From: Eddie Hung <eddie@fpgeh.com>
Date: Fri, 19 Jul 2019 16:16:13 +0000 (-0700)
Subject: Use sign_headroom instead
X-Git-Tag: working-ls180~1039^2~325
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=2168568f43984af2d194c0eab74ad73443f7e84c;p=yosys.git

Use sign_headroom instead
---

diff --git a/techlibs/common/mul2dsp.v b/techlibs/common/mul2dsp.v
index 1f4759929..da887d426 100644
--- a/techlibs/common/mul2dsp.v
+++ b/techlibs/common/mul2dsp.v
@@ -108,7 +108,7 @@ module \$__mul_gen (A, B, Y);
 			end
 
 			\$__mul_gen #(
-				.A_SIGNED(0),
+				.A_SIGNED(sign_headroom),
 				.B_SIGNED(B_SIGNED),
 				.A_WIDTH(`DSP_A_MAXWIDTH),
 				.B_WIDTH(B_WIDTH),
@@ -122,7 +122,7 @@ module \$__mul_gen (A, B, Y);
 
 			for (i = 1; i < n-1; i=i+1) begin:slice
 				\$__mul_gen #(
-					.A_SIGNED(0),
+					.A_SIGNED(sign_headroom),
 					.B_SIGNED(B_SIGNED),
 					.A_WIDTH(`DSP_A_MAXWIDTH),
 					.B_WIDTH(B_WIDTH),
@@ -163,7 +163,7 @@ module \$__mul_gen (A, B, Y);
 
 			\$__mul_gen #(
 				.A_SIGNED(A_SIGNED),
-				.B_SIGNED(0),
+				.B_SIGNED(sign_headroom),
 				.A_WIDTH(A_WIDTH),
 				.B_WIDTH(`DSP_B_MAXWIDTH),
 				.Y_WIDTH(partial_Y_WIDTH)
@@ -177,7 +177,7 @@ module \$__mul_gen (A, B, Y);
 			for (i = 1; i < n-1; i=i+1) begin:slice
 				\$__mul_gen #(
 					.A_SIGNED(A_SIGNED),
-					.B_SIGNED(0),
+					.B_SIGNED(sign_headroom),
 					.A_WIDTH(A_WIDTH),
 					.B_WIDTH(`DSP_B_MAXWIDTH),
 					.Y_WIDTH(partial_Y_WIDTH)