8* getelementptr inbounds ([4 x i8]* @"\01L_OBJC_METH_VAR_NAME_3", i32 0, i32 0), i8* bitcast (i8** @"\01L_OBJC_SELECTOR_REFERENCES_4" to i8*), i8* getelementptr inbounds ([1 x i8]* @"\01L_OBJC_CLASS_NAME_", i32 0, i32 0), i8* bitcast (%struct._objc_module* @"\01L_OBJC_MODULES" to i8*)], section "llvm.metadata" ; <[9 x i8*]*> [#uses=0]
define void @f0(i8* nocapture %a, i8* nocapture %b) nounwind optsize ssp {
entry:
%call = tail call i32 (...)* @get_name() nounwind optsize ; <i32> [#uses=2]
%conv = inttoptr i32 %call to i8* ; <i8*> [#uses=1]
%call1 = tail call i32 (...)* @get_dict() nounwind optsize ; <i32> [#uses=2]
%conv2 = inttoptr i32 %call1 to i8* ; <i8*> [#uses=2]
; Check that we lower to the short form of cmpl, which has an 8-bit immediate.
;
; CHECK: cmpl $0, -16(%ebp) ## 4-byte Folded Reload
; CHECK: ## encoding: [0x83,0x7d,0xf0,0x00]
; rdar://7999130
%cmp = icmp eq i32 %call1, 0 ; <i1> [#uses=1]
br i1 %cmp, label %if.end, label %if.then
if.then: ; preds = %entry
%tmp5 = load i8** @"\01L_OBJC_SELECTOR_REFERENCES_" ; <i8*> [#uses=1]
%call6 = tail call i8* (i8*, i8*, ...)* @objc_msgSend(i8* %conv2, i8* %tmp5) nounwind optsize ; <i8*> [#uses=1]
%tmp7 = load i8** @"\01L_OBJC_SELECTOR_REFERENCES_2" ; <i8*> [#uses=1]
%call820 = tail call i8* (i8*, i8*, ...)* @objc_msgSend(i8* %call6, i8* %tmp7, i8* bitcast (%struct.NSConstantString* @_unnamed_cfstring_ to i8*)) nounwind optsize ; <i8*> [#uses=0]
br label %if.end
if.end: ; preds = %entry, %if.then
%tmp10 = load i8** @"\01L_OBJC_SELECTOR_REFERENCES_" ; <i8*> [#uses=1]
%call11 = tail call i8* (i8*, i8*, ...)* @objc_msgSend(i8* %conv2, i8* %tmp10) nounwind optsize ; <i8*> [#uses=1]
%tmp12 = load i8** @"\01L_OBJC_SELECTOR_REFERENCES_4" ; <i8*> [#uses=1]
%call13 = tail call i8* (i8*, i8*, ...)* @objc_msgSend(i8* %call11, i8* %tmp12) nounwind optsize ; <i8*> [#uses=0]
%cmp15 = icmp eq i32 %call, 0 ; <i1> [#uses=1]
br i1 %cmp15, label %if.end19, label %if.then17
if.then17: ; preds = %if.end
tail call void (...)* @f1(i8* %conv) nounwind optsize
ret void
if.end19: ; preds = %if.end
ret void
}
declare i32 @get_name(...) optsize
declare i32 @get_dict(...) optsize
declare i8* @objc_msgSend(i8*, i8*, ...)
declare void @f1(...) optsize