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tcg: correct 32-bit tcg_gen_ld8s_i64 sign-extension 

The version of tcg_gen_ld8s_i64 for 32-bit systems does a load into
the low part of the return value - then attempts a sign extension into
the high part, but wrongly sets the high part to a sign extension of
itself rather than of the low part.  This results in TCG internal
errors from the use of the uninitialized high part (in some GCC tests
of AArch64 NEON shift intrinsics, in particular).  This patch corrects
the sign-extension logic, making it match other functions such as
tcg_gen_ld16s_i64.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Joseph Myers <joseph@codesourcery.com>
Message-Id: <alpine.DEB.2.20.1610272333560.22353@digraph.polyomino.org.uk>
Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Joseph Myers 2016-10-27 23:35:04 +00:00 committed by Richard Henderson
parent a40d4701bc
commit 3ff91d7e85
1 changed files with 1 additions and 1 deletions
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tcg/tcg-op.c
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@ -817,7 +817,7 @@ void tcg_gen_ld8u_i64(TCGv_i64 ret, TCGv_ptr arg2, tcg_target_long offset)
void tcg_gen_ld8s_i64(TCGv_i64 ret, TCGv_ptr arg2, tcg_target_long offset)
{
tcg_gen_ld8s_i32(TCGV_LOW(ret), arg2, offset);
tcg_gen_sari_i32(TCGV_HIGH(ret), TCGV_HIGH(ret), 31);
tcg_gen_sari_i32(TCGV_HIGH(ret), TCGV_LOW(ret), 31);
}
void tcg_gen_ld16u_i64(TCGv_i64 ret, TCGv_ptr arg2, tcg_target_long offset)