[Hexagon] Use correct offset when extracting from the high word

When extracting a bitfield from the high register in a register pair,
the final offset should be relative to the high register (for 32-bit
extracts).

llvm-svn: 297288

1 files changed, 1 insertions, 0 deletions

diff --git a/llvm/lib/Target/Hexagon/HexagonBitSimplify.cpp b/llvm/lib/Target/Hexagon/HexagonBitSimplify.cpp
index 5fef6083552..41d4f6c17e8 100644
--- a/llvm/lib/Target/Hexagon/HexagonBitSimplify.cpp
+++ b/llvm/lib/Target/Hexagon/HexagonBitSimplify.cpp
@@ -2480,6 +2480,7 @@ bool BitSimplification::simplifyExtractLow(MachineInstr *MI,
       continue;
     if (RW != SW)
       SR = (Off/RW == 0) ? Hexagon::isub_lo : Hexagon::isub_hi;
+    Off = Off % RW;
 
     if (!validateReg({R,SR}, ExtOpc, 1))
       continue;