Mark re-materializable instructions.

llvm-svn: 35230

3 files changed, 6 insertions, 0 deletions

diff --git a/llvm/lib/Target/X86/X86InstrFPStack.td b/llvm/lib/Target/X86/X86InstrFPStack.td
index 48b216a199c..848d370db4d 100644
--- a/llvm/lib/Target/X86/X86InstrFPStack.td
+++ b/llvm/lib/Target/X86/X86InstrFPStack.td
@@ -413,10 +413,12 @@ def FSTPrr  : FPI<0xD8, AddRegFrm, (ops RST:$op), "fstp $op">, DD;
 def FXCH    : FPI<0xC8, AddRegFrm, (ops RST:$op), "fxch $op">, D9;
 
 // Floating point constant loads.
+let isReMaterializable = 1 in {
 def FpLD0 : FpI<(ops RFP:$dst), ZeroArgFP,
                 [(set RFP:$dst, fp64imm0)]>;
 def FpLD1 : FpI<(ops RFP:$dst), ZeroArgFP,
                 [(set RFP:$dst, fp64imm1)]>;
+}
 
 def FLD0 : FPI<0xEE, RawFrm, (ops), "fldz">, D9;
 def FLD1 : FPI<0xE8, RawFrm, (ops), "fld1">, D9;
diff --git a/llvm/lib/Target/X86/X86InstrInfo.td b/llvm/lib/Target/X86/X86InstrInfo.td
index 50bef5676c2..fd08e477014 100644
--- a/llvm/lib/Target/X86/X86InstrInfo.td
+++ b/llvm/lib/Target/X86/X86InstrInfo.td
@@ -601,6 +601,7 @@ def MOV16rr : I<0x89, MRMDestReg, (ops GR16:$dst, GR16:$src),
                 "mov{w} {$src, $dst|$dst, $src}", []>, OpSize;
 def MOV32rr : I<0x89, MRMDestReg, (ops GR32:$dst, GR32:$src),
                 "mov{l} {$src, $dst|$dst, $src}", []>;
+let isReMaterializable = 1 in {
 def MOV8ri  : Ii8 <0xB0, AddRegFrm, (ops GR8 :$dst, i8imm :$src),
                    "mov{b} {$src, $dst|$dst, $src}",
                    [(set GR8:$dst, imm:$src)]>;
@@ -610,6 +611,7 @@ def MOV16ri : Ii16<0xB8, AddRegFrm, (ops GR16:$dst, i16imm:$src),
 def MOV32ri : Ii32<0xB8, AddRegFrm, (ops GR32:$dst, i32imm:$src),
                    "mov{l} {$src, $dst|$dst, $src}",
                    [(set GR32:$dst, imm:$src)]>;
+}
 def MOV8mi  : Ii8 <0xC6, MRM0m, (ops i8mem :$dst, i8imm :$src),
                    "mov{b} {$src, $dst|$dst, $src}",
                    [(store (i8 imm:$src), addr:$dst)]>;
diff --git a/llvm/lib/Target/X86/X86InstrSSE.td b/llvm/lib/Target/X86/X86InstrSSE.td
index dff64169a8e..82831f7ecf1 100644
--- a/llvm/lib/Target/X86/X86InstrSSE.td
+++ b/llvm/lib/Target/X86/X86InstrSSE.td
@@ -1666,6 +1666,7 @@ def MWAIT   : I<0xC9, RawFrm, (ops), "mwait",
 
 // Alias instructions that map zero vector to pxor / xorp* for sse.
 // FIXME: remove when we can teach regalloc that xor reg, reg is ok.
+let isReMaterializable = 1 in {
 def V_SET0 : PSI<0x57, MRMInitReg, (ops VR128:$dst),
                  "xorps $dst, $dst",
                  [(set VR128:$dst, (v4f32 immAllZerosV))]>;
@@ -1673,6 +1674,7 @@ def V_SET0 : PSI<0x57, MRMInitReg, (ops VR128:$dst),
 def V_SETALLONES : PDI<0x76, MRMInitReg, (ops VR128:$dst),
                        "pcmpeqd $dst, $dst",
                        [(set VR128:$dst, (v2f64 immAllOnesV))]>;
+}
 
 // FR32 / FR64 to 128-bit vector conversion.
 def MOVSS2PSrr : SSI<0x10, MRMSrcReg, (ops VR128:$dst, FR32:$src),