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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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25
builtins/target-sse4-8.ll
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@@ -456,3 +456,28 @@ 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 <16 x i8> @__avg_up_uint8(<16 x i8>, <16 x i8>) nounwind readnone {
%r = call <16 x i8> @llvm.x86.sse2.pavg.b(<16 x i8> %0, <16 x i8> %1)
ret <16 x i8> %r
}
declare <8 x i16> @llvm.x86.sse2.pavg.w(<8 x i16>, <8 x i16>) nounwind readnone
define <16 x i16> @__avg_up_uint16(<16 x i16>, <16 x i16>) nounwind readnone {
v16tov8(i16, %0, %a0, %b0)
v16tov8(i16, %1, %a1, %b1)
%r0 = call <8 x i16> @llvm.x86.sse2.pavg.w(<8 x i16> %a0, <8 x i16> %a1)
%r1 = call <8 x i16> @llvm.x86.sse2.pavg.w(<8 x i16> %b0, <8 x i16> %b1)
v8tov16(i16, %r0, %r1, %r)
ret <16 x i16> %r
}
define_avg_up_int8()
define_avg_up_int16()
define_down_avgs()