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Add avg_{up,down}_int{8,16} routines to stdlib

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These compute the average of two given values, rounding up and down,
respectively, if the result isn't exact.  When possible, these are
mapped to target-specific intrinsics (PADD[BW] on IA and VH[R]ADD[US]
on NEON.)

A subsequent commit will add pattern-matching to generate calls to
these intrinsincs when the corresponding patterns are detected in the
IR.)
This commit is contained in:
Matt Pharr
2013-08-03 20:44:25 -07:00
parent 4f48d3258a
commit 5b20b06bd9
23 changed files with 592 additions and 15 deletions
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31
builtins/target-sse4-16.ll
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@@ -449,3 +449,34 @@ gen_scatter(i32)
gen_scatter(float)
gen_scatter(i64)
gen_scatter(double)
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; int8/int16 builtins
declare <16 x i8> @llvm.x86.sse2.pavg.b(<16 x i8>, <16 x i8>) nounwind readnone
define <8 x i8> @__avg_up_uint8(<8 x i8>, <8 x i8>) {
%v0 = shufflevector <8 x i8> %0, <8 x i8> undef,
<16 x i32> <i32 0, i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7,
i32 undef, i32 undef, i32 undef, i32 undef,
i32 undef, i32 undef, i32 undef, i32 undef>
%v1 = shufflevector <8 x i8> %1, <8 x i8> undef,
<16 x i32> <i32 0, i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7,
i32 undef, i32 undef, i32 undef, i32 undef,
i32 undef, i32 undef, i32 undef, i32 undef>
%r16 = call <16 x i8> @llvm.x86.sse2.pavg.b(<16 x i8> %v0, <16 x i8> %v1)
%r = shufflevector <16 x i8> %r16, <16 x i8> undef,
<8 x i32> <i32 0, i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7>
ret <8 x i8> %r
}
declare <8 x i16> @llvm.x86.sse2.pavg.w(<8 x i16>, <8 x i16>) nounwind readnone
define <8 x i16> @__avg_up_uint16(<8 x i16>, <8 x i16>) {
%r = call <8 x i16> @llvm.x86.sse2.pavg.w(<8 x i16> %0, <8 x i16> %1)
ret <8 x i16> %r
}
define_avg_up_int8()
define_avg_up_int16()
define_down_avgs()