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| author | Chris Lattner <sabre@nondot.org> | 2011-04-18 06:55:51 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2011-04-18 06:55:51 +0000 |
| commit | 090ca9108b35a60e8b97b67987d00cf47a383dba (patch) | |
| tree | b01a1dd485fcd75979a7ccd70578b6616d181018 /lib/CodeGen/SelectionDAG/FastISel.cpp | |
| parent | 202a7a1e3fa661bf78b98d77de7e2d575facd9ee (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/SelectionDAG/FastISel.cpp')
| -rw-r--r-- | lib/CodeGen/SelectionDAG/FastISel.cpp | 4 |
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 |