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When x86 addresses matching exceeds its recursion limit, check to 

see if the base register is already occupied before assuming it can be
used. This fixes bogus code generation in the accompanying testcase.

llvm-svn: 41049
This commit is contained in:
Dan Gohman 2007-08-13 20:03:06 +00:00
parent 4e7f673f65
commit ccb3611881
2 changed files with 59 additions and 6 deletions
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18
llvm/lib/Target/X86/X86ISelDAGToDAG.cpp
View File

@ -142,6 +142,8 @@ namespace {
bool MatchAddress(SDOperand N, X86ISelAddressMode &AM,
bool isRoot = true, unsigned Depth = 0);
bool MatchAddressBase(SDOperand N, X86ISelAddressMode &AM,
bool isRoot, unsigned Depth);
bool SelectAddr(SDOperand Op, SDOperand N, SDOperand &Base,
SDOperand &Scale, SDOperand &Index, SDOperand &Disp);
bool SelectLEAAddr(SDOperand Op, SDOperand N, SDOperand &Base,
@ -572,12 +574,9 @@ void X86DAGToDAGISel::EmitFunctionEntryCode(Function &Fn, MachineFunction &MF) {
/// addressing mode
bool X86DAGToDAGISel::MatchAddress(SDOperand N, X86ISelAddressMode &AM,
bool isRoot, unsigned Depth) {
if (Depth > 5) {
// Default, generate it as a register.
AM.BaseType = X86ISelAddressMode::RegBase;
AM.Base.Reg = N;
return false;
}
// Limit recursion.
if (Depth > 5)
return MatchAddressBase(N, AM, isRoot, Depth);
// RIP relative addressing: %rip + 32-bit displacement!
if (AM.isRIPRel) {
@ -763,6 +762,13 @@ bool X86DAGToDAGISel::MatchAddress(SDOperand N, X86ISelAddressMode &AM,
break;
}
return MatchAddressBase(N, AM, isRoot, Depth);
}
/// MatchAddressBase - Helper for MatchAddress. Add the specified node to the
/// specified addressing mode without any further recursion.
bool X86DAGToDAGISel::MatchAddressBase(SDOperand N, X86ISelAddressMode &AM,
bool isRoot, unsigned Depth) {
// Is the base register already occupied?
if (AM.BaseType != X86ISelAddressMode::RegBase || AM.Base.Reg.Val) {
// If so, check to see if the scale index register is set.

47
llvm/test/CodeGen/X86/lea-recursion.ll Normal file
View File

@ -0,0 +1,47 @@
; RUN: llvm-as < %s | llc -march=x86-64 | grep lea | wc -l | grep 12
; This testcase was written to demonstrate an instruction-selection problem,
; however it also happens to expose a limitation in the DAGCombiner's
; expression reassociation which causes it to miss opportunities for
; constant folding due to the intermediate adds having multiple uses.
; The Reassociate pass has similar limitations. If these limitations are
; fixed, the test commands above will need to be updated to expect fewer
; lea instructions.
@g0 = weak global [1000 x i32] zeroinitializer, align 32 ; <[1000 x i32]*> [#uses=8]
@g1 = weak global [1000 x i32] zeroinitializer, align 32 ; <[1000 x i32]*> [#uses=7]
define void @foo() {
entry:
%tmp4 = load i32* getelementptr ([1000 x i32]* @g0, i32 0, i32 0) ; <i32> [#uses=1]
%tmp8 = load i32* getelementptr ([1000 x i32]* @g1, i32 0, i32 0) ; <i32> [#uses=1]
%tmp9 = add i32 %tmp4, 1 ; <i32> [#uses=1]
%tmp10 = add i32 %tmp9, %tmp8 ; <i32> [#uses=2]
store i32 %tmp10, i32* getelementptr ([1000 x i32]* @g0, i32 0, i32 1)
%tmp8.1 = load i32* getelementptr ([1000 x i32]* @g1, i32 0, i32 1) ; <i32> [#uses=1]
%tmp9.1 = add i32 %tmp10, 1 ; <i32> [#uses=1]
%tmp10.1 = add i32 %tmp9.1, %tmp8.1 ; <i32> [#uses=2]
store i32 %tmp10.1, i32* getelementptr ([1000 x i32]* @g0, i32 0, i32 2)
%tmp8.2 = load i32* getelementptr ([1000 x i32]* @g1, i32 0, i32 2) ; <i32> [#uses=1]
%tmp9.2 = add i32 %tmp10.1, 1 ; <i32> [#uses=1]
%tmp10.2 = add i32 %tmp9.2, %tmp8.2 ; <i32> [#uses=2]
store i32 %tmp10.2, i32* getelementptr ([1000 x i32]* @g0, i32 0, i32 3)
%tmp8.3 = load i32* getelementptr ([1000 x i32]* @g1, i32 0, i32 3) ; <i32> [#uses=1]
%tmp9.3 = add i32 %tmp10.2, 1 ; <i32> [#uses=1]
%tmp10.3 = add i32 %tmp9.3, %tmp8.3 ; <i32> [#uses=2]
store i32 %tmp10.3, i32* getelementptr ([1000 x i32]* @g0, i32 0, i32 4)
%tmp8.4 = load i32* getelementptr ([1000 x i32]* @g1, i32 0, i32 4) ; <i32> [#uses=1]
%tmp9.4 = add i32 %tmp10.3, 1 ; <i32> [#uses=1]
%tmp10.4 = add i32 %tmp9.4, %tmp8.4 ; <i32> [#uses=2]
store i32 %tmp10.4, i32* getelementptr ([1000 x i32]* @g0, i32 0, i32 5)
%tmp8.5 = load i32* getelementptr ([1000 x i32]* @g1, i32 0, i32 5) ; <i32> [#uses=1]
%tmp9.5 = add i32 %tmp10.4, 1 ; <i32> [#uses=1]
%tmp10.5 = add i32 %tmp9.5, %tmp8.5 ; <i32> [#uses=2]
store i32 %tmp10.5, i32* getelementptr ([1000 x i32]* @g0, i32 0, i32 6)
%tmp8.6 = load i32* getelementptr ([1000 x i32]* @g1, i32 0, i32 6) ; <i32> [#uses=1]
%tmp9.6 = add i32 %tmp10.5, 1 ; <i32> [#uses=1]
%tmp10.6 = add i32 %tmp9.6, %tmp8.6 ; <i32> [#uses=1]
store i32 %tmp10.6, i32* getelementptr ([1000 x i32]* @g0, i32 0, i32 7)
ret void
}