maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity

[RISCV] Add tests showing incorrect BUILD_VECTOR lowering 

These tests both use vector constants misidentified as VID sequences.
Because the initial run of elements has a zero step, the elements are
skipped until such a step can be identified. The bug is that the skipped
elements are never validated, even though the computed step is
incompatible across the entire sequence.

A fix will follow in a subseqeuent patch.

Reviewed By: craig.topper

Differential Revision: https://reviews.llvm.org/D123785
This commit is contained in:
Fraser Cormack 2022-04-14 13:03:56 +01:00
parent 7f97ac94f7
commit 00537946aa
1 changed files with 21 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
llvm/test/CodeGen/RISCV/rvv/fixed-vectors-int-buildvec.ll
View File

@ -723,3 +723,24 @@ define <8 x i16> @splat_idx_v8i16(<8 x i16> %v, i64 %idx) {
%splat = shufflevector <8 x i16> %ins, <8 x i16> poison, <8 x i32> zeroinitializer
ret <8 x i16> %splat
}
; FIXME: This is not a vid sequence!
define <4 x i8> @buildvec_not_vid_v4i8_1() {
; CHECK-LABEL: buildvec_not_vid_v4i8_1:
; CHECK: # %bb.0:
; CHECK-NEXT: vsetivli zero, 4, e8, mf4, ta, mu
; CHECK-NEXT: vid.v v8
; CHECK-NEXT: ret
ret <4 x i8> <i8 0, i8 0, i8 2, i8 3>
}
; FIXME: This is not a vid sequence!
define <4 x i8> @buildvec_not_vid_v4i8_2() {
; CHECK-LABEL: buildvec_not_vid_v4i8_2:
; CHECK: # %bb.0:
; CHECK-NEXT: vsetivli zero, 4, e8, mf4, ta, mu
; CHECK-NEXT: vid.v v8
; CHECK-NEXT: vrsub.vi v8, v8, 3
; CHECK-NEXT: ret
ret <4 x i8> <i8 3, i8 3, i8 1, i8 0>
}