https://llvm.org/bugs/show_bug.cgi?id=27204
Bug ID: 27204
Summary: [PPC] Suboptimal code generated for integer load
followed by conversion to floating point
Product: new-bugs
Version: trunk
Hardware: Other
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
This is going to be a bug after I commit this patch:
http://reviews.llvm.org/D18405
I open it to make sure it won't be forgotten.
For this example:
float test (int *arr) {
return arr[2];
}
After submission of the above patch we will generate the following code:
0: 08 00 80 38 li r4,8
4: 98 20 03 7c lxsiwax vs0,r3,r4
8: e0 04 20 f0 xscvsxdsp vs1,vs0
c: 20 00 80 4e blr
We need to generate the code below which has lower register pressure
0: 08 00 63 38 addi r3,r3,8
4: ae 1e 20 7c lfiwax f1,0,r3
8: 9c 0e 20 ec fcfids f1,f1
c: 20 00 80 4e blr
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