http://llvm.org/bugs/show_bug.cgi?id=5327
Summary: Systemz backend - verify-machineinstrs error
Product: new-bugs
Version: trunk
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P2
Component: new bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Created an attachment (id=3716)
--> (http://llvm.org/bugs/attachment.cgi?id=3716)
C source
$clang-cc __udivhi3.c -O3 -o - -S -triple=s390x-unknown-unknown -debug
-verify-machineinstrs
(...)
while.body11: 0xa9bbed4, LLVM BB @0xa98ea30, ID#12:
Predecessors according to CFG: 0xa9bb780 (#7) 0xa9bbe88 (#11)
%reg1053<def> = PHI %reg1031, mbb<while.body11,0xa9bbe88>, %reg1052,
mbb<while.body11,0xa9bb780>
JL mbb<while.body11,0xa9bbfc4>, %PSW<imp-use>
Successors according to CFG: 0xa9bbf78 (#13) 0xa9bbfc4 (#14)
(...)
*** Bad machine code: Using an undefined physical register ***
- function: __udivhi3
- basic block: while.body11 0xa9bbed4 (#12)
- instruction: JL mbb<while.body11,0xa9bbfc4>, %PSW<imp-use>
- operand 1: %PSW<imp-use>
fatal error: error in backend: Found 1 machine code errors.
and the final code is:
(...)
jl .LBB1_8
lr %r3, %r5
.LBB1_8:
jl .LBB1_10
lr %r2, %r11
.LBB1_10:
(...)
there is a big problem somewhere... but looking at debug output it's hard for
me to see how basic bloc #12 is created.
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