target-ppc: VXSQRT Should Not Be Set for NaNs
The Power ISA square root instructions (fsqrt[s], frsqrte[s]) must set the FPSCR[VXSQRT] flag when operating on a negative value. However, NaNs have no sign and therefore this flag should not be set when operating on one. Change the order of the checks in the helper code. Move the SNaN-to-QNaN macro to the top of the file so that it can be re-used. Signed-off-by: Tom Musta <tommusta@gmail.com> Signed-off-by: Alexander Graf <agraf@suse.de>
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@ -19,6 +19,9 @@
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#include "cpu.h"
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#include "cpu.h"
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#include "exec/helper-proto.h"
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#include "exec/helper-proto.h"
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#define float64_snan_to_qnan(x) ((x) | 0x0008000000000000ULL)
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#define float32_snan_to_qnan(x) ((x) | 0x00400000)
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/*****************************************************************************/
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/*****************************************************************************/
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/* Floating point operations helpers */
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/* Floating point operations helpers */
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uint64_t helper_float32_to_float64(CPUPPCState *env, uint32_t arg)
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uint64_t helper_float32_to_float64(CPUPPCState *env, uint32_t arg)
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@ -920,14 +923,16 @@ uint64_t helper_fsqrt(CPUPPCState *env, uint64_t arg)
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farg.ll = arg;
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farg.ll = arg;
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if (unlikely(float64_is_neg(farg.d) && !float64_is_zero(farg.d))) {
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if (unlikely(float64_is_any_nan(farg.d))) {
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if (unlikely(float64_is_signaling_nan(farg.d))) {
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/* sNaN reciprocal square root */
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fload_invalid_op_excp(env, POWERPC_EXCP_FP_VXSNAN, 1);
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farg.ll = float64_snan_to_qnan(farg.ll);
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}
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} else if (unlikely(float64_is_neg(farg.d) && !float64_is_zero(farg.d))) {
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/* Square root of a negative nonzero number */
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/* Square root of a negative nonzero number */
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farg.ll = fload_invalid_op_excp(env, POWERPC_EXCP_FP_VXSQRT, 1);
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farg.ll = fload_invalid_op_excp(env, POWERPC_EXCP_FP_VXSQRT, 1);
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} else {
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} else {
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if (unlikely(float64_is_signaling_nan(farg.d))) {
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/* sNaN square root */
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fload_invalid_op_excp(env, POWERPC_EXCP_FP_VXSNAN, 1);
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}
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farg.d = float64_sqrt(farg.d, &env->fp_status);
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farg.d = float64_sqrt(farg.d, &env->fp_status);
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}
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}
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return farg.ll;
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return farg.ll;
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@ -974,17 +979,20 @@ uint64_t helper_frsqrte(CPUPPCState *env, uint64_t arg)
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farg.ll = arg;
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farg.ll = arg;
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if (unlikely(float64_is_neg(farg.d) && !float64_is_zero(farg.d))) {
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if (unlikely(float64_is_any_nan(farg.d))) {
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/* Reciprocal square root of a negative nonzero number */
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farg.ll = fload_invalid_op_excp(env, POWERPC_EXCP_FP_VXSQRT, 1);
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} else {
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if (unlikely(float64_is_signaling_nan(farg.d))) {
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if (unlikely(float64_is_signaling_nan(farg.d))) {
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/* sNaN reciprocal square root */
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/* sNaN reciprocal square root */
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fload_invalid_op_excp(env, POWERPC_EXCP_FP_VXSNAN, 1);
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fload_invalid_op_excp(env, POWERPC_EXCP_FP_VXSNAN, 1);
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farg.ll = float64_snan_to_qnan(farg.ll);
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}
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}
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} else if (unlikely(float64_is_neg(farg.d) && !float64_is_zero(farg.d))) {
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/* Reciprocal square root of a negative nonzero number */
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farg.ll = fload_invalid_op_excp(env, POWERPC_EXCP_FP_VXSQRT, 1);
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} else {
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farg.d = float64_sqrt(farg.d, &env->fp_status);
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farg.d = float64_sqrt(farg.d, &env->fp_status);
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farg.d = float64_div(float64_one, farg.d, &env->fp_status);
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farg.d = float64_div(float64_one, farg.d, &env->fp_status);
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}
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}
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return farg.ll;
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return farg.ll;
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}
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}
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@ -2382,9 +2390,6 @@ void helper_##op(CPUPPCState *env, uint32_t opcode) \
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VSX_SCALAR_CMP(xscmpodp, 1)
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VSX_SCALAR_CMP(xscmpodp, 1)
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VSX_SCALAR_CMP(xscmpudp, 0)
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VSX_SCALAR_CMP(xscmpudp, 0)
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#define float64_snan_to_qnan(x) ((x) | 0x0008000000000000ULL)
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#define float32_snan_to_qnan(x) ((x) | 0x00400000)
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/* VSX_MAX_MIN - VSX floating point maximum/minimum
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/* VSX_MAX_MIN - VSX floating point maximum/minimum
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* name - instruction mnemonic
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* name - instruction mnemonic
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* op - operation (max or min)
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* op - operation (max or min)
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