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| author | Bill Wendling <isanbard@gmail.com> | 2006-09-07 08:36:28 +0000 |
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| committer | Bill Wendling <isanbard@gmail.com> | 2006-09-07 08:36:28 +0000 |
| commit | bd0d7b53a2acfa7d0bc21604df2a4492b9c53133 (patch) | |
| tree | 8c10a710ecc86810dc5e9dce02a53d2719b6a804 /docs/CodeGenerator.html | |
| parent | 9abd8af71e1516346f43c8e9978b7dba1fa0e939 (diff) | |
| download | llvm-bd0d7b53a2acfa7d0bc21604df2a4492b9c53133.tar.gz llvm-bd0d7b53a2acfa7d0bc21604df2a4492b9c53133.tar.bz2 llvm-bd0d7b53a2acfa7d0bc21604df2a4492b9c53133.tar.xz | |
Fixed my rotten Engrish grammar.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30144 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'docs/CodeGenerator.html')
| -rw-r--r-- | docs/CodeGenerator.html | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/docs/CodeGenerator.html b/docs/CodeGenerator.html index 3e965af279..ea3b5d9598 100644 --- a/docs/CodeGenerator.html +++ b/docs/CodeGenerator.html @@ -1168,9 +1168,9 @@ SelectionDAGs.</p> <p>Live Intervals are the ranges (intervals) where a variable is <i>live</i>. They are used by some <a href="#regalloc">register allocator</a> passes to -determine if two or more virtual registers which require the same register are -live at the same point in the program (conflict). When this situation occurs, -one virtual register must be <i>spilled</i>.</p> +determine if two or more virtual registers which require the same physical +register are live at the same point in the program (i.e., theyconflict). When +this situation occurs, one virtual register must be <i>spilled</i>.</p> </div> @@ -1186,10 +1186,10 @@ calculate the set of registers that are immediately dead after the instruction (i.e., the instruction calculates the value, but it is never used) and the set of registers that are used by the instruction, but are never used after the instruction (i.e., they are killed). Live -variable information is computed for each <i>virtual</i> and +variable information is computed for each <i>virtual</i> register and <i>register allocatable</i> physical register in the function. This is done in a very efficient manner because it uses SSA to sparsely -computer lifetime information for virtual registers (which are in SSA +compute lifetime information for virtual registers (which are in SSA form) and only has to track physical registers within a block. Before register allocation, LLVM can assume that physical registers are only live within a single basic block. This allows it to do a single, @@ -1200,7 +1200,7 @@ a stack pointer or condition codes), it is not tracked.</p> <p>Physical registers may be live in to or out of a function. Live in values are typically arguments in registers. Live out values are typically return values in registers. Live in values are marked as such, and are given a dummy -"defining" instruction during live interval analysis. If the last basic block +"defining" instruction during live intervals analysis. If the last basic block of a function is a <tt>return</tt>, then it's marked as using all live out values in the function.</p> |