Changes in directory llvm/lib/Target/X86:
X86ISelLowering.cpp updated: 1.250 -> 1.251
X86InstrInfo.td updated: 1.283 -> 1.284
---
Log message:
Eliminate X86ISD::TEST, using X86ISD::CMP instead. Match X86ISD::CMP patterns
using test, which provides nice simplifications like:
- movl %edi, %ecx
- andl $2, %ecx
- cmpl $0, %ecx
+ testl $2, %edi
je LBB1_11 #cond_next90
There are a couple of dagiselemitter deficiencies that this exposes, they will
be handled later.
---
Diffs of the changes: (+35 -29)
X86ISelLowering.cpp | 14 +++++++++-----
X86InstrInfo.td | 50 ++++++++++++++++++++++++++------------------------
2 files changed, 35 insertions(+), 29 deletions(-)
Index: llvm/lib/Target/X86/X86ISelLowering.cpp
diff -u llvm/lib/Target/X86/X86ISelLowering.cpp:1.250
llvm/lib/Target/X86/X86ISelLowering.cpp:1.251
--- llvm/lib/Target/X86/X86ISelLowering.cpp:1.250 Thu Aug 17 13:43:24 2006
+++ llvm/lib/Target/X86/X86ISelLowering.cpp Thu Sep 7 15:33:45 2006
@@ -2836,8 +2836,11 @@
Tmp3 = DAG.getNode(isSRA ? ISD::SRA : ISD::SRL, MVT::i32, ShOpHi, ShAmt);
}
- SDOperand InFlag = DAG.getNode(X86ISD::TEST, MVT::Flag,
- ShAmt, DAG.getConstant(32, MVT::i8));
+ SDOperand InFlag =
+ DAG.getNode(X86ISD::CMP, MVT::Flag,
+ DAG.getNode(ISD::AND, MVT::i8,
+ ShAmt, DAG.getConstant(32, MVT::i8)),
+ DAG.getConstant(0, MVT::i8));
SDOperand Hi, Lo;
SDOperand CC = DAG.getConstant(X86ISD::COND_NE, MVT::i8);
@@ -3134,7 +3137,8 @@
if (addTest) {
CC = DAG.getConstant(X86ISD::COND_NE, MVT::i8);
- Cond = DAG.getNode(X86ISD::TEST, MVT::Flag, Op0, Op0);
+ Cond = DAG.getNode(X86ISD::CMP, MVT::Flag, Op0,
+ DAG.getConstant(0, MVT::i8));
}
std::vector<MVT::ValueType> Tys;
@@ -3190,7 +3194,8 @@
if (addTest) {
CC = DAG.getConstant(X86ISD::COND_NE, MVT::i8);
- Cond = DAG.getNode(X86ISD::TEST, MVT::Flag, Cond, Cond);
+ Cond = DAG.getNode(X86ISD::CMP, MVT::Flag, Cond,
+ DAG.getConstant(0, MVT::i8));
}
return DAG.getNode(X86ISD::BRCOND, Op.getValueType(),
Op.getOperand(0), Op.getOperand(2), CC, Cond);
@@ -3774,7 +3779,6 @@
case X86ISD::TAILCALL: return "X86ISD::TAILCALL";
case X86ISD::RDTSC_DAG: return "X86ISD::RDTSC_DAG";
case X86ISD::CMP: return "X86ISD::CMP";
- case X86ISD::TEST: return "X86ISD::TEST";
case X86ISD::COMI: return "X86ISD::COMI";
case X86ISD::UCOMI: return "X86ISD::UCOMI";
case X86ISD::SETCC: return "X86ISD::SETCC";
Index: llvm/lib/Target/X86/X86InstrInfo.td
diff -u llvm/lib/Target/X86/X86InstrInfo.td:1.283
llvm/lib/Target/X86/X86InstrInfo.td:1.284
--- llvm/lib/Target/X86/X86InstrInfo.td:1.283 Thu Sep 7 14:03:48 2006
+++ llvm/lib/Target/X86/X86InstrInfo.td Thu Sep 7 15:33:45 2006
@@ -52,8 +52,6 @@
def X86cmp : SDNode<"X86ISD::CMP" , SDTX86CmpTest,
[SDNPOutFlag]>;
-def X86test : SDNode<"X86ISD::TEST", SDTX86CmpTest,
- [SDNPOutFlag]>;
def X86cmov : SDNode<"X86ISD::CMOV", SDTX86Cmov,
[SDNPInFlag, SDNPOutFlag]>;
@@ -2073,60 +2071,54 @@
let isCommutable = 1 in { // TEST X, Y --> TEST Y, X
def TEST8rr : I<0x84, MRMDestReg, (ops GR8:$src1, GR8:$src2),
"test{b} {$src2, $src1|$src1, $src2}",
- [(X86test GR8:$src1, GR8:$src2)]>;
+ [(X86cmp (and GR8:$src1, GR8:$src2), 0)]>;
def TEST16rr : I<0x85, MRMDestReg, (ops GR16:$src1, GR16:$src2),
"test{w} {$src2, $src1|$src1, $src2}",
- [(X86test GR16:$src1, GR16:$src2)]>, OpSize;
+ [(X86cmp (and GR16:$src1, GR16:$src2), 0)]>, OpSize;
def TEST32rr : I<0x85, MRMDestReg, (ops GR32:$src1, GR32:$src2),
"test{l} {$src2, $src1|$src1, $src2}",
- [(X86test GR32:$src1, GR32:$src2)]>;
+ [(X86cmp (and GR32:$src1, GR32:$src2), 0)]>;
}
-def TEST8mr : I<0x84, MRMDestMem, (ops i8mem :$src1, GR8 :$src2),
- "test{b} {$src2, $src1|$src1, $src2}",
- [(X86test (loadi8 addr:$src1), GR8:$src2)]>;
-def TEST16mr : I<0x85, MRMDestMem, (ops i16mem:$src1, GR16:$src2),
- "test{w} {$src2, $src1|$src1, $src2}",
- [(X86test (loadi16 addr:$src1), GR16:$src2)]>,
- OpSize;
-def TEST32mr : I<0x85, MRMDestMem, (ops i32mem:$src1, GR32:$src2),
- "test{l} {$src2, $src1|$src1, $src2}",
- [(X86test (loadi32 addr:$src1), GR32:$src2)]>;
+// FIXME: These patterns are disabled until isel issue surrounding
+//CodeGen/X86/test-load-fold.ll is fixed.
def TEST8rm : I<0x84, MRMSrcMem, (ops GR8 :$src1, i8mem :$src2),
"test{b} {$src2, $src1|$src1, $src2}",
- [(X86test GR8:$src1, (loadi8 addr:$src2))]>;
+ [/*(X86cmp (and GR8:$src1, (loadi8 addr:$src2)), 0)*/]>;
def TEST16rm : I<0x85, MRMSrcMem, (ops GR16:$src1, i16mem:$src2),
"test{w} {$src2, $src1|$src1, $src2}",
- [(X86test GR16:$src1, (loadi16 addr:$src2))]>,
+ [/*(X86cmp (and GR16:$src1, (loadi16 addr:$src2)), 0)*/]>,
OpSize;
def TEST32rm : I<0x85, MRMSrcMem, (ops GR32:$src1, i32mem:$src2),
"test{l} {$src2, $src1|$src1, $src2}",
- [(X86test GR32:$src1, (loadi32 addr:$src2))]>;
+ [/*(X86cmp (and GR32:$src1, (loadi32 addr:$src2)), 0)*/]>;
def TEST8ri : Ii8 <0xF6, MRM0r, // flags = GR8 & imm8
(ops GR8:$src1, i8imm:$src2),
"test{b} {$src2, $src1|$src1, $src2}",
- [(X86test GR8:$src1, imm:$src2)]>;
+ [(X86cmp (and GR8:$src1, imm:$src2), 0)]>;
def TEST16ri : Ii16<0xF7, MRM0r, // flags = GR16 & imm16
(ops GR16:$src1, i16imm:$src2),
"test{w} {$src2, $src1|$src1, $src2}",
- [(X86test GR16:$src1, imm:$src2)]>, OpSize;
+ [(X86cmp (and GR16:$src1, imm:$src2), 0)]>, OpSize;
def TEST32ri : Ii32<0xF7, MRM0r, // flags = GR32 & imm32
(ops GR32:$src1, i32imm:$src2),
"test{l} {$src2, $src1|$src1, $src2}",
- [(X86test GR32:$src1, imm:$src2)]>;
+ [(X86cmp (and GR32:$src1, imm:$src2), 0)]>;
+// FIXME: These patterns are disabled until isel issue surrounding
+//CodeGen/X86/test-load-fold.ll is fixed.
def TEST8mi : Ii8 <0xF6, MRM0m, // flags = [mem8] & imm8
(ops i8mem:$src1, i8imm:$src2),
"test{b} {$src2, $src1|$src1, $src2}",
- [(X86test (loadi8 addr:$src1), imm:$src2)]>;
+ [/*(X86cmp (and (loadi8 addr:$src1), imm:$src2), 0)*/]>;
def TEST16mi : Ii16<0xF7, MRM0m, // flags = [mem16] & imm16
(ops i16mem:$src1, i16imm:$src2),
"test{w} {$src2, $src1|$src1, $src2}",
- [(X86test (loadi16 addr:$src1), imm:$src2)]>,
+ [/*(X86cmp (and (loadi16 addr:$src1), imm:$src2), 0)*/]>,
OpSize;
def TEST32mi : Ii32<0xF7, MRM0m, // flags = [mem32] & imm32
(ops i32mem:$src1, i32imm:$src2),
"test{l} {$src2, $src1|$src1, $src2}",
- [(X86test (loadi32 addr:$src1), imm:$src2)]>;
+ [/*(X86cmp (and (loadi32 addr:$src1), imm:$src2), 0)*/]>;
// Condition code ops, incl. set if equal/not equal/...
@@ -2523,6 +2515,16 @@
def : Pat<(truncstore GR8:$src, addr:$dst, i1),
(MOV8mr addr:$dst, GR8:$src)>;
+// Comparisons.
+
+// TEST R,R is smaller than CMP R,0
+def : Pat<(X86cmp GR8:$src1, 0),
+ (TEST8rr GR8:$src1, GR8:$src1)>;
+def : Pat<(X86cmp GR16:$src1, 0),
+ (TEST16rr GR16:$src1, GR16:$src1)>;
+def : Pat<(X86cmp GR32:$src1, 0),
+ (TEST32rr GR32:$src1, GR32:$src1)>;
+
// {s|z}extload bool -> {s|z}extload byte
def : Pat<(sextloadi16i1 addr:$src), (MOVSX16rm8 addr:$src)>;
def : Pat<(sextloadi32i1 addr:$src), (MOVSX32rm8 addr:$src)>;
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