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| author | Tom Musta <tommusta@gmail.com> | 2014-04-21 15:55:04 -0500 |
|---|---|---|
| committer | Alexander Graf <agraf@suse.de> | 2014-06-16 13:24:30 +0200 |
| commit | 9024ff40ba79f77b027fb3cbfe584e0005128193 (patch) | |
| tree | 79c71aaa441610050dc1b69b22b80479e0d4b9d7 /target-ppc/dfp_helper.c | |
| parent | 8de6a1cc672d94e6ca793a1a7fcccf48b65b2e89 (diff) | |
| download | qemu-9024ff40ba79f77b027fb3cbfe584e0005128193.tar.gz | |
target-ppc: Introduce DFP Divide
Add emulation of the PowerPC Decimal Floating Point Divide instructions
ddiv[q][.]
Signed-off-by: Tom Musta <tommusta@gmail.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
Diffstat (limited to 'target-ppc/dfp_helper.c')
| -rw-r--r-- | target-ppc/dfp_helper.c | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/target-ppc/dfp_helper.c b/target-ppc/dfp_helper.c index e6c1098e47..2dca9d4b1d 100644 --- a/target-ppc/dfp_helper.c +++ b/target-ppc/dfp_helper.c @@ -229,6 +229,13 @@ static void dfp_check_for_XX(struct PPC_DFP *dfp) } } +static void dfp_check_for_ZX(struct PPC_DFP *dfp) +{ + if (dfp->context.status & DEC_Division_by_zero) { + dfp_set_FPSCR_flag(dfp, FP_ZX, FP_ZE); + } +} + static void dfp_check_for_VXSNAN(struct PPC_DFP *dfp) { if (dfp->context.status & DEC_Invalid_operation) { @@ -271,6 +278,22 @@ static void dfp_check_for_VXIMZ(struct PPC_DFP *dfp) } } +static void dfp_check_for_VXZDZ(struct PPC_DFP *dfp) +{ + if (dfp->context.status & DEC_Division_undefined) { + dfp_set_FPSCR_flag(dfp, FP_VX | FP_VXZDZ, FP_VE); + } +} + +static void dfp_check_for_VXIDI(struct PPC_DFP *dfp) +{ + if (dfp->context.status & DEC_Invalid_operation) { + if (decNumberIsInfinite(&dfp->a) && decNumberIsInfinite(&dfp->b)) { + dfp_set_FPSCR_flag(dfp, FP_VX | FP_VXIDI, FP_VE); + } + } +} + #define DFP_HELPER_TAB(op, dnop, postprocs, size) \ void helper_##op(CPUPPCState *env, uint64_t *t, uint64_t *a, uint64_t *b) \ { \ @@ -325,3 +348,18 @@ static void MUL_PPs(struct PPC_DFP *dfp) DFP_HELPER_TAB(dmul, decNumberMultiply, MUL_PPs, 64) DFP_HELPER_TAB(dmulq, decNumberMultiply, MUL_PPs, 128) + +static void DIV_PPs(struct PPC_DFP *dfp) +{ + dfp_set_FPRF_from_FRT(dfp); + dfp_check_for_OX(dfp); + dfp_check_for_UX(dfp); + dfp_check_for_ZX(dfp); + dfp_check_for_XX(dfp); + dfp_check_for_VXSNAN(dfp); + dfp_check_for_VXZDZ(dfp); + dfp_check_for_VXIDI(dfp); +} + +DFP_HELPER_TAB(ddiv, decNumberDivide, DIV_PPs, 64) +DFP_HELPER_TAB(ddivq, decNumberDivide, DIV_PPs, 128) |