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Hello world will compile and execute with this patch.
Patch by Reed Kotler.
llvm-svn: 160651
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llvm-svn: 160598
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Test case will be added later when long branch patch is checked in.
llvm-svn: 160597
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the ones that get or set the frame index for the $gp save slot.
Remove the piece of code in MipsFunctionInfo::getGlobalBaseReg() which returns
GP. This function should always return a virtual register.
llvm-svn: 156695
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llvm-svn: 155522
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since they are equivalent.
llvm-svn: 155188
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llvm-svn: 151625
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reserving a physical register ($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
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llvm-svn: 150805
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http://llvm.org/docs/CodingStandards.html#ll_virtual_anch
llvm-svn: 146960
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