From: LemonBoy <thatlemon@gmail.com>
To: qemu-devel@nongnu.org
Cc: LemonBoy <thatlemon@gmail.com>,
richard.henderson@linaro.org, qemu-ppc@nongnu.org,
david@gibson.dropbear.id.au
Subject: [PATCH v3 1/4] ppc/translate: Fix unordered f64/f128 comparisons
Date: Fri, 13 Nov 2020 00:01:27 +0100 [thread overview]
Message-ID: <20201112230130.65262-2-thatlemon@gmail.com> (raw)
In-Reply-To: <20201112230130.65262-1-thatlemon@gmail.com>
According to the PowerISA v3.1 reference, Table 68 "Actions for xscmpudp
- Part 1: Compare Unordered", whenever one of the two operands is a NaN
the SO bit is set while the other three bits are cleared.
Apply the same change to xscmpuqp.
The respective ordered counterparts are unaffected.
Signed-off-by: Giuseppe Musacchio <thatlemon@gmail.com>
---
target/ppc/fpu_helper.c | 32 ++++++++++++++++++++++----------
1 file changed, 22 insertions(+), 10 deletions(-)
diff --git a/target/ppc/fpu_helper.c b/target/ppc/fpu_helper.c
index 9b8c8b70b6..b07ff66375 100644
--- a/target/ppc/fpu_helper.c
+++ b/target/ppc/fpu_helper.c
@@ -2479,13 +2479,11 @@ void helper_##op(CPUPPCState *env, uint32_t opcode, \
if (float64_is_signaling_nan(xa->VsrD(0), &env->fp_status) || \
float64_is_signaling_nan(xb->VsrD(0), &env->fp_status)) { \
vxsnan_flag = true; \
- cc = CRF_SO; \
if (fpscr_ve == 0 && ordered) { \
vxvc_flag = true; \
} \
} else if (float64_is_quiet_nan(xa->VsrD(0), &env->fp_status) || \
float64_is_quiet_nan(xb->VsrD(0), &env->fp_status)) { \
- cc = CRF_SO; \
if (ordered) { \
vxvc_flag = true; \
} \
@@ -2497,12 +2495,19 @@ void helper_##op(CPUPPCState *env, uint32_t opcode, \
float_invalid_op_vxvc(env, 0, GETPC()); \
} \
\
- if (float64_lt(xa->VsrD(0), xb->VsrD(0), &env->fp_status)) { \
+ switch (float64_compare(xa->VsrD(0), xb->VsrD(0), &env->fp_status)) {\
+ case float_relation_less: \
cc |= CRF_LT; \
- } else if (!float64_le(xa->VsrD(0), xb->VsrD(0), &env->fp_status)) { \
- cc |= CRF_GT; \
- } else { \
+ break; \
+ case float_relation_equal: \
cc |= CRF_EQ; \
+ break; \
+ case float_relation_greater: \
+ cc |= CRF_GT; \
+ break; \
+ case float_relation_unordered: \
+ cc |= CRF_SO; \
+ break; \
} \
\
env->fpscr &= ~FP_FPCC; \
@@ -2545,12 +2550,19 @@ void helper_##op(CPUPPCState *env, uint32_t opcode, \
float_invalid_op_vxvc(env, 0, GETPC()); \
} \
\
- if (float128_lt(xa->f128, xb->f128, &env->fp_status)) { \
+ switch (float128_compare(xa->f128, xb->f128, &env->fp_status)) { \
+ case float_relation_less: \
cc |= CRF_LT; \
- } else if (!float128_le(xa->f128, xb->f128, &env->fp_status)) { \
- cc |= CRF_GT; \
- } else { \
+ break; \
+ case float_relation_equal: \
cc |= CRF_EQ; \
+ break; \
+ case float_relation_greater: \
+ cc |= CRF_GT; \
+ break; \
+ case float_relation_unordered: \
+ cc |= CRF_SO; \
+ break; \
} \
\
env->fpscr &= ~FP_FPCC; \
--
2.27.0
next prev parent reply other threads:[~2020-11-12 23:03 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-12 23:01 [PATCH v3 0/4] ppc/translate: Fix unordered f64/f128 comparisons LemonBoy
2020-11-12 23:01 ` LemonBoy [this message]
2020-11-12 23:01 ` [PATCH v3 2/4] ppc/translate: Turn the helper macros into functions LemonBoy
2020-11-12 23:01 ` [PATCH v3 3/4] ppc/translate: Delay NaN checking after comparison LemonBoy
2020-11-12 23:01 ` [PATCH v3 4/4] ppc/translate: Raise exceptions after setting the cc LemonBoy
2020-11-23 6:08 ` [PATCH v3 0/4] ppc/translate: Fix unordered f64/f128 comparisons David Gibson
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