* [PATCH v3 1/4] ppc/translate: Fix unordered f64/f128 comparisons
2020-11-12 23:01 [PATCH v3 0/4] ppc/translate: Fix unordered f64/f128 comparisons LemonBoy
@ 2020-11-12 23:01 ` LemonBoy
2020-11-12 23:01 ` [PATCH v3 2/4] ppc/translate: Turn the helper macros into functions LemonBoy
` (3 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: LemonBoy @ 2020-11-12 23:01 UTC (permalink / raw)
To: qemu-devel; +Cc: LemonBoy, richard.henderson, qemu-ppc, david
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
^ permalink raw reply related [flat|nested] 6+ messages in thread* [PATCH v3 2/4] ppc/translate: Turn the helper macros into functions
2020-11-12 23:01 [PATCH v3 0/4] ppc/translate: Fix unordered f64/f128 comparisons LemonBoy
2020-11-12 23:01 ` [PATCH v3 1/4] " LemonBoy
@ 2020-11-12 23:01 ` LemonBoy
2020-11-12 23:01 ` [PATCH v3 3/4] ppc/translate: Delay NaN checking after comparison LemonBoy
` (2 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: LemonBoy @ 2020-11-12 23:01 UTC (permalink / raw)
To: qemu-devel; +Cc: LemonBoy, richard.henderson, qemu-ppc, david
Suggested-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Giuseppe Musacchio <thatlemon@gmail.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
---
target/ppc/fpu_helper.c | 222 ++++++++++++++++++++++------------------
1 file changed, 120 insertions(+), 102 deletions(-)
diff --git a/target/ppc/fpu_helper.c b/target/ppc/fpu_helper.c
index b07ff66375..6600520221 100644
--- a/target/ppc/fpu_helper.c
+++ b/target/ppc/fpu_helper.c
@@ -2467,113 +2467,131 @@ void helper_xscmpexpqp(CPUPPCState *env, uint32_t opcode,
do_float_check_status(env, GETPC());
}
-#define VSX_SCALAR_CMP(op, ordered) \
-void helper_##op(CPUPPCState *env, uint32_t opcode, \
- ppc_vsr_t *xa, ppc_vsr_t *xb) \
-{ \
- uint32_t cc = 0; \
- bool vxsnan_flag = false, vxvc_flag = false; \
- \
- helper_reset_fpstatus(env); \
- \
- if (float64_is_signaling_nan(xa->VsrD(0), &env->fp_status) || \
- float64_is_signaling_nan(xb->VsrD(0), &env->fp_status)) { \
- vxsnan_flag = true; \
- 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)) { \
- if (ordered) { \
- vxvc_flag = true; \
- } \
- } \
- if (vxsnan_flag) { \
- float_invalid_op_vxsnan(env, GETPC()); \
- } \
- if (vxvc_flag) { \
- float_invalid_op_vxvc(env, 0, GETPC()); \
- } \
- \
- switch (float64_compare(xa->VsrD(0), xb->VsrD(0), &env->fp_status)) {\
- case float_relation_less: \
- cc |= CRF_LT; \
- 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; \
- env->fpscr |= cc << FPSCR_FPCC; \
- env->crf[BF(opcode)] = cc; \
- \
- do_float_check_status(env, GETPC()); \
+static inline void do_scalar_cmp(CPUPPCState *env, ppc_vsr_t *xa, ppc_vsr_t *xb,
+ int crf_idx, bool ordered)
+{
+ uint32_t cc;
+ bool vxsnan_flag = false, vxvc_flag = false;
+
+ helper_reset_fpstatus(env);
+
+ if (float64_is_signaling_nan(xa->VsrD(0), &env->fp_status) ||
+ float64_is_signaling_nan(xb->VsrD(0), &env->fp_status)) {
+ vxsnan_flag = true;
+ 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)) {
+ if (ordered) {
+ vxvc_flag = true;
+ }
+ }
+ if (vxsnan_flag) {
+ float_invalid_op_vxsnan(env, GETPC());
+ }
+ if (vxvc_flag) {
+ float_invalid_op_vxvc(env, 0, GETPC());
+ }
+
+ switch (float64_compare(xa->VsrD(0), xb->VsrD(0), &env->fp_status)) {
+ case float_relation_less:
+ cc = CRF_LT;
+ 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;
+ default:
+ g_assert_not_reached();
+ }
+
+ env->fpscr &= ~FP_FPCC;
+ env->fpscr |= cc << FPSCR_FPCC;
+ env->crf[crf_idx] = cc;
+
+ do_float_check_status(env, GETPC());
+}
+
+void helper_xscmpodp(CPUPPCState *env, uint32_t opcode, ppc_vsr_t *xa,
+ ppc_vsr_t *xb)
+{
+ do_scalar_cmp(env, xa, xb, BF(opcode), true);
+}
+
+void helper_xscmpudp(CPUPPCState *env, uint32_t opcode, ppc_vsr_t *xa,
+ ppc_vsr_t *xb)
+{
+ do_scalar_cmp(env, xa, xb, BF(opcode), false);
}
-VSX_SCALAR_CMP(xscmpodp, 1)
-VSX_SCALAR_CMP(xscmpudp, 0)
+static inline void do_scalar_cmpq(CPUPPCState *env, ppc_vsr_t *xa,
+ ppc_vsr_t *xb, int crf_idx, bool ordered)
+{
+ uint32_t cc;
+ bool vxsnan_flag = false, vxvc_flag = false;
+
+ helper_reset_fpstatus(env);
+
+ if (float128_is_signaling_nan(xa->f128, &env->fp_status) ||
+ float128_is_signaling_nan(xb->f128, &env->fp_status)) {
+ vxsnan_flag = true;
+ if (fpscr_ve == 0 && ordered) {
+ vxvc_flag = true;
+ }
+ } else if (float128_is_quiet_nan(xa->f128, &env->fp_status) ||
+ float128_is_quiet_nan(xb->f128, &env->fp_status)) {
+ if (ordered) {
+ vxvc_flag = true;
+ }
+ }
+ if (vxsnan_flag) {
+ float_invalid_op_vxsnan(env, GETPC());
+ }
+ if (vxvc_flag) {
+ float_invalid_op_vxvc(env, 0, GETPC());
+ }
+
+ switch (float128_compare(xa->f128, xb->f128, &env->fp_status)) {
+ case float_relation_less:
+ cc = CRF_LT;
+ 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;
+ default:
+ g_assert_not_reached();
+ }
-#define VSX_SCALAR_CMPQ(op, ordered) \
-void helper_##op(CPUPPCState *env, uint32_t opcode, \
- ppc_vsr_t *xa, ppc_vsr_t *xb) \
-{ \
- uint32_t cc = 0; \
- bool vxsnan_flag = false, vxvc_flag = false; \
- \
- helper_reset_fpstatus(env); \
- \
- if (float128_is_signaling_nan(xa->f128, &env->fp_status) || \
- float128_is_signaling_nan(xb->f128, &env->fp_status)) { \
- vxsnan_flag = true; \
- cc = CRF_SO; \
- if (fpscr_ve == 0 && ordered) { \
- vxvc_flag = true; \
- } \
- } else if (float128_is_quiet_nan(xa->f128, &env->fp_status) || \
- float128_is_quiet_nan(xb->f128, &env->fp_status)) { \
- cc = CRF_SO; \
- if (ordered) { \
- vxvc_flag = true; \
- } \
- } \
- if (vxsnan_flag) { \
- float_invalid_op_vxsnan(env, GETPC()); \
- } \
- if (vxvc_flag) { \
- float_invalid_op_vxvc(env, 0, GETPC()); \
- } \
- \
- switch (float128_compare(xa->f128, xb->f128, &env->fp_status)) { \
- case float_relation_less: \
- cc |= CRF_LT; \
- 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; \
- env->fpscr |= cc << FPSCR_FPCC; \
- env->crf[BF(opcode)] = cc; \
- \
- do_float_check_status(env, GETPC()); \
+ env->fpscr &= ~FP_FPCC;
+ env->fpscr |= cc << FPSCR_FPCC;
+ env->crf[crf_idx] = cc;
+
+ do_float_check_status(env, GETPC());
+}
+
+void helper_xscmpoqp(CPUPPCState *env, uint32_t opcode, ppc_vsr_t *xa,
+ ppc_vsr_t *xb)
+{
+ do_scalar_cmpq(env, xa, xb, BF(opcode), true);
}
-VSX_SCALAR_CMPQ(xscmpoqp, 1)
-VSX_SCALAR_CMPQ(xscmpuqp, 0)
+void helper_xscmpuqp(CPUPPCState *env, uint32_t opcode, ppc_vsr_t *xa,
+ ppc_vsr_t *xb)
+{
+ do_scalar_cmpq(env, xa, xb, BF(opcode), false);
+}
/*
* VSX_MAX_MIN - VSX floating point maximum/minimum
--
2.27.0
^ permalink raw reply related [flat|nested] 6+ messages in thread* [PATCH v3 3/4] ppc/translate: Delay NaN checking after comparison
2020-11-12 23:01 [PATCH v3 0/4] ppc/translate: Fix unordered f64/f128 comparisons LemonBoy
2020-11-12 23:01 ` [PATCH v3 1/4] " LemonBoy
2020-11-12 23:01 ` [PATCH v3 2/4] ppc/translate: Turn the helper macros into functions LemonBoy
@ 2020-11-12 23:01 ` 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
4 siblings, 0 replies; 6+ messages in thread
From: LemonBoy @ 2020-11-12 23:01 UTC (permalink / raw)
To: qemu-devel; +Cc: LemonBoy, richard.henderson, qemu-ppc, david
Since we always perform a comparison between the two operands avoid
checking for NaN unless the result states they're unordered.
Suggested-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Giuseppe Musacchio <thatlemon@gmail.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
---
target/ppc/fpu_helper.c | 80 +++++++++++++++++++++--------------------
1 file changed, 42 insertions(+), 38 deletions(-)
diff --git a/target/ppc/fpu_helper.c b/target/ppc/fpu_helper.c
index 6600520221..08fcaed723 100644
--- a/target/ppc/fpu_helper.c
+++ b/target/ppc/fpu_helper.c
@@ -2475,25 +2475,6 @@ static inline void do_scalar_cmp(CPUPPCState *env, ppc_vsr_t *xa, ppc_vsr_t *xb,
helper_reset_fpstatus(env);
- if (float64_is_signaling_nan(xa->VsrD(0), &env->fp_status) ||
- float64_is_signaling_nan(xb->VsrD(0), &env->fp_status)) {
- vxsnan_flag = true;
- 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)) {
- if (ordered) {
- vxvc_flag = true;
- }
- }
- if (vxsnan_flag) {
- float_invalid_op_vxsnan(env, GETPC());
- }
- if (vxvc_flag) {
- float_invalid_op_vxvc(env, 0, GETPC());
- }
-
switch (float64_compare(xa->VsrD(0), xb->VsrD(0), &env->fp_status)) {
case float_relation_less:
cc = CRF_LT;
@@ -2506,6 +2487,27 @@ static inline void do_scalar_cmp(CPUPPCState *env, ppc_vsr_t *xa, ppc_vsr_t *xb,
break;
case float_relation_unordered:
cc = CRF_SO;
+
+ if (float64_is_signaling_nan(xa->VsrD(0), &env->fp_status) ||
+ float64_is_signaling_nan(xb->VsrD(0), &env->fp_status)) {
+ vxsnan_flag = true;
+ 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)) {
+ if (ordered) {
+ vxvc_flag = true;
+ }
+ }
+
+ if (vxsnan_flag) {
+ float_invalid_op_vxsnan(env, GETPC());
+ }
+ if (vxvc_flag) {
+ float_invalid_op_vxvc(env, 0, GETPC());
+ }
+
break;
default:
g_assert_not_reached();
@@ -2538,25 +2540,6 @@ static inline void do_scalar_cmpq(CPUPPCState *env, ppc_vsr_t *xa,
helper_reset_fpstatus(env);
- if (float128_is_signaling_nan(xa->f128, &env->fp_status) ||
- float128_is_signaling_nan(xb->f128, &env->fp_status)) {
- vxsnan_flag = true;
- if (fpscr_ve == 0 && ordered) {
- vxvc_flag = true;
- }
- } else if (float128_is_quiet_nan(xa->f128, &env->fp_status) ||
- float128_is_quiet_nan(xb->f128, &env->fp_status)) {
- if (ordered) {
- vxvc_flag = true;
- }
- }
- if (vxsnan_flag) {
- float_invalid_op_vxsnan(env, GETPC());
- }
- if (vxvc_flag) {
- float_invalid_op_vxvc(env, 0, GETPC());
- }
-
switch (float128_compare(xa->f128, xb->f128, &env->fp_status)) {
case float_relation_less:
cc = CRF_LT;
@@ -2569,6 +2552,27 @@ static inline void do_scalar_cmpq(CPUPPCState *env, ppc_vsr_t *xa,
break;
case float_relation_unordered:
cc = CRF_SO;
+
+ if (float128_is_signaling_nan(xa->f128, &env->fp_status) ||
+ float128_is_signaling_nan(xb->f128, &env->fp_status)) {
+ vxsnan_flag = true;
+ if (fpscr_ve == 0 && ordered) {
+ vxvc_flag = true;
+ }
+ } else if (float128_is_quiet_nan(xa->f128, &env->fp_status) ||
+ float128_is_quiet_nan(xb->f128, &env->fp_status)) {
+ if (ordered) {
+ vxvc_flag = true;
+ }
+ }
+
+ if (vxsnan_flag) {
+ float_invalid_op_vxsnan(env, GETPC());
+ }
+ if (vxvc_flag) {
+ float_invalid_op_vxvc(env, 0, GETPC());
+ }
+
break;
default:
g_assert_not_reached();
--
2.27.0
^ permalink raw reply related [flat|nested] 6+ messages in thread* [PATCH v3 4/4] ppc/translate: Raise exceptions after setting the cc
2020-11-12 23:01 [PATCH v3 0/4] ppc/translate: Fix unordered f64/f128 comparisons LemonBoy
` (2 preceding siblings ...)
2020-11-12 23:01 ` [PATCH v3 3/4] ppc/translate: Delay NaN checking after comparison LemonBoy
@ 2020-11-12 23:01 ` LemonBoy
2020-11-23 6:08 ` [PATCH v3 0/4] ppc/translate: Fix unordered f64/f128 comparisons David Gibson
4 siblings, 0 replies; 6+ messages in thread
From: LemonBoy @ 2020-11-12 23:01 UTC (permalink / raw)
To: qemu-devel; +Cc: LemonBoy, richard.henderson, qemu-ppc, david
The PowerISA reference states that the comparison operators update the
FPCC, CR and FPSCR and, if VE=1, jump to the exception handler.
Moving the exception-triggering code after the CC update sequence solves
the problem.
Signed-off-by: Giuseppe Musacchio <thatlemon@gmail.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
---
target/ppc/fpu_helper.c | 28 ++++++++++++++--------------
1 file changed, 14 insertions(+), 14 deletions(-)
diff --git a/target/ppc/fpu_helper.c b/target/ppc/fpu_helper.c
index 08fcaed723..033964f3d7 100644
--- a/target/ppc/fpu_helper.c
+++ b/target/ppc/fpu_helper.c
@@ -2501,13 +2501,6 @@ static inline void do_scalar_cmp(CPUPPCState *env, ppc_vsr_t *xa, ppc_vsr_t *xb,
}
}
- if (vxsnan_flag) {
- float_invalid_op_vxsnan(env, GETPC());
- }
- if (vxvc_flag) {
- float_invalid_op_vxvc(env, 0, GETPC());
- }
-
break;
default:
g_assert_not_reached();
@@ -2517,6 +2510,13 @@ static inline void do_scalar_cmp(CPUPPCState *env, ppc_vsr_t *xa, ppc_vsr_t *xb,
env->fpscr |= cc << FPSCR_FPCC;
env->crf[crf_idx] = cc;
+ if (vxsnan_flag) {
+ float_invalid_op_vxsnan(env, GETPC());
+ }
+ if (vxvc_flag) {
+ float_invalid_op_vxvc(env, 0, GETPC());
+ }
+
do_float_check_status(env, GETPC());
}
@@ -2566,13 +2566,6 @@ static inline void do_scalar_cmpq(CPUPPCState *env, ppc_vsr_t *xa,
}
}
- if (vxsnan_flag) {
- float_invalid_op_vxsnan(env, GETPC());
- }
- if (vxvc_flag) {
- float_invalid_op_vxvc(env, 0, GETPC());
- }
-
break;
default:
g_assert_not_reached();
@@ -2582,6 +2575,13 @@ static inline void do_scalar_cmpq(CPUPPCState *env, ppc_vsr_t *xa,
env->fpscr |= cc << FPSCR_FPCC;
env->crf[crf_idx] = cc;
+ if (vxsnan_flag) {
+ float_invalid_op_vxsnan(env, GETPC());
+ }
+ if (vxvc_flag) {
+ float_invalid_op_vxvc(env, 0, GETPC());
+ }
+
do_float_check_status(env, GETPC());
}
--
2.27.0
^ permalink raw reply related [flat|nested] 6+ messages in thread* Re: [PATCH v3 0/4] ppc/translate: Fix unordered f64/f128 comparisons
2020-11-12 23:01 [PATCH v3 0/4] ppc/translate: Fix unordered f64/f128 comparisons LemonBoy
` (3 preceding siblings ...)
2020-11-12 23:01 ` [PATCH v3 4/4] ppc/translate: Raise exceptions after setting the cc LemonBoy
@ 2020-11-23 6:08 ` David Gibson
4 siblings, 0 replies; 6+ messages in thread
From: David Gibson @ 2020-11-23 6:08 UTC (permalink / raw)
To: LemonBoy; +Cc: richard.henderson, qemu-ppc, qemu-devel
[-- Attachment #1: Type: text/plain, Size: 1014 bytes --]
On Fri, Nov 13, 2020 at 12:01:26AM +0100, LemonBoy wrote:
> Fix a couple of problems found in the emulation of f64/f128 comparisons plus
> some minimal self-contained commits to clean-up some code.
Applied to ppc-for-6.0.
As bug fixes, these could theoretically go into qemu-5.2. However,
since they're not regressions, I'm more comfortable delaying these to
6.0 given how late we are in the qemu-5.2 cycle.
>
> Giuseppe Musacchio (4):
> ppc/translate: Fix unordered f64/f128 comparisons
> ppc/translate: Turn the helper macros into functions
> ppc/translate: Delay NaN checking after comparison
> ppc/translate: Raise exceptions after setting the cc
>
> target/ppc/fpu_helper.c | 212 +++++++++++++++++++++++-----------------
> 1 file changed, 121 insertions(+), 91 deletions(-)
>
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
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