diff options
Diffstat (limited to 'sim/ppc/altivec.igen')
| -rw-r--r-- | sim/ppc/altivec.igen | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/sim/ppc/altivec.igen b/sim/ppc/altivec.igen index d933f56..3a224cc 100644 --- a/sim/ppc/altivec.igen +++ b/sim/ppc/altivec.igen @@ -1634,12 +1634,17 @@ unsigned32::model-function::altivec_unsigned_saturate_32:signed64 val, int *sat 0.4,6.VS,11.VA,16.VB,21.VC,26.43:VX:av:vperm %VD, %VA, %VB, %VC:Vector Permute int i, who; + /* The permutation vector might have us read into the source vectors + back at positions before the iteration index, so we must latch the + sources to prevent early-clobbering in case the destination vector + is the same as one of them. */ + vreg myvA = (*vA), myvB = (*vB); for (i = 0; i < 16; i++) { who = (*vC).b[AV_BINDEX(i)] & 0x1f; if (who & 0x10) - (*vS).b[AV_BINDEX(i)] = (*vB).b[AV_BINDEX(who & 0xf)]; + (*vS).b[AV_BINDEX(i)] = myvB.b[AV_BINDEX(who & 0xf)]; else - (*vS).b[AV_BINDEX(i)] = (*vA).b[AV_BINDEX(who & 0xf)]; + (*vS).b[AV_BINDEX(i)] = myvA.b[AV_BINDEX(who & 0xf)]; } PPC_INSN_VR(VS_BITMASK, VA_BITMASK | VB_BITMASK | VC_BITMASK); |