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| author | Simon Marlow <marlowsd@gmail.com> | 2014-07-31 11:47:35 +0100 |
|---|---|---|
| committer | Simon Marlow <marlowsd@gmail.com> | 2014-08-01 12:45:41 +0100 |
| commit | aab5937405d379ee2e9ac0a54f145ca4005cf283 (patch) | |
| tree | 46ee105d6e1f98fd9279bc235db4324baf86237b /compiler | |
| parent | 028630ab2153d4a6eb473fef6e18130388a68636 (diff) | |
| download | haskell-aab5937405d379ee2e9ac0a54f145ca4005cf283.tar.gz | |
update comment
Diffstat (limited to 'compiler')
| -rw-r--r-- | compiler/cmm/CmmPipeline.hs | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/compiler/cmm/CmmPipeline.hs b/compiler/cmm/CmmPipeline.hs index 4314695201..af4f62a4a8 100644 --- a/compiler/cmm/CmmPipeline.hs +++ b/compiler/cmm/CmmPipeline.hs @@ -326,10 +326,9 @@ _GLOBAL_OFFSET_TABLE_, regardless of which entry point we arrived via. {- Note [unreachable blocks] The control-flow optimiser sometimes leaves unreachable blocks behind -containing junk code. If these blocks make it into the native code -generator then they trigger a register allocator panic because they -refer to undefined LocalRegs, so we must eliminate any unreachable -blocks before passing the code onwards. +containing junk code. These aren't necessarily a problem, but +removing them is good because it might save time in the native code +generator later. -} |