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Redesign after being hit with the KISS bat.

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james.brodman
2013-10-23 14:25:43 -04:00
parent f97a2d68c8
commit 4d289b16c2
3 changed files with 92 additions and 129 deletions
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17
builtins/util.m4
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@@ -798,23 +798,6 @@ not_const:
}
define <WIDTH x $1> @__shift_$1(<WIDTH x $1>, i32) nounwind readnone alwaysinline {
%isc = call i1 @__is_compile_time_constant_uniform_int32(i32 %1)
%zeropaddedvec = shufflevector <WIDTH x $1> %0, <WIDTH x $1> zeroinitializer,
<eval(2*WIDTH) x i32> < forloop(i, 0, eval(2*WIDTH-2), `i32 i, ')i32 eval(2*WIDTH-1) >
br i1 %isc, label %is_const, label %not_const
is_const:
; though verbose, this turms into tight code if %1 is a constant
forloop(i, 0, eval(WIDTH-1), `
%delta_`'i = add i32 %1, i
%delta_clamped_`'i = and i32 %delta_`'i, eval(2*WIDTH-1)
%v_`'i = extractelement <eval(2*WIDTH) x $1> %zeropaddedvec, i32 %delta_clamped_`'i')
%ret_0 = insertelement <WIDTH x $1> zeroinitializer, $1 %v_0, i32 0
forloop(i, 1, eval(WIDTH-1), ` %ret_`'i = insertelement <WIDTH x $1> %ret_`'eval(i-1), $1 %v_`'i, i32 i
')
ret <WIDTH x $1> %ret_`'eval(WIDTH-1)
not_const:
%ptr = alloca <WIDTH x $1>, i32 3
%ptr0 = getelementptr <WIDTH x $1> * %ptr, i32 0
store <WIDTH x $1> zeroinitializer, <WIDTH x $1> * %ptr0