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Fix premature taking of branches with RAW data dependencies on the previous instruction

This commit is contained in:
Luke Wren 2021-05-22 10:18:47 +01:00
parent cc6f590f2e
commit 6692c1f26d
1 changed files with 3 additions and 2 deletions
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5
hdl/hazard3_core.v
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@ -546,11 +546,12 @@ wire [W_ADDR-1:0] x_jump_target =
x_trap_enter ? x_trap_addr :
x_taken_jump_target;
// Be careful not to take branches whose comparisons depend on a load result
wire x_jump_req =
x_trap_enter || x_trap_exit ||
d_branchcond == BCOND_ALWAYS ||
d_branchcond == BCOND_ZERO && !x_alu_cmp ||
d_branchcond == BCOND_NZERO && x_alu_cmp;
d_branchcond == BCOND_ZERO && !x_alu_cmp && !x_stall_raw ||
d_branchcond == BCOND_NZERO && x_alu_cmp && !x_stall_raw;
assign f_jump_req = d_jump_req || x_jump_req;
assign f_jump_target = x_jump_target;