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-rw-r--r--lib/Target/PowerPC/PPCInstrInfo.td7
1 files changed, 5 insertions, 2 deletions
diff --git a/lib/Target/PowerPC/PPCInstrInfo.td b/lib/Target/PowerPC/PPCInstrInfo.td
index de7306c9d3..a7dbe99231 100644
--- a/lib/Target/PowerPC/PPCInstrInfo.td
+++ b/lib/Target/PowerPC/PPCInstrInfo.td
@@ -17,7 +17,8 @@ include "PowerPCInstrFormats.td"
//===----------------------------------------------------------------------===//
// Selection DAG Type Constraint definitions.
//
-// Note that the semantics of these constraints are hard coded into tblgen.
+// Note that the semantics of these constraints are hard coded into tblgen. To
+// modify or add constraints, you have to hack tblgen.
//
class SDTypeConstraint<int opnum> {
@@ -66,7 +67,9 @@ class SDTypeProfile<int numresults, int numoperands,
// Builtin profiles.
def SDTImm : SDTypeProfile<1, 0, [SDTCisInt<0>]>; // for 'imm'.
def SDTVT : SDTypeProfile<1, 0, [SDTCisVT<0, OtherVT>]>; // for 'vt'
-def SDTBinOp : SDTypeProfile<1, 2, [SDTCisSameAs<0, 1>, SDTCisSameAs<0, 2>]>;
+def SDTBinOp : SDTypeProfile<1, 2, [ // add, mul, etc.
+ SDTCisSameAs<0, 1>, SDTCisSameAs<0, 2>
+]>;
def SDTIntBinOp : SDTypeProfile<1, 2, [ // and, or, xor, udiv, etc.
SDTCisSameAs<0, 1>, SDTCisSameAs<0, 2>, SDTCisInt<0>
]>;