http://llvm.org/bugs/show_bug.cgi?id=18370
Bug ID: 18370
Summary: [thumbv8] insts that sets CPSR are bundled into IT
block mistakenly
Product: new-bugs
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 11812
--> http://llvm.org/bugs/attachment.cgi?id=11812&action=edit
test case
llc < test.ll
emits:
foo:
@ BB#0: @ %entry
mov r1, r0
movs r0, #11
cmp r1, #0
it ne
mulsne r0, r1, r0 ===> incorrrect: it can't set CPSR inside IT
bx lr
Reason:
Thumbv8 requires running Thumb2SizeReduction pass before IfConv to
convert wide 32-bit Thumb2 insts to 16-bit narrow insts becuase wide
insts are not eligible for IT blocks. However, Thumb2SizeReduction may
also set CPSR for converted instrs (e.g. mul -> muls). However, such
insts should not be bundled.
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