12.4 ARMv6 SIMD instruction intrinsics and APSR GE flags

The following table describes the action and operation of the APSR.GE flags for each ARMv6 SIMD instruction intrinsic.

Table 12-4 ARMv6 SIMD instruction intrinsics and APSR GE flags

Intrinsic APSR.GE flag action APSR.GE operation
__sel Reads GE flags

if APSR.GE[0] == 1 then res[7:0] = val1[7:0] else val2[7:0]

if APSR.GE[1] == 1 then res[15:8] = val1[15:8] else val2[15:8]

if APSR.GE[2] == 1 then res[23:16] = val1[23:16] else val2[23:16]

if APSR.GE[3] == 1 then res[31:24] = val1[31:24] else val2[31:24]

__sadd16 Sets or clears GE flags

if sum1 ≥ 0 then APSR.GE[1:0] = 11 else 00

if sum2 ≥ 0 then APSR.GE[3:2] = 11 else 00

__sadd8 Sets or clears GE flags

if sum1 ≥ 0 then APSR.GE[0] = 1 else 0

if sum2 ≥ 0 then APSR.GE[1] = 1 else 0

if sum3 ≥ 0 then APSR.GE[2] = 1 else 0

if sum4 ≥ 0 then APSR.GE[3] = 1 else 0

__sasx Sets or clears GE flags

if diff ≥ 0 then APSR.GE[1:0] = 11 else 00

if sum ≥ 0 then APSR.GE[3:2] = 11 else 00

__ssax Sets or clears GE flags

if sum ≥ 0 then APSR.GE[1:0] = 11 else 00

if diff ≥ 0 then APSR.GE[3:2] = 11 else 00

__ssub16 Sets or clears GE flags

if diff1 ≥ 0 then APSR.GE[1:0] = 11 else 00

if diff2 ≥ 0 then APSR.GE[3:2] = 11 else 00

__ssub8 Sets or clears GE flags

if diff1 ≥ 0 then APSR.GE[0] = 1 else 0

if diff2 ≥ 0 then APSR.GE[1] = 1 else 0

if diff3 ≥ 0 then APSR.GE[2] = 1 else 0

if diff4 ≥ 0 then APSR.GE[3] = 1 else 0

__uadd16 Sets or clears GE flags

if sum1 ≥ 0x10000 then APSR.GE[1:0] = 11 else 00

if sum2 ≥ 0x10000 then APSR.GE[3:2] = 11 else 00

__uadd8 Sets or clears GE flags

if sum1 ≥ 0x100 then APSR.GE[0] = 1 else 0

if sum2 ≥ 0x100 then APSR.GE[1] = 1 else 0

if sum3 ≥ 0x100 then APSR.GE[2] = 1 else 0

if sum4 ≥ 0x100 then APSR.GE[3] = 1 else 0

__uasx Sets or clears GE flags

if diff ≥ 0 then APSR.GE[1:0] = 11 else 00

if sum ≥ 0x10000 then APSR.GE[3:2] = 11 else 00

__usax Sets or clears GE flags

if sum ≥ 0x10000 then APSR.GE[1:0] = 11 else 00

if diff ≥ 0 then APSR.GE[3:2] = 11 else 00

__usub16 Sets or clears GE flags

if diff1 ≥ 0 then APSR.GE[1:0] = 11 else 00

if diff2 ≥ 0 then APSR.GE[3:2] = 11 else 00

__usub8 Sets or clears GE flags

if diff1 ≥ 0 then APSR.GE[0] = 1 else 0

if diff2 ≥ 0 then APSR.GE[1] = 1 else 0

if diff3 ≥ 0 then APSR.GE[2] = 1 else 0

if diff4 ≥ 0 then APSR.GE[3] = 1 else 0

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