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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - r283037 causes *** Bad machine code: Illegal virtual register for instruction ***"
href="https://llvm.org/bugs/show_bug.cgi?id=30607">30607</a>
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<th>Summary</th>
<td>r283037 causes *** Bad machine code: Illegal virtual register for instruction ***
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>mikael.holmen@ericsson.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=17399" name="attach_17399" title="Reproducer">attachment 17399</a> <a href="attachment.cgi?id=17399&action=edit" title="Reproducer">[details]</a></span>
Reproducer
Running llc on the attached program makes the verifier complain since commit
r283037 - [X86][SSE] Enable commutation from MOVSD/MOVSS to BLENDPD/BLENDPS on
SSE41+ targets"
So
llc -march=x86-64 -mcpu=corei7 -o /dev/null red.ll -verify-coalescing
gives
# Before register coalescing
********** INTERVALS **********
%vreg0 [16r,176r:0) 0@16r
%vreg1 [32r,224r:0) 0@32r
%vreg2 [48r,192r:0) 0@48r
%vreg3 [176r,192r:0)[192r,208r:1) 0@176r 1@192r
%vreg5 [208r,224r:0)[224r,352r:1) 0@208r 1@224r
%vreg7 [64r,160B:0) 0@64r
%vreg8 EMPTY
%vreg9 [240r,336B:0) 0@240r
%vreg10 [272r,288r:0) 0@272r
%vreg11 EMPTY
RegMasks:
********** MACHINEINSTRS **********
# Machine code for function autogen_SD17701: NoPHIs, TracksLiveness
Constant Pool:
cp#0: 0x58C1C66036BF19DE, align=8
0B BB#0: derived from LLVM BB %BB
16B %vreg0<def> = V_SET0; VR128:%vreg0
32B %vreg1<def> = COPY %vreg0; VR128:%vreg1,%vreg0
48B %vreg2<def> = FsFLD0SD; FR64:%vreg2
64B %vreg7<def> = MOVSDrm %RIP, 1, %noreg, <cp#0>, %noreg;
mem:LD8[ConstantPool] FR64:%vreg7
Successors according to CFG: BB#1(?%)
80B BB#1: derived from LLVM BB %CF248
Predecessors according to CFG: BB#0 BB#1
96B UCOMISDrr %vreg7, %vreg8<undef>, %EFLAGS<imp-def>;
FR64:%vreg7,%vreg8
112B JNE_1 <BB#1>, %EFLAGS<imp-use>
128B JNP_1 <BB#2>, %EFLAGS<imp-use,kill>
144B JMP_1 <BB#1>
Successors according to CFG: BB#1(0x7c000000 / 0x80000000 = 96.88%)
BB#2(0x04000000 / 0x80000000 = 3.12%)
160B BB#2: derived from LLVM BB %CF251
Predecessors according to CFG: BB#1
176B %vreg3<def> = COPY %vreg0; VR128:%vreg3,%vreg0
192B %vreg3<def,tied1> = BLENDPDrri %vreg3<tied0>, %vreg2, 1;
VR128:%vreg3 FR64:%vreg2
208B %vreg5<def> = COPY %vreg3; VR128:%vreg5,%vreg3
224B %vreg5<def,tied1> = UNPCKHPDrr %vreg5<tied0>, %vreg1;
VR128:%vreg5,%vreg1
240B %vreg9<def> = MOV32r0 %EFLAGS<imp-def,dead>; GR32:%vreg9
Successors according to CFG: BB#3(?%)
256B BB#3: derived from LLVM BB %CF265
Predecessors according to CFG: BB#2 BB#3
272B %vreg10<def> = COPY %vreg9:sub_8bit; GR8:%vreg10 GR32:%vreg9
288B TEST8rr %vreg10, %vreg10, %EFLAGS<imp-def>; GR8:%vreg10
304B JNE_1 <BB#3>, %EFLAGS<imp-use,kill>
320B JMP_1 <BB#4>
Successors according to CFG: BB#3(0x7ffff800 / 0x80000000 =
100.00%) BB#4(0x00000800 / 0x80000000 = 0.00%)
336B BB#4: derived from LLVM BB %CF274
Predecessors according to CFG: BB#3
352B MOVHPDmr %vreg11<undef>, 1, %noreg, 0, %noreg, %vreg5;
mem:ST8[undef] GR64:%vreg11 VR128:%vreg5
# End machine code for function autogen_SD17701.
*** Bad machine code: Illegal virtual register for instruction ***
- function: autogen_SD17701
- basic block: BB#2 CF251 (0x2d92358) [160B;256B)
- instruction: 192B %vreg3<def,tied1> = BLENDPDrri
- operand 2: %vreg2
Expected a VR128 register, but got a FR64 register
LLVM ERROR: Found 1 machine code errors.
The input was generated with llvm-stress and then bugpoint reduced.</pre>
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