https://llvm.org/bugs/show_bug.cgi?id=25684
Bug ID: 25684
Summary: SDAG failure on AVX512BW/AVX512VL
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Backend: X86
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
LLVM fails to select instructions for the following IR on AVX512BW/AVX512VL (OK
on other AVX512 sets):
define void @truncate_v16i16_to_v16i8(<16 x i16> %a) {
%1 = trunc <16 x i16> %a to <16 x i8>
store <16 x i8> %1, <16 x i8>* undef, align 4
ret void
}
The error message on AVX512BW:
.section __TEXT,__text,regular,pure_instructions
LLVM ERROR: Cannot select: t9: ch = store<ST16[undef](align=4), trunc to v16i8>
t0, t2, undef:i64, undef:i64
t2: v16i16,ch = CopyFromReg t0, Register:v16i16 %vreg0
t1: v16i16 = Register %vreg0
t4: i64 = undef
t4: i64 = undef
In function: truncate_v16i16_to_v16i8
The error message on AVX512VL:
.section __TEXT,__text,regular,pure_instructions
LLVM ERROR: Cannot select: t6: ch = store<ST16[undef](align=4)> t0, t10,
undef:i64, undef:i64
t10: v16i8 = X86ISD::VTRUNC t9
t9: v16i32 = X86ISD::VSEXT t2
t2: v16i16,ch = CopyFromReg t0, Register:v16i16 %vreg0
t1: v16i16 = Register %vreg0
t4: i64 = undef
t4: i64 = undef
In function: truncate_v16i16_to_v16i8
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