 Lei Huang
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b6988767a8
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[PowerPC] Reduce register pressure by not materializing a constant just for use as an index register for X-Form loads/stores.
For this example:
float test (int *arr) {
return arr[2];
}
We currently generate the following code:
li r4, 8
lxsiwax f0, r3, r4
xscvsxdsp f1, f0
With this patch, we will now generate:
addi r3, r3, 8
lxsiwax f0, 0, r3
xscvsxdsp f1, f0
Originally reported in: https://bugs.llvm.org/show_bug.cgi?id=27204
Differential Revision: https://reviews.llvm.org/D35027
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@307553 91177308-0d34-0410-b5e6-96231b3b80d8
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2017-07-10 16:44:45 +00:00 |
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