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authorChris Lattner <sabre@nondot.org>2011-04-18 06:55:51 +0000
committerChris Lattner <sabre@nondot.org>2011-04-18 06:55:51 +0000
commit090ca9108b35a60e8b97b67987d00cf47a383dba (patch)
treeb01a1dd485fcd75979a7ccd70578b6616d181018 /lib/CodeGen
parent202a7a1e3fa661bf78b98d77de7e2d575facd9ee (diff)
fix rdar://9297011 - udiv by power of two causing fast-isel rejects
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129693 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen')
-rw-r--r--lib/CodeGen/SelectionDAG/FastISel.cpp4
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/CodeGen/SelectionDAG/FastISel.cpp b/lib/CodeGen/SelectionDAG/FastISel.cpp
index 0f60cbfb9b..d3a721f875 100644
--- a/lib/CodeGen/SelectionDAG/FastISel.cpp
+++ b/lib/CodeGen/SelectionDAG/FastISel.cpp
@@ -990,6 +990,10 @@ unsigned FastISel::FastEmit_ri_(MVT VT, unsigned Opcode,
if (Opcode == ISD::MUL && isPowerOf2_64(Imm)) {
Opcode = ISD::SHL;
Imm = Log2_64(Imm);
+ } else if (Opcode == ISD::UDIV && isPowerOf2_64(Imm)) {
+ // div x, 8 -> srl x, 3
+ Opcode = ISD::SRL;
+ Imm = Log2_64(Imm);
}
// Horrible hack (to be removed), check to make sure shift amounts are