llvm-mirror

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History

Akira Hatanaka 3b3ee53886 Add an option to use a virtual register as the global base register instead of

reserving a physical register ($gp or $28) for that purpose.

This will completely eliminate loads that restore the value of $gp after every
function call, if the register allocator assigns a callee-saved register, or
eliminate unnecessary loads if it assigns a temporary register. 

example:

.cpload $25       // set $gp.
...
.cprestore 16     // store $gp to stack slot 16($sp).
...
jalr $25          // function call. clobbers $gp.
lw $gp, 16($sp)   // not emitted if callee-saved reg is chosen.
...
lw $2, 4($gp)
...
jalr $25          // function call.
lw $gp, 16($sp)   // not emitted if $gp is not live after this instruction.
...

llvm-svn: 151402

2012-02-24 22:34:47 +00:00

Analysis

fix PR12075, a regression in a recent transform I added. In unreachable code, gep chains can be infinite. Just like "stripPointerCasts", use a set to keep track of visited instructions so we don't recurse infinitely.

2012-02-24 19:01:58 +00:00

Archive

Avoid using an invalidated iterator.

2012-01-23 05:07:16 +00:00

AsmParser

Convert assert(0) to llvm_unreachable

2012-02-07 05:05:23 +00:00

Bitcode

Enable streaming of bitcode