https://llvm.org/bugs/show_bug.cgi?id=23417
Bug ID: 23417
Summary: Support conditional returns and conditional indirect
calls
Product: libraries
Version: trunk
Hardware: Other
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: SystemZ
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
System z uses an unconditional branch instruction to implement returns
and indirect calls. However, the BRANCH ON CONDITION instruction could
also be used with a condition field, which would allow implementing
*conditional* returns and *conditional* indirect calls (if circumstances
otherwise allow), e.g. from source code like this:
if (cond)
return;
if (cond)
func();
This is not yet implemented.
By adding appropriate instructions to PredicateInstruction and related
routines, the IfConversion pass should be able to detect and optimize
those situations.
--
You are receiving this mail because:
You are on the CC list for the bug.
_______________________________________________
LLVMbugs mailing list
[email protected]
http://lists.cs.uiuc.edu/mailman/listinfo/llvmbugs
