http://llvm.org/bugs/show_bug.cgi?id=12760
Bug #: 12760
Summary: ARM: wrong pattern for SMMLS instruction
Product: libraries
Version: trunk
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P
Component: Backend: ARM
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Classification: Unclassified
The SMMLS instruction pattern is wrong, matching code of the form
a - ((b * c) >> 32)
while the instruction actually performs the operation
((a << 32) - b * c) >> 32
This means incorrect code is generated in some cases.
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