diff --git a/src/cmd/compile/internal/ssa/gen/AMD64Ops.go b/src/cmd/compile/internal/ssa/gen/AMD64Ops.go
index 09ffd4526f..da5c506064 100644
--- a/src/cmd/compile/internal/ssa/gen/AMD64Ops.go
+++ b/src/cmd/compile/internal/ssa/gen/AMD64Ops.go
@@ -112,7 +112,7 @@ func init() {
 		gp1flags  = regInfo{inputs: []regMask{gpsp}, outputs: flagsonly}
 		flagsgp   = regInfo{inputs: flagsonly, outputs: gponly}
 		readflags = regInfo{inputs: flagsonly, outputs: gponly}
-		flagsgpax = regInfo{inputs: flagsonly, clobbers: ax, outputs: []regMask{gp &^ ax}}
+		flagsgpax = regInfo{inputs: flagsonly, clobbers: ax | flags, outputs: []regMask{gp &^ ax}}
 
 		gpload    = regInfo{inputs: []regMask{gpspsb, 0}, outputs: gponly}
 		gploadidx = regInfo{inputs: []regMask{gpspsb, gpsp, 0}, outputs: gponly}
diff --git a/src/cmd/compile/internal/ssa/opGen.go b/src/cmd/compile/internal/ssa/opGen.go
index 8263268019..82ba4a5449 100644
--- a/src/cmd/compile/internal/ssa/opGen.go
+++ b/src/cmd/compile/internal/ssa/opGen.go
@@ -2502,7 +2502,7 @@ var opcodeTable = [...]opInfo{
 			inputs: []inputInfo{
 				{0, 8589934592}, // .FLAGS
 			},
-			clobbers: 1, // .AX
+			clobbers: 8589934593, // .AX .FLAGS
 			outputs: []regMask{
 				65518, // .CX .DX .BX .BP .SI .DI .R8 .R9 .R10 .R11 .R12 .R13 .R14 .R15
 			},
@@ -2515,7 +2515,7 @@ var opcodeTable = [...]opInfo{
 			inputs: []inputInfo{
 				{0, 8589934592}, // .FLAGS
 			},
-			clobbers: 1, // .AX
+			clobbers: 8589934593, // .AX .FLAGS
 			outputs: []regMask{
 				65518, // .CX .DX .BX .BP .SI .DI .R8 .R9 .R10 .R11 .R12 .R13 .R14 .R15
 			},