| Commit message (Collapse) | Author | Age | Files | Lines | |
|---|---|---|---|---|---|
| * | Add new llvm.loop.unroll.enable metadata for use with "#pragma unroll". | Mark Heffernan | 2015-08-10 | 1 | -2/+2 |
| | | | | | | | | | | | | | | | | | | | | | | | This change adds the new unroll metadata "llvm.loop.unroll.enable" which directs the optimizer to unroll a loop fully if the trip count is known at compile time, and unroll partially if the trip count is not known at compile time. This differs from "llvm.loop.unroll.full" which explicitly does not unroll a loop if the trip count is not known at compile time With this change "#pragma unroll" generates "llvm.loop.unroll.enable" rather than "llvm.loop.unroll.full" metadata. This changes the semantics of "#pragma unroll" slightly to mean "unroll aggressively (fully or partially)" rather than "unroll fully or not at all". The motivating example for this change was some internal code with a loop marked with "#pragma unroll" which only sometimes had a compile-time trip count depending on template magic. When the trip count was a compile-time constant, everything works as expected and the loop is fully unrolled. However, when the trip count was not a compile-time constant the "#pragma unroll" explicitly disabled unrolling of the loop(!). Removing "#pragma unroll" caused the loop to be unrolled partially which was desirable from a performance perspective. llvm-svn: 244467 | ||||
| * | Use CGLoopInfo to emit metadata for loop hint pragmas. | Tyler Nowicki | 2015-07-27 | 1 | -6/+13 |
| | | | | | | | | | When ‘#pragma clang loop vectorize(assume_safety)’ was specified on a loop other loop hints were lost. The problem is that CGLoopInfo attaches metadata differently than EmitCondBrHints in CGStmt. For do-loops CGLoopInfo attaches metadata to the br in the body block and for while and for loops, the inc block. EmitCondBrHints on the other hand always attaches data to the br in the cond block. When specifying assume_safety CGLoopInfo emits an empty llvm.loop metadata shadowing the metadata in the cond block. Loop transformations like rotate and unswitch would then eliminate the cond block and its non-empty metadata. This patch unifies both approaches for adding metadata and modifies the existing safety tests to include non-assume_safety loop hints. llvm-svn: 243315 | ||||
| * | Moved CPP CodeGen tests into CodeGenCXX. | Tyler Nowicki | 2015-06-08 | 1 | -0/+99 |
| llvm-svn: 239362 | |||||
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index : bcm5719-llvm | |
| Project Ortega BCM5719 LLVM | Raptor Computing Systems |
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