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Vector bitcast support (AArch64 & Interpreter) (#4820)

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* Vector bitcast support (AArch64 & Interpreter)

Implemented support for `bitcast` on vector values for AArch64 and the
interpreter.

Also corrected the verifier to ensure that the size, in bits, of the input and
output types match for a `bitcast`, per the docs.

Copyright (c) 2022 Arm Limited

* `I128` same-type bitcast support

Copyright (c) 2022 Arm Limited

* Directly return input for 64-bit GPR<=>GPR bitcast

Copyright (c) 2022 Arm Limited
This commit is contained in:
Damian Heaton
2022-09-21 17:20:28 +01:00
committed by GitHub
parent 05cbd667c7
commit e786bda002
15 changed files with 478 additions and 26 deletions
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10
cranelift/filetests/filetests/verifier/bitcast.clif
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@@ -1,23 +1,23 @@
test verifier
; bitcast between two types of equal size if ok
; bitcast between two types of equal size is ok
function %valid_bitcast1(i32) -> f32 { ; Ok
block0(v0: i32):
v1 = bitcast.f32 v0
return v1
}
; bitcast to a type larger than the operand is ok
function %valid_bitcast2(i32) -> i64 { ; Ok
; bitcast to a type larger than the operand is not ok
function %valid_bitcast2(i32) -> i64 {
block0(v0: i32):
v1 = bitcast.i64 v0
v1 = bitcast.i64 v0 ; error: The bitcast argument v0 has a lane type of 32 bits, which doesn't match an expected type of 64 bits
return v1
}
; bitcast to a smaller type is not ok
function %bad_bitcast(i64) -> i32 {
block0(v0: i64):
v1 = bitcast.i32 v0 ; error: The bitcast argument v0 doesn't fit in a type of 32 bits
v1 = bitcast.i32 v0 ; error: The bitcast argument v0 has a lane type of 64 bits, which doesn't match an expected type of 32 bits
return v1
}