http://llvm.org/bugs/show_bug.cgi?id=21575
Bug ID: 21575
Summary: Order of code generated for fastisel is wrong from X86
.td files dealing with VBROADCASTSSZr
Product: new-bugs
Version: unspecified
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
There is an issue in the X86 .td files dealing with VBROADCASTSSZr where the
ordering of the output for code generated for fastisel is wrong.
In X86GenFastISel.inc:
unsigned fastEmit_X86ISD_VBROADCAST_MVT_v4f32_MVT_v16f32_r(unsigned Op0, bool
Op0IsKill) {
return fastEmitInst_r(X86::VBROADCASTSSZr, &X86::VR512RegClass, Op0,
Op0IsKill);
if ((Subtarget->hasAVX512())) {
return fastEmitInst_r(X86::VBROADCASTSSZr, &X86::VR512RegClass, Op0,
Op0IsKill);
}
}
The "bare" return makes the if statement into dead code.
Note that how these are ordered is going to change to be based on the
complexity. But even with that change the above still occurs so the
complexities of those instructions appears to be wrong as well.
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