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[Qemu-devel] [patch] Fix extlh instruction on Alpha
From: |
Vince Weaver |
Subject: |
[Qemu-devel] [patch] Fix extlh instruction on Alpha |
Date: |
Tue, 4 Aug 2009 23:26:43 -0400 (EDT) |
Hello
The extlh instruction on Alpha currently doesn't work properly.
It's a combination of a cut/paste bug (16 where it should be 32) as well
as a "shift by 64" bug.
Below is a patch that fixes the problem, and attached is a test case that
exhibits the bug. The program should print a 4-char wide sliding window
across the test string; without the patch this fails.
Vince
Signed-off-by: Vince Weaver <address@hidden>
diff --git a/target-alpha/translate.c b/target-alpha/translate.c
index 1fc5119..2a681b0 100644
--- a/target-alpha/translate.c
+++ b/target-alpha/translate.c
@@ -526,14 +526,24 @@ static always_inline void gen_ext_h(void
(*tcg_gen_ext_i64)(TCGv t0, TCGv t1),
else
tcg_gen_mov_i64(cpu_ir[rc], cpu_ir[ra]);
} else {
+ int l1;
TCGv tmp1, tmp2;
tmp1 = tcg_temp_new();
+ l1 = gen_new_label();
+
tcg_gen_andi_i64(tmp1, cpu_ir[rb], 7);
tcg_gen_shli_i64(tmp1, tmp1, 3);
+
+ tcg_gen_mov_i64(cpu_ir[rc], cpu_ir[ra]);
+ tcg_gen_brcondi_i64(TCG_COND_EQ, tmp1, 0, l1);
+
tmp2 = tcg_const_i64(64);
tcg_gen_sub_i64(tmp1, tmp2, tmp1);
tcg_temp_free(tmp2);
tcg_gen_shl_i64(cpu_ir[rc], cpu_ir[ra], tmp1);
+
+ gen_set_label(l1);
+
tcg_temp_free(tmp1);
}
if (tcg_gen_ext_i64)
@@ -1320,7 +1330,7 @@ static always_inline int translate_one (DisasContext
*ctx, uint32_t insn)
break;
case 0x6A:
/* EXTLH */
- gen_ext_h(&tcg_gen_ext16u_i64, ra, rb, rc, islit, lit);
+ gen_ext_h(&tcg_gen_ext32u_i64, ra, rb, rc, islit, lit);
break;
case 0x72:
/* MSKQH */
uldl.s
Description: Text document
uldl
Description: Binary data
- [Qemu-devel] [patch] Fix extlh instruction on Alpha,
Vince Weaver <=