https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113429
Bug ID: 113429
Summary: RISC-V: SPEC2017 527 cam4 miscompilation in autovec
VLA build
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: vineetg at gcc dot gnu.org
CC: juzhe.zhong at rivai dot ai, kito.cheng at gmail dot com,
law at gcc dot gnu.org, rdapp at gcc dot gnu.org
Target Milestone: ---
cam4 gets a runtime segv early on due to VSETVLI clobbering a reg (issue
obviously goes away with simple-vsetvl)
00000000002abc76 <__zm_conv_MOD_closure.constprop.0.isra.0>:
...
...
2acebe: mv s2,a5
2acec0: sll a4,s2,0x3
2acec4: li a3,32
2acec8: add a5,sp,224 <--- a5 is some address
on stack
2aceca: bgeu a4,a3,2ad2b6
2acece: li a3,16
2aced0: bgeu a4,a3,2ad294
...
...
2ad294: vsetvli a5,s2,e8,mf4,ta,ma <--- BUG here as a5
clobbered
2ad298: vsetivli zero,8,e8,mf2,ta,ma
2ad29c: add a3,a5,8
2ad2a0: vmv.v.i v1,0
2ad2a4: vse8.v v1,(a5) <--- SEGV
2ad2a8: vse8.v v1,(a3)
2ad2ac: add a4,a4,-16
2ad2ae: li a3,8
2ad2b0: bltu a4,a3,2aceda
2ad2b4: j 2ad282
2ad2b6: vsetivli zero,8,e8,mf2,ta,ma
2ad2ba: add a3,a5,8
2ad2be: vmv.v.i v1,0
2ad2c2: vse8.v v1,(a5)
2ad2c6: vse8.v v1,(a3)
2ad2ca: add a3,a5,16
2ad2ce: vse8.v v1,(a3)
2ad2d2: add a3,a5,24
2ad2d6: vse8.v v1,(a3)
2ad2da: add a4,a4,-32
2ad2dc: li a3,16
2ad2de: bltu a4,a3,2aced4
2ad2e2: j 2ad294
<__zm_conv_MOD_closure.constprop.0.isra.0+0x161e>
