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target-sparc: Use cpu_loop_exit_restore from helper_check_ieee_exceptions

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This avoids needing to save state before every FP operation.

Backports commit 02c79d78853f07d519b3272d06e43041eb4a4105 from qemu
This commit is contained in:
Richard Henderson 2018-02-25 19:12:34 -05:00 committed by Lioncash
parent 524e4af5ca
commit 2215ef7e21
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 13 additions and 4 deletions
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17
qemu/target-sparc/fop_helper.c
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@ -19,12 +19,13 @@
#include "qemu/osdep.h"
#include "cpu.h"
#include "exec/exec-all.h"
#include "exec/helper-proto.h"
#define QT0 (env->qt0)
#define QT1 (env->qt1)
target_ulong helper_check_ieee_exceptions(CPUSPARCState *env)
static target_ulong do_check_ieee_exceptions(CPUSPARCState *env, uintptr_t ra)
{
target_ulong status = get_float_exception_flags(&env->fp_status);
target_ulong fsr = env->fsr;
@ -51,12 +52,15 @@ target_ulong helper_check_ieee_exceptions(CPUSPARCState *env)
}
if ((fsr & FSR_CEXC_MASK) & ((fsr & FSR_TEM_MASK) >> 23)) {
CPUState *cs = CPU(sparc_env_get_cpu(env));
/* Unmasked exception, generate a trap. Note that while
the helper is marked as NO_WG, we can get away with
writing to cpu state along the exception path, since
TCG generated code will never see the write. */
env->fsr = fsr | FSR_FTT_IEEE_EXCP;
helper_raise_exception(env, TT_FP_EXCP);
cs->exception_index = TT_FP_EXCP;
cpu_loop_exit_restore(cs, ra);
} else {
/* Accumulate exceptions */
fsr |= (env->fsr & FSR_CEXC_MASK) << 5;
@ -65,6 +69,11 @@ target_ulong helper_check_ieee_exceptions(CPUSPARCState *env)
return fsr;
}
target_ulong helper_check_ieee_exceptions(CPUSPARCState *env)
{
return do_check_ieee_exceptions(env, GETPC());
}
#define F_HELPER(name, p) void helper_f##name##p(CPUSPARCState *env)
#define F_BINOP(name) \
@ -261,7 +270,7 @@ void helper_fsqrtq(CPUSPARCState *env)
ret = glue(size, _compare_quiet)(reg1, reg2, \
&env->fp_status); \
} \
fsr = helper_check_ieee_exceptions(env); \
fsr = do_check_ieee_exceptions(env, GETPC()); \
switch (ret) { \
case float_relation_unordered: \
fsr |= (FSR_FCC1 | FSR_FCC0) << FS; \
@ -292,7 +301,7 @@ void helper_fsqrtq(CPUSPARCState *env)
ret = glue(size, _compare_quiet)(src1, src2, \
&env->fp_status); \
} \
fsr = helper_check_ieee_exceptions(env); \
fsr = do_check_ieee_exceptions(env, GETPC()); \
switch (ret) { \
case float_relation_unordered: \
fsr |= (FSR_FCC1 | FSR_FCC0) << FS; \