Add the PPC lfiwax instruction
This instruction is available on modern PPC64 CPUs, and is now used
to improve the SINT_TO_FP lowering (by eliminating the need for the
separate sign extension instruction and decreasing the amount of
needed stack space).
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@178446 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/PowerPC/PPCInstrInfo.td b/lib/Target/PowerPC/PPCInstrInfo.td
index d3d7dc6..478e612 100644
--- a/lib/Target/PowerPC/PPCInstrInfo.td
+++ b/lib/Target/PowerPC/PPCInstrInfo.td
@@ -20,6 +20,10 @@
def SDT_PPCstfiwx : SDTypeProfile<0, 2, [ // stfiwx
SDTCisVT<0, f64>, SDTCisPtrTy<1>
]>;
+def SDT_PPClfiwax : SDTypeProfile<1, 1, [ // lfiwax
+ SDTCisVT<0, f64>, SDTCisPtrTy<1>
+]>;
+
def SDT_PPCCallSeqStart : SDCallSeqStart<[ SDTCisVT<0, i32> ]>;
def SDT_PPCCallSeqEnd : SDCallSeqEnd<[ SDTCisVT<0, i32>,
SDTCisVT<1, i32> ]>;
@@ -63,6 +67,8 @@
def PPCfctiwz : SDNode<"PPCISD::FCTIWZ", SDTFPUnaryOp, []>;
def PPCstfiwx : SDNode<"PPCISD::STFIWX", SDT_PPCstfiwx,
[SDNPHasChain, SDNPMayStore]>;
+def PPClfiwax : SDNode<"PPCISD::LFIWAX", SDT_PPClfiwax,
+ [SDNPHasChain, SDNPMayLoad]>;
// Extract FPSCR (not modeled at the DAG level).
def PPCmffs : SDNode<"PPCISD::MFFS",
@@ -843,6 +849,10 @@
def LFDX : XForm_25<31, 599, (outs F8RC:$frD), (ins memrr:$src),
"lfdx $frD, $src", LdStLFD,
[(set f64:$frD, (load xaddr:$src))]>;
+
+def LFIWAX : XForm_25<31, 855, (outs F8RC:$frD), (ins memrr:$src),
+ "lfiwax $frD, $src", LdStLFD,
+ [(set f64:$frD, (PPClfiwax xoaddr:$src))]>;
}
//===----------------------------------------------------------------------===//