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tcg/arm: Support TCG_COND_TST{EQ,NE}

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Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20231028194522.245170-12-richard.henderson@linaro.org>
[PMD: Split from bigger patch, part 2/2]
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-Id: <20231108145244.72421-2-philmd@linaro.org>
This commit is contained in:
Richard Henderson 2023-11-08 15:52:43 +01:00
parent e67ec08c3d
commit 9f56661410
2 changed files with 29 additions and 2 deletions
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29
tcg/arm/tcg-target.c.inc
View File

@ -1194,7 +1194,27 @@ static void tcg_out_mb(TCGContext *s, TCGArg a0)
static TCGCond tcg_out_cmp(TCGContext *s, TCGCond cond, TCGReg a,
TCGArg b, int b_const)
{
tcg_out_dat_rIN(s, COND_AL, ARITH_CMP, ARITH_CMN, 0, a, b, b_const);
if (!is_tst_cond(cond)) {
tcg_out_dat_rIN(s, COND_AL, ARITH_CMP, ARITH_CMN, 0, a, b, b_const);
return cond;
}
cond = tcg_tst_eqne_cond(cond);
if (b_const) {
int imm12 = encode_imm(b);
/*
* The compare constraints allow rIN, but TST does not support N.
* Be prepared to load the constant into a scratch register.
*/
if (imm12 >= 0) {
tcg_out_dat_imm(s, COND_AL, ARITH_TST, 0, a, imm12);
return cond;
}
tcg_out_movi32(s, COND_AL, TCG_REG_TMP, b);
b = TCG_REG_TMP;
}
tcg_out_dat_reg(s, COND_AL, ARITH_TST, 0, a, b, SHIFT_IMM_LSL(0));
return cond;
}
@ -1225,6 +1245,13 @@ static TCGCond tcg_out_cmp2(TCGContext *s, const TCGArg *args,
tcg_out_dat_rI(s, COND_EQ, ARITH_CMP, 0, al, bl, const_bl);
return cond;
case TCG_COND_TSTEQ:
case TCG_COND_TSTNE:
/* Similar, but with TST instead of CMP. */
tcg_out_dat_rI(s, COND_AL, ARITH_TST, 0, ah, bh, const_bh);
tcg_out_dat_rI(s, COND_EQ, ARITH_TST, 0, al, bl, const_bl);
return tcg_tst_eqne_cond(cond);
case TCG_COND_LT:
case TCG_COND_GE:
/* We perform a double-word subtraction and examine the result.

2
tcg/arm/tcg-target.h
View File

@ -125,7 +125,7 @@ extern bool use_neon_instructions;
#define TCG_TARGET_HAS_qemu_ldst_i128 0
#define TCG_TARGET_HAS_tst 0
#define TCG_TARGET_HAS_tst 1
#define TCG_TARGET_HAS_v64 use_neon_instructions
#define TCG_TARGET_HAS_v128 use_neon_instructions