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The pass used to be enabled by default with CodeGenOpt::Less (-O1). This is too aggressive, considering the pass indiscriminately merges all globals together. Currently, performance doesn't always improve, and, on code that uses few globals (e.g., the odd file- or function- static), more often than not is degraded by the optimization. Lengthy discussion can be found on llvmdev (AArch64-focused; ARM has similar problems): http://lists.cs.uiuc.edu/pipermail/llvmdev/2015-February/082800.html Also, it makes tooling and debuggers less useful when dealing with globals and data sections. GlobalMerge needs to better identify those cases that benefit, and this will be done separately. In the meantime, move the pass to run with -O3 rather than -O1, on both ARM and AArch64. llvm-svn: 233024
13 lines
383 B
LLVM
13 lines
383 B
LLVM
; RUN: llc < %s -mtriple=thumb-apple-darwin -O3 | FileCheck %s
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; Test the GlobalMerge pass. Check that the pass does not crash when using
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; multiple address spaces.
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; CHECK: _MergedGlobals:
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@g1 = internal addrspace(1) global i32 1
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@g2 = internal addrspace(1) global i32 2
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; CHECK: _MergedGlobals1:
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@g3 = internal addrspace(2) global i32 3
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@g4 = internal addrspace(2) global i32 4
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