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target/arm: Vectorize USHL and SSHL

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These instructions shift left or right depending on the sign
of the input, and 7 bits are significant to the shift.  This
requires several masks and selects in addition to the actual
shifts to form the complete answer.

That said, the operation is still a small improvement even for
two 64-bit elements -- 13 vector operations instead of 2 * 7
integer operations.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20200216214232.4230-2-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Richard Henderson 2020-02-16 13:42:29 -08:00 • committed by Peter Maydell
parent 7abc8cabad
commit 87b74e8b6e
6 changed files with 389 additions and 66 deletions
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11
target/arm/helper.h
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@ -303,14 +303,8 @@ DEF_HELPER_2(neon_abd_s16, i32, i32, i32)
DEF_HELPER_2(neon_abd_u32, i32, i32, i32)
DEF_HELPER_2(neon_abd_s32, i32, i32, i32)
DEF_HELPER_2(neon_shl_u8, i32, i32, i32)
DEF_HELPER_2(neon_shl_s8, i32, i32, i32)
DEF_HELPER_2(neon_shl_u16, i32, i32, i32)
DEF_HELPER_2(neon_shl_s16, i32, i32, i32)
DEF_HELPER_2(neon_shl_u32, i32, i32, i32)
DEF_HELPER_2(neon_shl_s32, i32, i32, i32)
DEF_HELPER_2(neon_shl_u64, i64, i64, i64)
DEF_HELPER_2(neon_shl_s64, i64, i64, i64)
DEF_HELPER_2(neon_rshl_u8, i32, i32, i32)
DEF_HELPER_2(neon_rshl_s8, i32, i32, i32)
DEF_HELPER_2(neon_rshl_u16, i32, i32, i32)
@ -697,6 +691,11 @@ DEF_HELPER_FLAGS_2(frint64_s, TCG_CALL_NO_RWG, f32, f32, ptr)
DEF_HELPER_FLAGS_2(frint32_d, TCG_CALL_NO_RWG, f64, f64, ptr)
DEF_HELPER_FLAGS_2(frint64_d, TCG_CALL_NO_RWG, f64, f64, ptr)
DEF_HELPER_FLAGS_4(gvec_sshl_b, TCG_CALL_NO_RWG, void, ptr, ptr, ptr, i32)
DEF_HELPER_FLAGS_4(gvec_sshl_h, TCG_CALL_NO_RWG, void, ptr, ptr, ptr, i32)
DEF_HELPER_FLAGS_4(gvec_ushl_b, TCG_CALL_NO_RWG, void, ptr, ptr, ptr, i32)
DEF_HELPER_FLAGS_4(gvec_ushl_h, TCG_CALL_NO_RWG, void, ptr, ptr, ptr, i32)
#ifdef TARGET_AARCH64
#include "helper-a64.h"
#include "helper-sve.h"