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[machinst x64]: rename Inst::XmmUninitializedValue and document

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This approach is not the best but avoids an extra instruction; perhaps at some point, as mentioned in https://github.com/bytecodealliance/wasmtime/pull/2248, we will add the extra instruction or refactor things in such a way that this `Inst` variant is unnecessary.
This commit is contained in:
Andrew Brown
2020-10-01 11:39:12 -07:00
parent 3d9f3bf728
commit 16a2538ecd
4 changed files with 26 additions and 16 deletions
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8
cranelift/filetests/filetests/isa/x64/simd-lane-access-compile.clif
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@@ -58,7 +58,7 @@ block0(v0: i8):
v1 = splat.i8x16 v0
return v1
}
; check: fake_def %xmm0
; check: uninit %xmm0
; nextln: pinsrb $$0, %rdi, %xmm0
; nextln: pxor %xmm1, %xmm1
; nextln: pshufb %xmm1, %xmm0
@@ -69,7 +69,7 @@ block0:
v1 = splat.b16x8 v0
return v1
}
; check: fake_def %xmm0
; check: uninit %xmm0
; nextln: pinsrw $$0, %r12, %xmm0
; nextln: pinsrw $$1, %r12, %xmm0
; nextln: pshufd $$0, %xmm0, %xmm0
@@ -79,7 +79,7 @@ block0(v0: i32):
v1 = splat.i32x4 v0
return v1
}
; check: fake_def %xmm0
; check: uninit %xmm0
; nextln: pinsrd $$0, %rdi, %xmm0
; nextln: pshufd $$0, %xmm0, %xmm0
@@ -88,6 +88,6 @@ block0(v0: f64):
v1 = splat.f64x2 v0
return v1
}
; check: fake_def %xmm1
; check: uninit %xmm1
; nextln: movsd %xmm0, %xmm1
; nextln: movlhps %xmm0, %xmm1