https://llvm.org/bugs/show_bug.cgi?id=29125
Bug ID: 29125
Summary: [AArch64] shufflevector with constants uses 4 ext
instructions
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: Backend: AArch64
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
I don't know AArch, but this doesn't look good:
define <4 x float> @goo(<4 x float> %x) {
%shuf = shufflevector <4 x float> %x, <4 x float> <float undef, float 1.0,
float 2.0, float undef>, <4 x i32><i32 0, i32 5, i32 6, i32 3>
ret <4 x float> %shuf
}
$ ./llc -o - min.ll -mtriple=aarch64
adrp x8, .LCPI1_0
ldr q1, [x8, :lo12:.LCPI1_0]
ext v1.16b, v0.16b, v1.16b, #12
ext v0.16b, v1.16b, v0.16b, #4
ext v1.16b, v1.16b, v1.16b, #8
ext v0.16b, v0.16b, v1.16b, #12
ret
--------------------------------------------------------------------------
Should this be 'bsl'?
Or 2 inserts?
fmov s1, #1.00000000
ins v0.s[1], v1.s[0]
fmov s1, #2.00000000
ins v0.s[2], v1.s[0]
ret
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