diff --git a/llvm/lib/Target/X86/X86ScheduleZnver1.td b/llvm/lib/Target/X86/X86ScheduleZnver1.td
index 9d11c5ef11aeb..78b32953cdf80 100644
--- a/llvm/lib/Target/X86/X86ScheduleZnver1.td
+++ b/llvm/lib/Target/X86/X86ScheduleZnver1.td
@@ -972,25 +972,6 @@ def : InstRW<[WriteMicrocoded], (instrs FNINIT)>;
 
 //=== Integer MMX and XMM Instructions ===//
 
-// PACKSSWB/DW.
-// mm <- mm.
-def ZnWriteFPU12 : SchedWriteRes<[ZnFPU12]> ;
-def ZnWriteFPU12Y : SchedWriteRes<[ZnFPU12]> {
-  let NumMicroOps = 2;
-}
-def ZnWriteFPU12m : SchedWriteRes<[ZnAGU, ZnFPU12]> ;
-def ZnWriteFPU12Ym : SchedWriteRes<[ZnAGU, ZnFPU12]> {
-  let Latency = 8;
-  let NumMicroOps = 2;
-}
-
-def : InstRW<[ZnWriteFPU12], (instrs MMX_PACKSSDWrr,
-                                     MMX_PACKSSWBrr,
-                                     MMX_PACKUSWBrr)>;
-def : InstRW<[ZnWriteFPU12m], (instrs MMX_PACKSSDWrm,
-                                      MMX_PACKSSWBrm,
-                                      MMX_PACKUSWBrm)>;
-
 def ZnWriteFPU013 : SchedWriteRes<[ZnFPU013]> ;
 def ZnWriteFPU013Y : SchedWriteRes<[ZnFPU013]> {
   let Latency = 2;
diff --git a/llvm/lib/Target/X86/X86ScheduleZnver2.td b/llvm/lib/Target/X86/X86ScheduleZnver2.td
index 7399a4709fab7..d6b0d2dd191a1 100644
--- a/llvm/lib/Target/X86/X86ScheduleZnver2.td
+++ b/llvm/lib/Target/X86/X86ScheduleZnver2.td
@@ -993,26 +993,6 @@ def : InstRW<[WriteMicrocoded], (instrs FNINIT)>;
 
 //=== Integer MMX and XMM Instructions ===//
 
-// PACKSSWB/DW.
-// mm <- mm.
-def Zn2WriteFPU12 : SchedWriteRes<[Zn2FPU12]> ;
-def Zn2WriteFPU12Y : SchedWriteRes<[Zn2FPU12]> {
-  let Latency = 4;
-  let NumMicroOps = 2;
-}
-def Zn2WriteFPU12m : SchedWriteRes<[Zn2AGU, Zn2FPU12]> ;
-def Zn2WriteFPU12Ym : SchedWriteRes<[Zn2AGU, Zn2FPU12]> {
-  let Latency = 8;
-  let NumMicroOps = 2;
-}
-
-def : InstRW<[Zn2WriteFPU12], (instrs MMX_PACKSSDWrr,
-                                     MMX_PACKSSWBrr,
-                                     MMX_PACKUSWBrr)>;
-def : InstRW<[Zn2WriteFPU12m], (instrs MMX_PACKSSDWrm,
-                                      MMX_PACKSSWBrm,
-                                      MMX_PACKUSWBrm)>;
-
 def Zn2WriteFPU013 : SchedWriteRes<[Zn2FPU013]> ;
 def Zn2WriteFPU013Y : SchedWriteRes<[Zn2FPU013]> ;
 def Zn2WriteFPU013m : SchedWriteRes<[Zn2AGU, Zn2FPU013]> {
diff --git a/llvm/test/tools/llvm-mca/X86/Znver1/resources-mmx.s b/llvm/test/tools/llvm-mca/X86/Znver1/resources-mmx.s
index 77508f5be235f..61462105e1b5f 100644
--- a/llvm/test/tools/llvm-mca/X86/Znver1/resources-mmx.s
+++ b/llvm/test/tools/llvm-mca/X86/Znver1/resources-mmx.s
@@ -174,11 +174,11 @@ pxor        (%rax), %mm2
 # CHECK-NEXT:  1      2     1.00                        movq	%mm0, %rcx
 # CHECK-NEXT:  1      1     0.50           *            movq	%mm0, (%rax)
 # CHECK-NEXT:  1      1     0.50                        packsswb	%mm0, %mm2
-# CHECK-NEXT:  1      1     0.50    *                   packsswb	(%rax), %mm2
+# CHECK-NEXT:  1      8     0.50    *                   packsswb	(%rax), %mm2
 # CHECK-NEXT:  1      1     0.50                        packssdw	%mm0, %mm2
-# CHECK-NEXT:  1      1     0.50    *                   packssdw	(%rax), %mm2
+# CHECK-NEXT:  1      8     0.50    *                   packssdw	(%rax), %mm2
 # CHECK-NEXT:  1      1     0.50                        packuswb	%mm0, %mm2
-# CHECK-NEXT:  1      1     0.50    *                   packuswb	(%rax), %mm2
+# CHECK-NEXT:  1      8     0.50    *                   packuswb	(%rax), %mm2
 # CHECK-NEXT:  1      1     0.33                        paddb	%mm0, %mm2
 # CHECK-NEXT:  1      8     0.50    *                   paddb	(%rax), %mm2
 # CHECK-NEXT:  1      1     0.33                        paddd	%mm0, %mm2
diff --git a/llvm/test/tools/llvm-mca/X86/Znver2/resources-mmx.s b/llvm/test/tools/llvm-mca/X86/Znver2/resources-mmx.s
index 96c9351ececfa..492c75f4583e2 100644
--- a/llvm/test/tools/llvm-mca/X86/Znver2/resources-mmx.s
+++ b/llvm/test/tools/llvm-mca/X86/Znver2/resources-mmx.s
@@ -174,11 +174,11 @@ pxor        (%rax), %mm2
 # CHECK-NEXT:  1      2     1.00                        movq	%mm0, %rcx
 # CHECK-NEXT:  1      1     0.33           *            movq	%mm0, (%rax)
 # CHECK-NEXT:  1      1     0.50                        packsswb	%mm0, %mm2
-# CHECK-NEXT:  1      1     0.50    *                   packsswb	(%rax), %mm2
+# CHECK-NEXT:  1      8     0.50    *                   packsswb	(%rax), %mm2
 # CHECK-NEXT:  1      1     0.50                        packssdw	%mm0, %mm2
-# CHECK-NEXT:  1      1     0.50    *                   packssdw	(%rax), %mm2
+# CHECK-NEXT:  1      8     0.50    *                   packssdw	(%rax), %mm2
 # CHECK-NEXT:  1      1     0.50                        packuswb	%mm0, %mm2
-# CHECK-NEXT:  1      1     0.50    *                   packuswb	(%rax), %mm2
+# CHECK-NEXT:  1      8     0.50    *                   packuswb	(%rax), %mm2
 # CHECK-NEXT:  1      1     0.33                        paddb	%mm0, %mm2
 # CHECK-NEXT:  1      8     0.33    *                   paddb	(%rax), %mm2
 # CHECK-NEXT:  1      1     0.33                        paddd	%mm0, %mm2