================
@@ -4903,16 +4903,40 @@ bool AMDGPULegalizerInfo::legalizeFDIV16(MachineInstr
&MI,
LLT S16 = LLT::scalar(16);
LLT S32 = LLT::scalar(32);
+ // a32.u = opx(V_CVT_F32_F16, a.u); // CVT to F32
+ // b32.u = opx(V_CVT_F32_F16, b.u); // CVT to F32
+ // r32.u = opx(V_RCP_F32, b32.u); // rcp = 1 / d
+ // q32.u = opx(V_MUL_F32, a32.u, r32.u); // q = n * rcp
+ // e32.u = opx(V_MAD_F32, (b32.u^_neg32), q32.u, a32.u); // err = -d * q + n
+ // q32.u = opx(V_MAD_F32, e32.u, r32.u, q32.u); // q = n * rcp
+ // e32.u = opx(V_MAD_F32, (b32.u^_neg32), q32.u, a32.u); // err = -d * q + n
+ // tmp.u = opx(V_MUL_F32, e32.u, r32.u);
+ // tmp.u = opx(V_AND_B32, tmp.u, 0xff800000)
+ // q32.u = opx(V_ADD_F32, tmp.u, q32.u);
+ // q16.u = opx(V_CVT_F16_F32, q32.u);
+ // q16.u = opx(V_DIV_FIXUP_F16, q16.u, b.u, a.u); // q = touchup(q, d, n)
+
auto LHSExt = B.buildFPExt(S32, LHS, Flags);
auto RHSExt = B.buildFPExt(S32, RHS, Flags);
-
- auto RCP = B.buildIntrinsic(Intrinsic::amdgcn_rcp, {S32})
+ auto NegRHSExt = B.buildFNeg(S32, RHSExt);
+ auto Rcp = B.buildIntrinsic(Intrinsic::amdgcn_rcp, {S32})
.addUse(RHSExt.getReg(0))
.setMIFlags(Flags);
-
- auto QUOT = B.buildFMul(S32, LHSExt, RCP, Flags);
- auto RDst = B.buildFPTrunc(S16, QUOT, Flags);
-
+ auto Quot = B.buildFMul(S32, LHSExt, Rcp);
----------------
arsenm wrote:
Lost flags after this point
https://github.com/llvm/llvm-project/pull/109295
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