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authorAleksandar Markovic <aleksandar.markovic@imgtec.com>2016-06-10 11:57:34 +0200
committerLeon Alrae <leon.alrae@imgtec.com>2016-06-24 13:41:46 +0100
commit6be77480052b1a71557081896e7080363a8a2f95 (patch)
tree0f4151e1bbf051be41ce5b9be8cf8b54dcf5e36e /target-mips
parent40bd6dd456e61a36e454fb9dd2cc739b67c224cf (diff)
downloadqemu-arm-6be77480052b1a71557081896e7080363a8a2f95.tar.gz
target-mips: Add abs2008 flavor of <ABS|NEG>.<S|D>
Updated handling of instructions <ABS|NEG>.<S|D>. Note that legacy (pre-abs2008) ABS and NEG instructions are arithmetic (and, therefore, any NaN operand causes signaling invalid operation), while abs2008 ones are non-arithmetic, always and only changing the sign bit, even for NaN-like operands. Details on these instructions are documented in [1] p. 35 and 359. Implementation-wise, abs2008 versions are implemented without helpers, for simplicity and performance sake. [1] "MIPS Architecture For Programmers Volume II-A: The MIPS64 Instruction Set Reference Manual", Imagination Technologies LTD, Revision 6.04, November 13, 2015 Signed-off-by: Thomas Schwinge <thomas@codesourcery.com> Signed-off-by: Maciej W. Rozycki <macro@codesourcery.com> Signed-off-by: Aleksandar Markovic <aleksandar.markovic@imgtec.com> Reviewed-by: Leon Alrae <leon.alrae@imgtec.com> Signed-off-by: Leon Alrae <leon.alrae@imgtec.com>
Diffstat (limited to 'target-mips')
-rw-r--r--target-mips/translate.c26
1 files changed, 22 insertions, 4 deletions
diff --git a/target-mips/translate.c b/target-mips/translate.c
index a1a9f75294..661ca3abbd 100644
--- a/target-mips/translate.c
+++ b/target-mips/translate.c
@@ -1435,6 +1435,7 @@ typedef struct DisasContext {
bool vp;
bool cmgcr;
bool mrp;
+ bool abs2008;
} DisasContext;
enum {
@@ -8890,7 +8891,11 @@ static void gen_farith (DisasContext *ctx, enum fopcode op1,
TCGv_i32 fp0 = tcg_temp_new_i32();
gen_load_fpr32(ctx, fp0, fs);
- gen_helper_float_abs_s(fp0, fp0);
+ if (ctx->abs2008) {
+ tcg_gen_andi_i32(fp0, fp0, 0x7fffffffUL);
+ } else {
+ gen_helper_float_abs_s(fp0, fp0);
+ }
gen_store_fpr32(ctx, fp0, fd);
tcg_temp_free_i32(fp0);
}
@@ -8909,7 +8914,11 @@ static void gen_farith (DisasContext *ctx, enum fopcode op1,
TCGv_i32 fp0 = tcg_temp_new_i32();
gen_load_fpr32(ctx, fp0, fs);
- gen_helper_float_chs_s(fp0, fp0);
+ if (ctx->abs2008) {
+ tcg_gen_xori_i32(fp0, fp0, 1UL << 31);
+ } else {
+ gen_helper_float_chs_s(fp0, fp0);
+ }
gen_store_fpr32(ctx, fp0, fd);
tcg_temp_free_i32(fp0);
}
@@ -9380,7 +9389,11 @@ static void gen_farith (DisasContext *ctx, enum fopcode op1,
TCGv_i64 fp0 = tcg_temp_new_i64();
gen_load_fpr64(ctx, fp0, fs);
- gen_helper_float_abs_d(fp0, fp0);
+ if (ctx->abs2008) {
+ tcg_gen_andi_i64(fp0, fp0, 0x7fffffffffffffffULL);
+ } else {
+ gen_helper_float_abs_d(fp0, fp0);
+ }
gen_store_fpr64(ctx, fp0, fd);
tcg_temp_free_i64(fp0);
}
@@ -9401,7 +9414,11 @@ static void gen_farith (DisasContext *ctx, enum fopcode op1,
TCGv_i64 fp0 = tcg_temp_new_i64();
gen_load_fpr64(ctx, fp0, fs);
- gen_helper_float_chs_d(fp0, fp0);
+ if (ctx->abs2008) {
+ tcg_gen_xori_i64(fp0, fp0, 1ULL << 63);
+ } else {
+ gen_helper_float_chs_d(fp0, fp0);
+ }
gen_store_fpr64(ctx, fp0, fd);
tcg_temp_free_i64(fp0);
}
@@ -19786,6 +19803,7 @@ void gen_intermediate_code(CPUMIPSState *env, struct TranslationBlock *tb)
(env->insn_flags & (INSN_LOONGSON2E | INSN_LOONGSON2F));
ctx.vp = (env->CP0_Config5 >> CP0C5_VP) & 1;
ctx.mrp = (env->CP0_Config5 >> CP0C5_MRP) & 1;
+ ctx.abs2008 = (env->active_fpu.fcr31 >> FCR31_ABS2008) & 1;
restore_cpu_state(env, &ctx);
#ifdef CONFIG_USER_ONLY
ctx.mem_idx = MIPS_HFLAG_UM;